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<!-- Generated by javadoc (1.8.0_151) on Tue Oct 31 17:36:46 EDT 2017 -->
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<title>EntityIndex (Oracle - Berkeley DB Java Edition API)</title>
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<div class="aboutLanguage"><b>Berkeley DB Java Edition</b><br><font size=\"-1\"> version 7.5.11</font>
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<div class="subTitle">com.sleepycat.persist</div>
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<h2 title="Interface EntityIndex" class="title">Interface EntityIndex<K,V></h2>
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<dl>
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<dt>All Known Implementing Classes:</dt>
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<dd><a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist">PrimaryIndex</a>, <a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="class in com.sleepycat.persist">SecondaryIndex</a></dd>
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</dl>
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<hr>
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<br>
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<pre>public interface <span class="typeNameLabel">EntityIndex<K,V></span></pre>
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<div class="block">The interface for accessing keys and entities via a primary or secondary
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index.
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<p><code>EntityIndex</code> objects are thread-safe. Multiple threads may safely
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call the methods of a shared <code>EntityIndex</code> object.</p>
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<p>An index is conceptually a <em>map</em>. {key:value} mappings are
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stored in the index and accessed by key. In fact, for interoperability with
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other libraries that use the standard Java <code>Map</code> or <code>SortedMap</code>
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interfaces, an <code>EntityIndex</code> may be accessed via these standard
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interfaces by calling the <a href="../../../com/sleepycat/persist/EntityIndex.html#map--"><code>map()</code></a> or <a href="../../../com/sleepycat/persist/EntityIndex.html#sortedMap--"><code>sortedMap()</code></a> methods.</p>
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<p><code>EntityIndex</code> is an interface that is implemented by several
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classes in this package for different purposes. Depending on the context,
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the key type (K) and value type (V) of the index take on different meanings.
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The different classes that implement <code>EntityIndex</code> are:</p>
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<ul>
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<li><a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist"><code>PrimaryIndex</code></a> maps primary keys to entities.</li>
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<li><a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="class in com.sleepycat.persist"><code>SecondaryIndex</code></a> maps secondary keys to entities.</li>
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<li><a href="../../../com/sleepycat/persist/SecondaryIndex.html#keysIndex"><code>SecondaryIndex.keysIndex</code></a> maps secondary keys to primary
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keys.</li>
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<li><a href="../../../com/sleepycat/persist/SecondaryIndex.html#subIndex-SK-"><code>SecondaryIndex.subIndex(SK)</code></a> maps primary keys to entities, for the
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subset of entities having a specified secondary key.</li>
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</ul>
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<p>In all cases, the index key type (K) is a primary or secondary key class.
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The index value type (V) is an entity class in all cases except for a <a href="../../../com/sleepycat/persist/SecondaryIndex.html#keysIndex"><code>SecondaryIndex.keysIndex</code></a>, when it is a primary key class.</p>
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<p>In the following example, a <code>Employee</code> entity with a <code>MANY_TO_ONE</code> secondary key is defined.</p>
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<pre class="code">
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@Entity
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class Employee {
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@PrimaryKey
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long id;
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@SecondaryKey(relate=MANY_TO_ONE)
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String department;
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String name;
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private Employee() {}
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}</pre>
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<p>Consider that we have stored the entities below:</p>
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<div><table class="code" border="1" summary="">
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<tr><th colspan="3">Entities</th></tr>
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<tr><th>ID</th><th>Department</th><th>Name</th></tr>
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<tr><td>1</td><td>Engineering</td><td>Jane Smith</td></tr>
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<tr><td>2</td><td>Sales</td><td>Joan Smith</td></tr>
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<tr><td>3</td><td>Engineering</td><td>John Smith</td></tr>
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<tr><td>4</td><td>Sales</td><td>Jim Smith</td></tr>
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</table></div>
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<p><a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist"><code>PrimaryIndex</code></a> maps primary keys to entities:</p>
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<pre class="code">
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<code>PrimaryIndex<Long, Employee></code> primaryIndex =
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store.getPrimaryIndex(Long.class, Employee.class);</pre>
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<div><table class="code" border="1" summary="">
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<tr><th colspan="4">primaryIndex</th></tr>
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<tr><th>Primary Key</th><th colspan="3">Entity</th></tr>
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<tr><td>1</td><td>1</td><td>Engineering</td><td>Jane Smith</td></tr>
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<tr><td>2</td><td>2</td><td>Sales</td><td>Joan Smith</td></tr>
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<tr><td>3</td><td>3</td><td>Engineering</td><td>John Smith</td></tr>
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<tr><td>4</td><td>4</td><td>Sales</td><td>Jim Smith</td></tr>
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</table></div>
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<p><a href="../../../com/sleepycat/persist/SecondaryIndex.html" title="class in com.sleepycat.persist"><code>SecondaryIndex</code></a> maps secondary keys to entities:</p>
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|
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<pre class="code">
|
||
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<code>SecondaryIndex<String, Long, Employee></code> secondaryIndex =
|
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store.getSecondaryIndex(primaryIndex, String.class, "department");</pre>
|
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<div><table class="code" border="1" summary="">
|
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<tr><th colspan="4">secondaryIndex</th></tr>
|
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<tr><th>Secondary Key</th><th colspan="3">Entity</th></tr>
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||
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<tr><td>Engineering</td><td>1</td><td>Engineering</td><td>Jane Smith</td></tr>
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<tr><td>Engineering</td><td>3</td><td>Engineering</td><td>John Smith</td></tr>
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<tr><td>Sales</td><td>2</td><td>Sales</td><td>Joan Smith</td></tr>
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<tr><td>Sales</td><td>4</td><td>Sales</td><td>Jim Smith</td></tr>
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</table></div>
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|
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<p><a href="../../../com/sleepycat/persist/SecondaryIndex.html#keysIndex"><code>SecondaryIndex.keysIndex</code></a> maps secondary keys to primary
|
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keys:</p>
|
||
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|
||
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<pre class="code">
|
||
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<code>EntityIndex<String, Long></code> keysIndex = secondaryIndex.keysIndex();</pre>
|
||
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|
||
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<div><table class="code" border="1" summary="">
|
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<tr><th colspan="4">keysIndex</th></tr>
|
||
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<tr><th>Secondary Key</th><th colspan="3">Primary Key</th></tr>
|
||
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<tr><td>Engineering</td><td>1</td></tr>
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||
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<tr><td>Engineering</td><td>3</td></tr>
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||
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<tr><td>Sales</td><td>2</td></tr>
|
||
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<tr><td>Sales</td><td>4</td></tr>
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||
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</table></div>
|
||
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|
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<p><a href="../../../com/sleepycat/persist/SecondaryIndex.html#subIndex-SK-"><code>SecondaryIndex.subIndex(SK)</code></a> maps primary keys to entities, for the
|
||
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subset of entities having a specified secondary key:</p>
|
||
|
|
|
||
|
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<pre class="code">
|
||
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<code>EntityIndex<Long, Entity></code> subIndex = secondaryIndex.subIndex("Engineering");</pre>
|
||
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|
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<div><table class="code" border="1" summary="">
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<tr><th colspan="4">subIndex</th></tr>
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<tr><th>Primary Key</th><th colspan="3">Entity</th></tr>
|
||
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<tr><td>1</td><td>1</td><td>Engineering</td><td>Jane Smith</td></tr>
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<tr><td>3</td><td>3</td><td>Engineering</td><td>John Smith</td></tr>
|
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</table></div>
|
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|
||
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<h3>Accessing the Index</h3>
|
||
|
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|
||
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<p>An <code>EntityIndex</code> provides a variety of methods for retrieving
|
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entities from an index. It also provides methods for deleting entities.
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However, it does not provide methods for inserting and updating. To insert
|
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and update entities, use the <a href="../../../com/sleepycat/persist/PrimaryIndex.html#put-E-"><code>PrimaryIndex.put(E)</code></a> family of methods in
|
||
|
|
the <a href="../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist"><code>PrimaryIndex</code></a> class.</p>
|
||
|
|
|
||
|
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<p>An <code>EntityIndex</code> supports two mechanisms for retrieving
|
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entities:</p>
|
||
|
|
<ol>
|
||
|
|
<li>The <a href="../../../com/sleepycat/persist/EntityIndex.html#get-K-"><code>get(K)</code></a> method returns a single value for a given key. If there
|
||
|
|
are multiple values with the same secondary key (duplicates), it returns the
|
||
|
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first entity in the duplicate set.</li>
|
||
|
|
<li>An <a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist"><code>EntityCursor</code></a> can be obtained using the <a href="../../../com/sleepycat/persist/EntityIndex.html#keys--"><code>keys()</code></a> and
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html#entities--"><code>entities()</code></a> family of methods. A cursor can be used to return all
|
||
|
|
values in the index, including duplicates. A cursor can also be used to
|
||
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|
return values within a specified range of keys.</li>
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
<p>Using the example entities above, calling <a href="../../../com/sleepycat/persist/EntityIndex.html#get-K-"><code>get(K)</code></a> on the primary
|
||
|
|
index will always return the employee with the given ID, or null if no such
|
||
|
|
ID exists. But calling <a href="../../../com/sleepycat/persist/EntityIndex.html#get-K-"><code>get(K)</code></a> on the secondary index will retrieve
|
||
|
|
the first employee in the given department, which may not be very
|
||
|
|
useful:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
Employee emp = primaryIndex.get(1); // Returns by unique ID
|
||
|
|
emp = secondaryIndex.get("Engineering"); // Returns first in department</pre>
|
||
|
|
|
||
|
|
<p>Using a cursor, you can iterate through all duplicates in the secondary
|
||
|
|
index:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
<code>EntityCursor<Employee></code> cursor = secondaryIndex.entities();
|
||
|
|
try {
|
||
|
|
for (Employee entity : cursor) {
|
||
|
|
if (entity.department.equals("Engineering")) {
|
||
|
|
// Do something with the entity...
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} finally {
|
||
|
|
cursor.close();
|
||
|
|
}</pre>
|
||
|
|
|
||
|
|
<p>But for a large database it is much more efficient to iterate over only
|
||
|
|
those entities with the secondary key you're searching for. This could be
|
||
|
|
done by restricting a cursor to a range of keys:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
<code>EntityCursor<Employee></code> cursor =
|
||
|
|
secondaryIndex.entities("Engineering", true, "Engineering", true);
|
||
|
|
try {
|
||
|
|
for (Employee entity : cursor) {
|
||
|
|
// Do something with the entity...
|
||
|
|
}
|
||
|
|
} finally {
|
||
|
|
cursor.close();
|
||
|
|
}</pre>
|
||
|
|
|
||
|
|
<p>However, when you are interested only in the entities with a particular
|
||
|
|
secondary key value, it is more convenient to use a sub-index:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
<code>EntityIndex<Long, Entity></code> subIndex = secondaryIndex.subIndex("Engineering");
|
||
|
|
<code>EntityCursor<Employee></code> cursor = subIndex.entities();
|
||
|
|
try {
|
||
|
|
for (Employee entity : cursor) {
|
||
|
|
// Do something with the entity...
|
||
|
|
}
|
||
|
|
} finally {
|
||
|
|
cursor.close();
|
||
|
|
}</pre>
|
||
|
|
|
||
|
|
<p>In addition to being more convenient than a cursor range, a sub-index
|
||
|
|
allows retrieving by primary key:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
Employee emp = subIndex.get(1);</pre>
|
||
|
|
|
||
|
|
<p>When using a sub-index, all operations performed on the sub-index are
|
||
|
|
restricted to the single key that was specified when the sub-index was
|
||
|
|
created. For example, the following returns null because employee 2 is not
|
||
|
|
in the Engineering department and therefore is not part of the
|
||
|
|
sub-index:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
Employee emp = subIndex.get(2);</pre>
|
||
|
|
|
||
|
|
<p>For more information on using cursors and cursor ranges, see <a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist"><code>EntityCursor</code></a>.</p>
|
||
|
|
|
||
|
|
<p>Note that when using an index, keys and values are stored and retrieved
|
||
|
|
by value not by reference. In other words, if an entity object is stored
|
||
|
|
and then retrieved, or retrieved twice, each object will be a separate
|
||
|
|
instance. For example, in the code below the assertion will always
|
||
|
|
fail.</p>
|
||
|
|
<pre class="code">
|
||
|
|
MyKey key = ...;
|
||
|
|
MyEntity entity1 = index.get(key);
|
||
|
|
MyEntity entity2 = index.get(key);
|
||
|
|
assert entity1 == entity2; // always fails!
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<h3>Deleting from the Index</h3>
|
||
|
|
|
||
|
|
<p>Any type of index may be used to delete entities with a specified key by
|
||
|
|
calling <a href="../../../com/sleepycat/persist/EntityIndex.html#delete-K-"><code>delete(K)</code></a>. The important thing to keep in mind is that
|
||
|
|
<em>all entities</em> with the specified key are deleted. In a primary index,
|
||
|
|
at most a single entity is deleted:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
primaryIndex.delete(1); // Deletes a single employee by unique ID</pre>
|
||
|
|
|
||
|
|
<p>But in a secondary index, multiple entities may be deleted:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
secondaryIndex.delete("Engineering"); // Deletes all Engineering employees</pre>
|
||
|
|
|
||
|
|
<p>This begs this question: How can a single entity be deleted without
|
||
|
|
knowing its primary key? The answer is to use cursors. After locating an
|
||
|
|
entity using a cursor, the entity can be deleted by calling <a href="../../../com/sleepycat/persist/EntityCursor.html#delete--"><code>EntityCursor.delete()</code></a>.</p>
|
||
|
|
|
||
|
|
<h3>Transactions</h3>
|
||
|
|
|
||
|
|
<p>Transactions can be used to provide standard ACID (Atomicity,
|
||
|
|
Consistency, Integrity and Durability) guarantees when retrieving, storing
|
||
|
|
and deleting entities. This section provides a brief overview of how to use
|
||
|
|
transactions with the Direct Persistence Layer. For more information on
|
||
|
|
using transactions, see <a
|
||
|
|
href="../../../../TransactionGettingStarted/index.html">Writing
|
||
|
|
Transactional Applications</a>.</p>
|
||
|
|
|
||
|
|
<p>Transactions may be used only with a transactional <a href="../../../com/sleepycat/persist/EntityStore.html" title="class in com.sleepycat.persist"><code>EntityStore</code></a>,
|
||
|
|
which is one for which <a href="../../../com/sleepycat/persist/StoreConfig.html#setTransactional-boolean-"><code>StoreConfig.setTransactional(true)</code></a> has been called. Likewise, a
|
||
|
|
transactional store may only be used with a transactional <a href="../../../com/sleepycat/je/Environment.html" title="class in com.sleepycat.je"><code>Environment</code></a>, which is one for which <a href="../../../com/sleepycat/je/EnvironmentConfig.html#setTransactional-boolean-"><code>EnvironmentConfig.setTransactional(true)</code></a>
|
||
|
|
has been called. For example:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
EnvironmentConfig envConfig = new EnvironmentConfig();
|
||
|
|
envConfig.setTransactional(true);
|
||
|
|
envConfig.setAllowCreate(true);
|
||
|
|
Environment env = new Environment(new File("/my/data"), envConfig);
|
||
|
|
|
||
|
|
StoreConfig storeConfig = new StoreConfig();
|
||
|
|
storeConfig.setTransactional(true);
|
||
|
|
storeConfig.setAllowCreate(true);
|
||
|
|
EntityStore store = new EntityStore(env, "myStore", storeConfig);</pre>
|
||
|
|
|
||
|
|
<p>Transactions are represented by <a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je"><code>Transaction</code></a> objects, which are
|
||
|
|
part of the <a href="../../../com/sleepycat/je/package-summary.html"><code>Base API</code></a>. Transactions are created
|
||
|
|
using the <a href="../../../com/sleepycat/je/Environment.html#beginTransaction-com.sleepycat.je.Transaction-com.sleepycat.je.TransactionConfig-"><code>Environment.beginTransaction</code></a>
|
||
|
|
method.</p>
|
||
|
|
|
||
|
|
<p>A transaction will include all operations for which the transaction
|
||
|
|
object is passed as a method argument. All retrieval, storage and deletion
|
||
|
|
methods have an optional <a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je"><code>Transaction</code></a> parameter for this purpose.
|
||
|
|
When a transaction is passed to a method that opens a cursor, all retrieval,
|
||
|
|
storage and deletion operations performed using that cursor will be included
|
||
|
|
in the transaction.</p>
|
||
|
|
|
||
|
|
<p>A transaction may be committed by calling <a href="../../../com/sleepycat/je/Transaction.html#commit--"><code>Transaction.commit()</code></a> or
|
||
|
|
aborted by calling <a href="../../../com/sleepycat/je/Transaction.html#abort--"><code>Transaction.abort()</code></a>. For example, two employees
|
||
|
|
may be deleted atomically with a transaction; other words, either both are
|
||
|
|
deleted or neither is deleted:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
Transaction txn = env.beginTransaction(null, null);
|
||
|
|
try {
|
||
|
|
primaryIndex.delete(txn, 1);
|
||
|
|
primaryIndex.delete(txn, 2);
|
||
|
|
txn.commit();
|
||
|
|
txn = null;
|
||
|
|
} finally {
|
||
|
|
if (txn != null) {
|
||
|
|
txn.abort();
|
||
|
|
}
|
||
|
|
}</pre>
|
||
|
|
|
||
|
|
<p><em>WARNING:</em> Transactions must always be committed or aborted to
|
||
|
|
prevent resource leaks which could lead to the index becoming unusable or
|
||
|
|
cause an <code>OutOfMemoryError</code>. To ensure that a transaction is
|
||
|
|
aborted in the face of exceptions, call <a href="../../../com/sleepycat/je/Transaction.html#abort--"><code>Transaction.abort()</code></a> in a
|
||
|
|
finally block.</p>
|
||
|
|
|
||
|
|
<p>For a transactional store, storage and deletion operations are always
|
||
|
|
transaction protected, whether or not a transaction is explicitly used. A
|
||
|
|
null transaction argument means to perform the operation using auto-commit,
|
||
|
|
or the implied thread transaction if an XAEnvironment is being used. A
|
||
|
|
transaction is automatically started as part of the operation and is
|
||
|
|
automatically committed if the operation completes successfully. The
|
||
|
|
transaction is automatically aborted if an exception occurs during the
|
||
|
|
operation, and the exception is re-thrown to the caller. For example, each
|
||
|
|
employee is deleted using a an auto-commit transaction below, but it is
|
||
|
|
possible that employee 1 will be deleted and employee 2 will not be deleted,
|
||
|
|
if an error or crash occurs while deleting employee 2:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
primaryIndex.delete(null, 1);
|
||
|
|
primaryIndex.delete(null, 2);</pre>
|
||
|
|
|
||
|
|
<p>When retrieving entities, a null transaction argument means to perform
|
||
|
|
the operation non-transactionally. The operation is performed outside the
|
||
|
|
scope of any transaction, without providing transactional ACID guarantees.
|
||
|
|
If an implied thread transaction is present (i.e. if an XAEnvironment is
|
||
|
|
being used), that transaction is used. When a non-transactional store is
|
||
|
|
used, transactional ACID guarantees are also not provided.</p>
|
||
|
|
|
||
|
|
<p>For non-transactional and auto-commit usage, overloaded signatures for
|
||
|
|
retrieval, storage and deletion methods are provided to avoid having to pass
|
||
|
|
a null transaction argument. For example, <a href="../../../com/sleepycat/persist/EntityIndex.html#delete-K-"><code>delete(K)</code></a> may be called
|
||
|
|
instead of <a href="../../../com/sleepycat/persist/EntityIndex.html#delete-com.sleepycat.je.Transaction-K-"><code>delete(Transaction,Object)</code></a>. For example, the following
|
||
|
|
code is equivalent to the code above where null was passed for the
|
||
|
|
transaction:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
primaryIndex.delete(1);
|
||
|
|
primaryIndex.delete(2);</pre>
|
||
|
|
|
||
|
|
<p>For retrieval methods the overloaded signatures also include an optional
|
||
|
|
<a href="../../../com/sleepycat/je/LockMode.html" title="enum in com.sleepycat.je"><code>LockMode</code></a> parameter, and overloaded signatures for opening cursors
|
||
|
|
include an optional <a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je"><code>CursorConfig</code></a> parameter. These parameters are
|
||
|
|
described further below in the Locking and Lock Modes section.</p>
|
||
|
|
|
||
|
|
<h3>Transactions and Cursors</h3>
|
||
|
|
|
||
|
|
<p>There are two special consideration when using cursors with transactions.
|
||
|
|
First, for a transactional store, a non-null transaction must be passed to
|
||
|
|
methods that open a cursor if that cursor will be used to delete or update
|
||
|
|
entities. Cursors do not perform auto-commit when a null transaction is
|
||
|
|
explicitly passed or implied by the method signature. For example, the
|
||
|
|
following code will throw <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je"><code>DatabaseException</code></a> when the <a href="../../../com/sleepycat/persist/EntityCursor.html#delete--"><code>EntityCursor.delete()</code></a> method is called:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
// <strong>Does not work with a transactional store!</strong>
|
||
|
|
<code>EntityCursor<Employee></code> cursor = primaryIndex.entities();
|
||
|
|
try {
|
||
|
|
for (Employee entity : cursor) {
|
||
|
|
cursor.delete(); // <strong>Will throw DatabaseException.</strong>
|
||
|
|
}
|
||
|
|
} finally {
|
||
|
|
cursor.close();
|
||
|
|
}</pre>
|
||
|
|
|
||
|
|
<p>Instead, the <a href="../../../com/sleepycat/persist/EntityIndex.html#entities-com.sleepycat.je.Transaction-com.sleepycat.je.CursorConfig-"><code>entities(Transaction,CursorConfig)</code></a> signature must
|
||
|
|
be used and a non-null transaction must be passed:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
<code>EntityCursor<Employee></code> cursor = primaryIndex.entities(txn, null);
|
||
|
|
try {
|
||
|
|
for (Employee entity : cursor) {
|
||
|
|
cursor.delete();
|
||
|
|
}
|
||
|
|
} finally {
|
||
|
|
cursor.close();
|
||
|
|
}</pre>
|
||
|
|
|
||
|
|
<p>The second consideration is that error handling is more complex when
|
||
|
|
using both transactions and cursors, for the following reasons:</p>
|
||
|
|
<ol>
|
||
|
|
<li>When an exception occurs, the transaction should be aborted.</li>
|
||
|
|
<li>Cursors must be closed whether or not an exception occurs.</li>
|
||
|
|
<li>Cursors must be closed before committing or aborting the
|
||
|
|
transaction.</li>
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
<p>For example:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
Transaction txn = env.beginTransaction(null, null);
|
||
|
|
<code>EntityCursor<Employee></code> cursor = null;
|
||
|
|
try {
|
||
|
|
cursor = primaryIndex.entities(txn, null);
|
||
|
|
for (Employee entity : cursor) {
|
||
|
|
cursor.delete();
|
||
|
|
}
|
||
|
|
cursor.close();
|
||
|
|
cursor = null;
|
||
|
|
txn.commit();
|
||
|
|
txn = null;
|
||
|
|
} finally {
|
||
|
|
if (cursor != null) {
|
||
|
|
cursor.close();
|
||
|
|
}
|
||
|
|
if (txn != null) {
|
||
|
|
txn.abort();
|
||
|
|
}
|
||
|
|
}</pre>
|
||
|
|
|
||
|
|
<h3>Locking and Lock Modes</h3>
|
||
|
|
|
||
|
|
<p>This section provides a brief overview of locking and describes how lock
|
||
|
|
modes are used with the Direct Persistence Layer. For more information on
|
||
|
|
locking, see <a
|
||
|
|
href="../../../../TransactionGettingStarted/index.html">Writing
|
||
|
|
Transactional Applications</a>.</p>
|
||
|
|
|
||
|
|
<p>When using transactions, locks are normally acquired on each entity that
|
||
|
|
is retrieved or stored. The locks are used to isolate one transaction from
|
||
|
|
another. Locks are normally released only when the transaction is committed
|
||
|
|
or aborted.</p>
|
||
|
|
|
||
|
|
<p>When not using transactions, locks are also normally acquired on each
|
||
|
|
entity that is retrieved or stored. However, these locks are released when
|
||
|
|
the operation is complete. When using cursors, in order to provide
|
||
|
|
<em>cursor stability</em> locks are held until the cursor is moved to a
|
||
|
|
different entity or closed.</p>
|
||
|
|
|
||
|
|
<p>This default locking behavior provides full transactional ACID guarantees
|
||
|
|
and cursor stability. However, application performance can sometimes be
|
||
|
|
improved by compromising these guarantees. As described in <a
|
||
|
|
href="../../../../TransactionGettingStarted/index.html">Writing
|
||
|
|
Transactional Applications</a>, the <a href="../../../com/sleepycat/je/LockMode.html" title="enum in com.sleepycat.je"><code>LockMode</code></a> and <a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je"><code>CursorConfig</code></a> parameters are two of the mechanisms that can be used to make
|
||
|
|
compromises.</p>
|
||
|
|
|
||
|
|
<p>For example, imagine that you need an approximate count of all entities
|
||
|
|
matching certain criterion, and it is acceptable for entities to be changed
|
||
|
|
by other threads or other transactions while performing this query. <a href="../../../com/sleepycat/je/LockMode.html#READ_UNCOMMITTED"><code>LockMode.READ_UNCOMMITTED</code></a> can be used to perform the retrievals without
|
||
|
|
acquiring any locks. This reduces memory consumption, does less processing,
|
||
|
|
and improves concurrency.</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
<code>EntityCursor<Employee></code> cursor = primaryIndex.entities(txn, null);
|
||
|
|
try {
|
||
|
|
Employee entity;
|
||
|
|
while ((entity = cursor.next(LockMode.READ_UNCOMMITTED)) != null) {
|
||
|
|
// Examine the entity and accumulate totals...
|
||
|
|
}
|
||
|
|
} finally {
|
||
|
|
cursor.close();
|
||
|
|
}</pre>
|
||
|
|
|
||
|
|
<p>The <a href="../../../com/sleepycat/je/LockMode.html" title="enum in com.sleepycat.je"><code>LockMode</code></a> parameter specifies locking behavior on a
|
||
|
|
per-operation basis. If null or <a href="../../../com/sleepycat/je/LockMode.html#DEFAULT"><code>LockMode.DEFAULT</code></a> is specified, the
|
||
|
|
default lock mode is used.</p>
|
||
|
|
|
||
|
|
<p>It is also possible to specify the default locking behavior for a cursor
|
||
|
|
using <a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je"><code>CursorConfig</code></a>. The example below is equivalent to the example
|
||
|
|
above:</p>
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
CursorConfig config = new CursorConfig();
|
||
|
|
config.setReadUncommitted(true);
|
||
|
|
<code>EntityCursor<Employee></code> cursor = primaryIndex.entities(txn, config);
|
||
|
|
try {
|
||
|
|
Employee entity;
|
||
|
|
while ((entity = cursor.next()) != null) {
|
||
|
|
// Examine the entity and accumulate totals...
|
||
|
|
}
|
||
|
|
} finally {
|
||
|
|
cursor.close();
|
||
|
|
}</pre>
|
||
|
|
|
||
|
|
<!-- begin JE only -->
|
||
|
|
<p>Note that <code>READ_UNCOMMITTED</code> can be used with a key cursor to
|
||
|
|
reduce I/O, potentially providing significant performance benefits. See <a
|
||
|
|
href="#keyCursorReadUncommitted">Key Cursor Optimization with
|
||
|
|
READ_UNCOMMITTED</a></p>
|
||
|
|
<!-- end JE only -->
|
||
|
|
|
||
|
|
<p>The use of other lock modes, cursor configuration, and transaction
|
||
|
|
configuration are discussed in <a
|
||
|
|
href="../../../../TransactionGettingStarted/index.html">Writing
|
||
|
|
Transactional Applications</a>.</p>
|
||
|
|
|
||
|
|
<h3><a name="retries">Performing Transaction Retries</a></h3>
|
||
|
|
|
||
|
|
<p>Lock conflict handling is another important topic discussed in <a
|
||
|
|
href="../../../../TransactionGettingStarted/index.html">Writing
|
||
|
|
Transactional Applications</a>. To go along with that material, here we
|
||
|
|
show a lock conflict handling loop in the context of the Direct Persistence
|
||
|
|
Layer. The example below shows deleting all entities in a primary index in
|
||
|
|
a single transaction. If a lock conflict occurs, the transaction is aborted
|
||
|
|
and the operation is retried.</p>
|
||
|
|
|
||
|
|
<!-- begin JE only -->
|
||
|
|
<p>This is a DPL version of the <a
|
||
|
|
href="../je/LockConflictException.html#retries">equivalent example code</a>
|
||
|
|
for the base API.</p>
|
||
|
|
|
||
|
|
<p>The following example code illustrates the recommended approach. Note
|
||
|
|
that the <code>Environment.beginTransaction</code> and <code>Transaction.commit</code>
|
||
|
|
calls are intentially inside the <code>try</code> block. When using JE-HA, this
|
||
|
|
will make it easy to add a <code>catch</code> for other exceptions that can be
|
||
|
|
resolved by retrying the transaction, such as consistency exceptions.</p>
|
||
|
|
<!-- end JE only -->
|
||
|
|
|
||
|
|
<pre class="code">
|
||
|
|
void doTransaction(final Environment env,
|
||
|
|
final <code>PrimaryIndex<Long, Employee></code> primaryIndex,
|
||
|
|
final int maxTries)
|
||
|
|
throws DatabaseException {
|
||
|
|
|
||
|
|
boolean success = false;
|
||
|
|
long sleepMillis = 0;
|
||
|
|
for (int i = 0; i < maxTries; i++) {
|
||
|
|
// Sleep before retrying.
|
||
|
|
if (sleepMillis != 0) {
|
||
|
|
Thread.sleep(sleepMillis);
|
||
|
|
sleepMillis = 0;
|
||
|
|
}
|
||
|
|
Transaction txn = null;
|
||
|
|
try {
|
||
|
|
txn = env.beginTransaction(null, null);
|
||
|
|
final <code>EntityCursor<Employee></code> cursor =
|
||
|
|
primaryIndex.entities(txn, null);
|
||
|
|
try {
|
||
|
|
// INSERT APP-SPECIFIC CODE HERE:
|
||
|
|
// Perform read and write operations, for example:
|
||
|
|
for (Employee entity : cursor) {
|
||
|
|
cursor.delete();
|
||
|
|
}
|
||
|
|
} finally {
|
||
|
|
cursor.close();
|
||
|
|
}
|
||
|
|
txn.commit();
|
||
|
|
success = true;
|
||
|
|
return;
|
||
|
|
} catch (LockConflictException e) {
|
||
|
|
sleepMillis = LOCK_CONFLICT_RETRY_SEC * 1000;
|
||
|
|
continue;
|
||
|
|
} finally {
|
||
|
|
if (!success) {
|
||
|
|
if (txn != null) {
|
||
|
|
txn.abort();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// INSERT APP-SPECIFIC CODE HERE:
|
||
|
|
// Transaction failed, despite retries.
|
||
|
|
// Take some app-specific course of action.
|
||
|
|
}</pre>
|
||
|
|
|
||
|
|
<h3>Low Level Access</h3>
|
||
|
|
|
||
|
|
<p>Each Direct Persistence Layer index is associated with an underlying
|
||
|
|
<a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je"><code>Database</code></a> or <a href="../../../com/sleepycat/je/SecondaryDatabase.html" title="class in com.sleepycat.je"><code>SecondaryDatabase</code></a> defined in the <a href="../../../com/sleepycat/je/package-summary.html"><code>Base API</code></a>. At this level, an index is a Btree managed by
|
||
|
|
the Berkeley DB Java Edition transactional storage engine. Although you may
|
||
|
|
never need to work at the <code>Base API</code> level, keep in mind that some
|
||
|
|
types of performance tuning can be done by configuring the underlying
|
||
|
|
databases. See the <a href="../../../com/sleepycat/persist/EntityStore.html" title="class in com.sleepycat.persist"><code>EntityStore</code></a> class for more information on
|
||
|
|
database and sequence configuration.</p>
|
||
|
|
|
||
|
|
<p>If you wish to access an index using the <code>Base API</code>, you may call
|
||
|
|
the <code>BasicIndex.getDatabase()</code> or <a href="../../../com/sleepycat/persist/SecondaryIndex.html#getDatabase--"><code>SecondaryIndex.getDatabase()</code></a>
|
||
|
|
method to get the underlying database. To translate between entity or key
|
||
|
|
objects and <a href="../../../com/sleepycat/je/DatabaseEntry.html" title="class in com.sleepycat.je"><code>DatabaseEntry</code></a> objects at this level, use the bindings
|
||
|
|
returned by <a href="../../../com/sleepycat/persist/PrimaryIndex.html#getEntityBinding--"><code>PrimaryIndex.getEntityBinding()</code></a>, <a href="../../../com/sleepycat/persist/PrimaryIndex.html#getKeyBinding--"><code>PrimaryIndex.getKeyBinding()</code></a>, and <a href="../../../com/sleepycat/persist/SecondaryIndex.html#getKeyBinding--"><code>SecondaryIndex.getKeyBinding()</code></a>.</p></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="simpleTagLabel">Author:</span></dt>
|
||
|
|
<dd>Mark Hayes</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
</div>
|
||
|
|
<div class="summary">
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<!-- ========== METHOD SUMMARY =========== -->
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList"><a name="method.summary">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<h3>Method Summary</h3>
|
||
|
|
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
|
||
|
|
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption>
|
||
|
|
<tr>
|
||
|
|
<th class="colFirst" scope="col">Modifier and Type</th>
|
||
|
|
<th class="colLast" scope="col">Method and Description</th>
|
||
|
|
</tr>
|
||
|
|
<tr id="i0" class="altColor">
|
||
|
|
<td class="colFirst"><code>boolean</code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#contains-K-">contains</a></span>(<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key)</code>
|
||
|
|
<div class="block">Checks for existence of a key in this index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i1" class="rowColor">
|
||
|
|
<td class="colFirst"><code>boolean</code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#contains-com.sleepycat.je.Transaction-K-com.sleepycat.je.LockMode-">contains</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key,
|
||
|
|
<a href="../../../com/sleepycat/je/LockMode.html" title="enum in com.sleepycat.je">LockMode</a> lockMode)</code>
|
||
|
|
<div class="block">Checks for existence of a key in this index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i2" class="altColor">
|
||
|
|
<td class="colFirst"><code>long</code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#count--">count</a></span>()</code>
|
||
|
|
<div class="block">Returns a non-transactional count of the entities in this index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i3" class="rowColor">
|
||
|
|
<td class="colFirst"><code>long</code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#count-long-">count</a></span>(long memoryLimit)</code>
|
||
|
|
<div class="block">Returns a non-transactional count of the entities in this index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i4" class="altColor">
|
||
|
|
<td class="colFirst"><code>boolean</code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#delete-K-">delete</a></span>(<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key)</code>
|
||
|
|
<div class="block">Deletes all entities with a given index key.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i5" class="rowColor">
|
||
|
|
<td class="colFirst"><code>boolean</code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#delete-com.sleepycat.je.Transaction-K-">delete</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key)</code>
|
||
|
|
<div class="block">Deletes all entities with a given index key.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i6" class="altColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/je/OperationResult.html" title="class in com.sleepycat.je">OperationResult</a></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#delete-com.sleepycat.je.Transaction-K-com.sleepycat.je.WriteOptions-">delete</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key,
|
||
|
|
<a href="../../../com/sleepycat/je/WriteOptions.html" title="class in com.sleepycat.je">WriteOptions</a> options)</code>
|
||
|
|
<div class="block">Deletes all entities with a given index key, using a WriteOptions
|
||
|
|
parameter and returning an OperationResult.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i7" class="rowColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#entities--">entities</a></span>()</code>
|
||
|
|
<div class="block">Opens a cursor for traversing all entities in this index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i8" class="altColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#entities-K-boolean-K-boolean-">entities</a></span>(<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> fromKey,
|
||
|
|
boolean fromInclusive,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> toKey,
|
||
|
|
boolean toInclusive)</code>
|
||
|
|
<div class="block">Opens a cursor for traversing entities in a key range.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i9" class="rowColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#entities-com.sleepycat.je.Transaction-com.sleepycat.je.CursorConfig-">entities</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je">CursorConfig</a> config)</code>
|
||
|
|
<div class="block">Opens a cursor for traversing all entities in this index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i10" class="altColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#entities-com.sleepycat.je.Transaction-K-boolean-K-boolean-com.sleepycat.je.CursorConfig-">entities</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> fromKey,
|
||
|
|
boolean fromInclusive,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> toKey,
|
||
|
|
boolean toInclusive,
|
||
|
|
<a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je">CursorConfig</a> config)</code>
|
||
|
|
<div class="block">Opens a cursor for traversing entities in a key range.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i11" class="rowColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#get-K-">get</a></span>(<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key)</code>
|
||
|
|
<div class="block">Gets an entity via a key of this index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i12" class="altColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityResult.html" title="class in com.sleepycat.persist">EntityResult</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#get-com.sleepycat.je.Transaction-K-com.sleepycat.je.Get-com.sleepycat.je.ReadOptions-">get</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key,
|
||
|
|
<a href="../../../com/sleepycat/je/Get.html" title="enum in com.sleepycat.je">Get</a> getType,
|
||
|
|
<a href="../../../com/sleepycat/je/ReadOptions.html" title="class in com.sleepycat.je">ReadOptions</a> options)</code>
|
||
|
|
<div class="block">Gets an entity via a key of this index, using Get type and ReadOptions
|
||
|
|
parameters, and returning an EntityResult.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i13" class="rowColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#get-com.sleepycat.je.Transaction-K-com.sleepycat.je.LockMode-">get</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key,
|
||
|
|
<a href="../../../com/sleepycat/je/LockMode.html" title="enum in com.sleepycat.je">LockMode</a> lockMode)</code>
|
||
|
|
<div class="block">Gets an entity via a key of this index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i14" class="altColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#getDatabase--">getDatabase</a></span>()</code>
|
||
|
|
<div class="block">Returns the underlying database for this index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i15" class="rowColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#keys--">keys</a></span>()</code>
|
||
|
|
<div class="block">Opens a cursor for traversing all keys in this index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i16" class="altColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#keys-K-boolean-K-boolean-">keys</a></span>(<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> fromKey,
|
||
|
|
boolean fromInclusive,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> toKey,
|
||
|
|
boolean toInclusive)</code>
|
||
|
|
<div class="block">Opens a cursor for traversing keys in a key range.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i17" class="rowColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#keys-com.sleepycat.je.Transaction-com.sleepycat.je.CursorConfig-">keys</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je">CursorConfig</a> config)</code>
|
||
|
|
<div class="block">Opens a cursor for traversing all keys in this index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i18" class="altColor">
|
||
|
|
<td class="colFirst"><code><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#keys-com.sleepycat.je.Transaction-K-boolean-K-boolean-com.sleepycat.je.CursorConfig-">keys</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> fromKey,
|
||
|
|
boolean fromInclusive,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> toKey,
|
||
|
|
boolean toInclusive,
|
||
|
|
<a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je">CursorConfig</a> config)</code>
|
||
|
|
<div class="block">Opens a cursor for traversing keys in a key range.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i19" class="rowColor">
|
||
|
|
<td class="colFirst"><code>java.util.Map<<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>,<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#map--">map</a></span>()</code>
|
||
|
|
<div class="block">Returns a standard Java map based on this entity index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr id="i20" class="altColor">
|
||
|
|
<td class="colFirst"><code>java.util.SortedMap<<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>,<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>></code></td>
|
||
|
|
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/persist/EntityIndex.html#sortedMap--">sortedMap</a></span>()</code>
|
||
|
|
<div class="block">Returns a standard Java sorted map based on this entity index.</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
</div>
|
||
|
|
<div class="details">
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<!-- ============ METHOD DETAIL ========== -->
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList"><a name="method.detail">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<h3>Method Detail</h3>
|
||
|
|
<a name="getDatabase--">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>getDatabase</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a> getDatabase()</pre>
|
||
|
|
<div class="block">Returns the underlying database for this index.</div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the database.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="contains-java.lang.Object-">
|
||
|
|
<!-- -->
|
||
|
|
</a><a name="contains-K-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>contains</h4>
|
||
|
|
<pre>boolean contains(<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Checks for existence of a key in this index.
|
||
|
|
|
||
|
|
<p>The operation will not be transaction protected, and <a href="../../../com/sleepycat/je/LockMode.html#DEFAULT"><code>LockMode.DEFAULT</code></a> is used implicitly.</p>
|
||
|
|
|
||
|
|
<!-- begin JE only -->
|
||
|
|
<p><code>READ_UNCOMMITTED</code> can be used with this method to reduce I/O,
|
||
|
|
since the record data item will not be read. This is the same benefit
|
||
|
|
as described in <a href="#keyCursorReadUncommitted">Key Cursor
|
||
|
|
Optimization with READ_UNCOMMITTED</a></p>
|
||
|
|
<!-- end JE only --></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>key</code> - the key to search for.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>whether the key exists in the index.
|
||
|
|
|
||
|
|
<!-- begin JE only --></dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
||
|
|
href="../je/OperationFailureException.html#readFailures">Read Operation
|
||
|
|
Failures</a> occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
||
|
|
environment-wide failure occurs.
|
||
|
|
<!-- end JE only --></dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="contains-com.sleepycat.je.Transaction-java.lang.Object-com.sleepycat.je.LockMode-">
|
||
|
|
<!-- -->
|
||
|
|
</a><a name="contains-com.sleepycat.je.Transaction-K-com.sleepycat.je.LockMode-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>contains</h4>
|
||
|
|
<pre>boolean contains(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key,
|
||
|
|
<a href="../../../com/sleepycat/je/LockMode.html" title="enum in com.sleepycat.je">LockMode</a> lockMode)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Checks for existence of a key in this index.
|
||
|
|
|
||
|
|
<!-- begin JE only -->
|
||
|
|
<p><code>READ_UNCOMMITTED</code> can be used with this method to reduce I/O,
|
||
|
|
since the record data item will not be read. This is the same benefit
|
||
|
|
as described in <a href="#keyCursorReadUncommitted">Key Cursor
|
||
|
|
Optimization with READ_UNCOMMITTED</a></p>
|
||
|
|
<!-- end JE only --></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>txn</code> - the transaction used to protect this operation, or null
|
||
|
|
if the operation should not be transaction protected.</dd>
|
||
|
|
<dd><code>key</code> - the key to search for.</dd>
|
||
|
|
<dd><code>lockMode</code> - the lock mode to use for this operation, or null to
|
||
|
|
use <a href="../../../com/sleepycat/je/LockMode.html#DEFAULT"><code>LockMode.DEFAULT</code></a>.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>whether the key exists in the index.
|
||
|
|
|
||
|
|
<!-- begin JE only --></dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
||
|
|
href="../je/OperationFailureException.html#readFailures">Read Operation
|
||
|
|
Failures</a> occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
||
|
|
environment-wide failure occurs.
|
||
|
|
<!-- end JE only --></dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="get-java.lang.Object-">
|
||
|
|
<!-- -->
|
||
|
|
</a><a name="get-K-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>get</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a> get(<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Gets an entity via a key of this index.
|
||
|
|
|
||
|
|
<p>The operation will not be transaction protected, and <a href="../../../com/sleepycat/je/LockMode.html#DEFAULT"><code>LockMode.DEFAULT</code></a> is used implicitly.</p></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>key</code> - the key to search for.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the value mapped to the given key, or null if the key is not
|
||
|
|
present in the index.
|
||
|
|
|
||
|
|
<!-- begin JE only --></dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
||
|
|
href="../je/OperationFailureException.html#readFailures">Read Operation
|
||
|
|
Failures</a> occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
||
|
|
environment-wide failure occurs.
|
||
|
|
<!-- end JE only --></dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="get-com.sleepycat.je.Transaction-java.lang.Object-com.sleepycat.je.LockMode-">
|
||
|
|
<!-- -->
|
||
|
|
</a><a name="get-com.sleepycat.je.Transaction-K-com.sleepycat.je.LockMode-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>get</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a> get(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key,
|
||
|
|
<a href="../../../com/sleepycat/je/LockMode.html" title="enum in com.sleepycat.je">LockMode</a> lockMode)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Gets an entity via a key of this index.</div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>txn</code> - the transaction used to protect this operation, or null
|
||
|
|
if the operation should not be transaction protected.</dd>
|
||
|
|
<dd><code>key</code> - the key to search for.</dd>
|
||
|
|
<dd><code>lockMode</code> - the lock mode to use for this operation, or null to
|
||
|
|
use <a href="../../../com/sleepycat/je/LockMode.html#DEFAULT"><code>LockMode.DEFAULT</code></a>.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the value mapped to the given key, or null if the key is not
|
||
|
|
present in the index.
|
||
|
|
|
||
|
|
<!-- begin JE only --></dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
||
|
|
href="../je/OperationFailureException.html#readFailures">Read Operation
|
||
|
|
Failures</a> occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
||
|
|
environment-wide failure occurs.
|
||
|
|
<!-- end JE only --></dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="get-com.sleepycat.je.Transaction-java.lang.Object-com.sleepycat.je.Get-com.sleepycat.je.ReadOptions-">
|
||
|
|
<!-- -->
|
||
|
|
</a><a name="get-com.sleepycat.je.Transaction-K-com.sleepycat.je.Get-com.sleepycat.je.ReadOptions-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>get</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/persist/EntityResult.html" title="class in com.sleepycat.persist">EntityResult</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>> get(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key,
|
||
|
|
<a href="../../../com/sleepycat/je/Get.html" title="enum in com.sleepycat.je">Get</a> getType,
|
||
|
|
<a href="../../../com/sleepycat/je/ReadOptions.html" title="class in com.sleepycat.je">ReadOptions</a> options)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Gets an entity via a key of this index, using Get type and ReadOptions
|
||
|
|
parameters, and returning an EntityResult.</div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>txn</code> - the transaction used to protect this operation, or null
|
||
|
|
if the operation should not be transaction protected.</dd>
|
||
|
|
<dd><code>key</code> - the key to search for.</dd>
|
||
|
|
<dd><code>getType</code> - must be <a href="../../../com/sleepycat/je/Get.html#SEARCH"><code>Get.SEARCH</code></a>.</dd>
|
||
|
|
<dd><code>options</code> - the ReadOptions, or null to use default options.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the EntityResult, including the value mapped to the given key,
|
||
|
|
or null if the key is not present in the index.</dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
||
|
|
href="../je/OperationFailureException.html#readFailures">Read Operation
|
||
|
|
Failures</a> occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
||
|
|
environment-wide failure occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
<dt><span class="simpleTagLabel">Since:</span></dt>
|
||
|
|
<dd>7.0</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="count--">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>count</h4>
|
||
|
|
<pre>long count()
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Returns a non-transactional count of the entities in this index.
|
||
|
|
|
||
|
|
<!-- begin JE only -->
|
||
|
|
|
||
|
|
<p>This operation is faster than obtaining a count by scanning the index
|
||
|
|
manually, and will not perturb the current contents of the cache.
|
||
|
|
However, the count is not guaranteed to be accurate if there are
|
||
|
|
concurrent updates. Note that this method does scan a significant
|
||
|
|
portion of the index and should be considered a fairly expensive
|
||
|
|
operation.</p>
|
||
|
|
|
||
|
|
<p>This operation will disable deletion of log files by the JE log
|
||
|
|
cleaner during its execution and will consume a certain amount of
|
||
|
|
memory (but without affecting the memory that is available for the
|
||
|
|
JE cache). To avoid excessive memory consumption (and a potential
|
||
|
|
<code>OutOfMemoryError</code>) this method places an internal limit on
|
||
|
|
its memory consumption. If this limit is reached, the method will
|
||
|
|
still work properly, but its performance will degrade. To specify
|
||
|
|
a different memory limit than the one used by this method, use the
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html#count-long-"><code>count(long memoryLimit)</code></a> method.</p>
|
||
|
|
|
||
|
|
<!-- end JE only --></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the number of entities in this index.
|
||
|
|
|
||
|
|
<!-- begin JE only --></dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
||
|
|
href="../je/OperationFailureException.html#readFailures">Read Operation
|
||
|
|
Failures</a> occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
||
|
|
environment-wide failure occurs.
|
||
|
|
<!-- end JE only --></dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="count-long-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>count</h4>
|
||
|
|
<pre>long count(long memoryLimit)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Returns a non-transactional count of the entities in this index.
|
||
|
|
|
||
|
|
<p>This operation is faster than obtaining a count by scanning the index
|
||
|
|
manually, and will not perturb the current contents of the cache.
|
||
|
|
However, the count is not guaranteed to be accurate if there are
|
||
|
|
concurrent updates. Note that this method does scan a significant
|
||
|
|
portion of the index and should be considered a fairly expensive
|
||
|
|
operation.</p>
|
||
|
|
|
||
|
|
<p>This operation will disable deletion of log files by the JE log
|
||
|
|
cleaner during its execution and will consume a certain amount of
|
||
|
|
memory (but without affecting the memory that is available for the
|
||
|
|
JE cache). To avoid excessive memory consumption (and a potential
|
||
|
|
<code>OutOfMemoryError</code>) this method takes as input an upper bound
|
||
|
|
on the memory it may consume. If this limit is reached, the method
|
||
|
|
will still work properly, but its performance will degrade.</p></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the number of entities in this index.</dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
||
|
|
href="../je/OperationFailureException.html#readFailures">Read Operation
|
||
|
|
Failures</a> occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
||
|
|
environment-wide failure occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="delete-java.lang.Object-">
|
||
|
|
<!-- -->
|
||
|
|
</a><a name="delete-K-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>delete</h4>
|
||
|
|
<pre>boolean delete(<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Deletes all entities with a given index key.
|
||
|
|
|
||
|
|
<p>Auto-commit is used implicitly if the store is transactional.</p></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>key</code> - the key to search for.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>whether any entities were deleted.
|
||
|
|
|
||
|
|
<!-- begin JE only --></dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
||
|
|
href="../je/OperationFailureException.html#writeFailures">Write
|
||
|
|
Operation Failures</a> occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
||
|
|
environment-wide failure occurs.
|
||
|
|
<!-- end JE only --></dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="delete-com.sleepycat.je.Transaction-java.lang.Object-">
|
||
|
|
<!-- -->
|
||
|
|
</a><a name="delete-com.sleepycat.je.Transaction-K-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>delete</h4>
|
||
|
|
<pre>boolean delete(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Deletes all entities with a given index key.</div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>txn</code> - the transaction used to protect this operation, null to use
|
||
|
|
auto-commit, or null if the store is non-transactional.</dd>
|
||
|
|
<dd><code>key</code> - the key to search for.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>whether any entities were deleted.
|
||
|
|
|
||
|
|
<!-- begin JE only --></dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
||
|
|
href="../je/OperationFailureException.html#writeFailures">Write
|
||
|
|
Operation Failures</a> occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
||
|
|
environment-wide failure occurs.
|
||
|
|
<!-- end JE only --></dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="delete-com.sleepycat.je.Transaction-java.lang.Object-com.sleepycat.je.WriteOptions-">
|
||
|
|
<!-- -->
|
||
|
|
</a><a name="delete-com.sleepycat.je.Transaction-K-com.sleepycat.je.WriteOptions-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>delete</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/je/OperationResult.html" title="class in com.sleepycat.je">OperationResult</a> delete(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> key,
|
||
|
|
<a href="../../../com/sleepycat/je/WriteOptions.html" title="class in com.sleepycat.je">WriteOptions</a> options)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Deletes all entities with a given index key, using a WriteOptions
|
||
|
|
parameter and returning an OperationResult.</div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>txn</code> - the transaction used to protect this operation, null to use
|
||
|
|
auto-commit, or null if the store is non-transactional.</dd>
|
||
|
|
<dd><code>key</code> - the key to search for.</dd>
|
||
|
|
<dd><code>options</code> - the WriteOptions, or null to use default options.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the OperationResult if any entities were deleted, else null. If</dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
|
||
|
|
href="../je/OperationFailureException.html#writeFailures">Write
|
||
|
|
Operation Failures</a> occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
|
||
|
|
environment-wide failure occurs.</dd>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
<dt><span class="simpleTagLabel">Since:</span></dt>
|
||
|
|
<dd>7.0</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="keys--">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>keys</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>> keys()
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Opens a cursor for traversing all keys in this index.
|
||
|
|
|
||
|
|
<p>The operations performed with the cursor will not be transaction
|
||
|
|
protected, and <a href="../../../com/sleepycat/je/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a> is used implicitly. If the
|
||
|
|
store is transactional, the cursor may not be used to update or delete
|
||
|
|
entities.</p>
|
||
|
|
|
||
|
|
<!-- begin JE only -->
|
||
|
|
<p>Note that <code>READ_UNCOMMITTED</code> can be used with a key cursor to
|
||
|
|
reduce I/O, potentially providing significant performance benefits. See
|
||
|
|
<a href="#keyCursorReadUncommitted">Key Cursor Optimization with
|
||
|
|
READ_UNCOMMITTED</a></p>
|
||
|
|
<!-- end JE only --></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the cursor.</dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="keys-com.sleepycat.je.Transaction-com.sleepycat.je.CursorConfig-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>keys</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>> keys(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je">CursorConfig</a> config)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Opens a cursor for traversing all keys in this index.
|
||
|
|
|
||
|
|
<!-- begin JE only -->
|
||
|
|
<p>Note that <code>READ_UNCOMMITTED</code> can be used with a key cursor to
|
||
|
|
reduce I/O, potentially providing significant performance benefits. See
|
||
|
|
<a href="#keyCursorReadUncommitted">Key Cursor Optimization with
|
||
|
|
READ_UNCOMMITTED</a></p>
|
||
|
|
<!-- end JE only --></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>txn</code> - the transaction used to protect all operations performed with
|
||
|
|
the cursor, or null if the operations should not be transaction
|
||
|
|
protected. If the store is non-transactional, null must be specified.
|
||
|
|
For a transactional store the transaction is optional for read-only
|
||
|
|
access and required for read-write access.</dd>
|
||
|
|
<dd><code>config</code> - the cursor configuration that determines the default lock
|
||
|
|
mode used for all cursor operations, or null to implicitly use <a href="../../../com/sleepycat/je/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a>.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the cursor.</dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="entities--">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>entities</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>> entities()
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Opens a cursor for traversing all entities in this index.
|
||
|
|
|
||
|
|
<p>The operations performed with the cursor will not be transaction
|
||
|
|
protected, and <a href="../../../com/sleepycat/je/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a> is used implicitly. If the
|
||
|
|
store is transactional, the cursor may not be used to update or delete
|
||
|
|
entities.</p></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the cursor.</dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="entities-com.sleepycat.je.Transaction-com.sleepycat.je.CursorConfig-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>entities</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>> entities(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je">CursorConfig</a> config)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Opens a cursor for traversing all entities in this index.</div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>txn</code> - the transaction used to protect all operations performed with
|
||
|
|
the cursor, or null if the operations should not be transaction
|
||
|
|
protected. If the store is non-transactional, null must be specified.
|
||
|
|
For a transactional store the transaction is optional for read-only
|
||
|
|
access and required for read-write access.</dd>
|
||
|
|
<dd><code>config</code> - the cursor configuration that determines the default lock
|
||
|
|
mode used for all cursor operations, or null to implicitly use <a href="../../../com/sleepycat/je/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a>.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the cursor.</dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="keys-java.lang.Object-boolean-java.lang.Object-boolean-">
|
||
|
|
<!-- -->
|
||
|
|
</a><a name="keys-K-boolean-K-boolean-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>keys</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>> keys(<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> fromKey,
|
||
|
|
boolean fromInclusive,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> toKey,
|
||
|
|
boolean toInclusive)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Opens a cursor for traversing keys in a key range.
|
||
|
|
|
||
|
|
<p>The operations performed with the cursor will not be transaction
|
||
|
|
protected, and <a href="../../../com/sleepycat/je/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a> is used implicitly. If the
|
||
|
|
store is transactional, the cursor may not be used to update or delete
|
||
|
|
entities.</p>
|
||
|
|
|
||
|
|
<!-- begin JE only -->
|
||
|
|
<p>Note that <code>READ_UNCOMMITTED</code> can be used with a key cursor to
|
||
|
|
reduce I/O, potentially providing significant performance benefits. See
|
||
|
|
<a href="#keyCursorReadUncommitted">Key Cursor Optimization with
|
||
|
|
READ_UNCOMMITTED</a></p>
|
||
|
|
<!-- end JE only --></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>fromKey</code> - is the lower bound of the key range, or null if the range
|
||
|
|
has no lower bound.</dd>
|
||
|
|
<dd><code>fromInclusive</code> - is true if keys greater than or equal to fromKey
|
||
|
|
should be included in the key range, or false if only keys greater than
|
||
|
|
fromKey should be included.</dd>
|
||
|
|
<dd><code>toKey</code> - is the upper bound of the key range, or null if the range
|
||
|
|
has no upper bound.</dd>
|
||
|
|
<dd><code>toInclusive</code> - is true if keys less than or equal to toKey should be
|
||
|
|
included in the key range, or false if only keys less than toKey should
|
||
|
|
be included.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the cursor.</dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="keys-com.sleepycat.je.Transaction-java.lang.Object-boolean-java.lang.Object-boolean-com.sleepycat.je.CursorConfig-">
|
||
|
|
<!-- -->
|
||
|
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</a><a name="keys-com.sleepycat.je.Transaction-K-boolean-K-boolean-com.sleepycat.je.CursorConfig-">
|
||
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<!-- -->
|
||
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</a>
|
||
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<ul class="blockList">
|
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<li class="blockList">
|
||
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|
<h4>keys</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>> keys(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> fromKey,
|
||
|
|
boolean fromInclusive,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> toKey,
|
||
|
|
boolean toInclusive,
|
||
|
|
<a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je">CursorConfig</a> config)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Opens a cursor for traversing keys in a key range.
|
||
|
|
|
||
|
|
<!-- begin JE only -->
|
||
|
|
<a name="keyCursorReadUncommitted"><h4>Key Cursor Optimization with
|
||
|
|
READ_UNCOMMITTED</h4></a>
|
||
|
|
|
||
|
|
<p>Using a key cursor potentially has a large performance benefit when
|
||
|
|
the <code>READ_UNCOMMITTED</code> isolation mode is used. In this case, if
|
||
|
|
the record data is not in the JE cache, it will not be read from disk.
|
||
|
|
The performance benefit is potentially large because random access disk
|
||
|
|
reads may be reduced. Examples are:</p>
|
||
|
|
<ul>
|
||
|
|
<li>Scanning all records in key order, when the entity is not needed and
|
||
|
|
<code>READ_UNCOMMITTED</code> isolation is acceptable.</li>
|
||
|
|
<li>Skipping over records quickly to perform approximate pagination with
|
||
|
|
<code>READ_UNCOMMITTED</code> isolation.</li>
|
||
|
|
</ul>
|
||
|
|
|
||
|
|
<p>For other isolation modes (<code>READ_COMMITTED</code>, <code>REPEATABLE_READ</code> and <code>SERIALIZABLE</code>), the performance benefit of a
|
||
|
|
key cursor is not as significant. In this case, the data item must be
|
||
|
|
read into the JE cache if it is not already present, in order to lock
|
||
|
|
the record. The only performance benefit is that the data will not be
|
||
|
|
copied from the JE cache to the application's entry parameter, and will
|
||
|
|
not be unmarshalled into an entity object.</p>
|
||
|
|
|
||
|
|
<p>For information on specifying isolation modes, see <a href="../../../com/sleepycat/je/LockMode.html" title="enum in com.sleepycat.je"><code>LockMode</code></a>,
|
||
|
|
<a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je"><code>CursorConfig</code></a> and <a href="../../../com/sleepycat/je/TransactionConfig.html" title="class in com.sleepycat.je"><code>TransactionConfig</code></a>.</p>
|
||
|
|
<!-- end JE only --></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>txn</code> - the transaction used to protect all operations performed with
|
||
|
|
the cursor, or null if the operations should not be transaction
|
||
|
|
protected. If the store is non-transactional, null must be specified.
|
||
|
|
For a transactional store the transaction is optional for read-only
|
||
|
|
access and required for read-write access.</dd>
|
||
|
|
<dd><code>fromKey</code> - is the lower bound of the key range, or null if the range
|
||
|
|
has no lower bound.</dd>
|
||
|
|
<dd><code>fromInclusive</code> - is true if keys greater than or equal to fromKey
|
||
|
|
should be included in the key range, or false if only keys greater than
|
||
|
|
fromKey should be included.</dd>
|
||
|
|
<dd><code>toKey</code> - is the upper bound of the key range, or null if the range
|
||
|
|
has no upper bound.</dd>
|
||
|
|
<dd><code>toInclusive</code> - is true if keys less than or equal to toKey should be
|
||
|
|
included in the key range, or false if only keys less than toKey should
|
||
|
|
be included.</dd>
|
||
|
|
<dd><code>config</code> - the cursor configuration that determines the default lock
|
||
|
|
mode used for all cursor operations, or null to implicitly use <a href="../../../com/sleepycat/je/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a>.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the cursor.</dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="entities-java.lang.Object-boolean-java.lang.Object-boolean-">
|
||
|
|
<!-- -->
|
||
|
|
</a><a name="entities-K-boolean-K-boolean-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>entities</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>> entities(<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> fromKey,
|
||
|
|
boolean fromInclusive,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> toKey,
|
||
|
|
boolean toInclusive)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Opens a cursor for traversing entities in a key range.
|
||
|
|
|
||
|
|
<p>The operations performed with the cursor will not be transaction
|
||
|
|
protected, and <a href="../../../com/sleepycat/je/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a> is used implicitly. If the
|
||
|
|
store is transactional, the cursor may not be used to update or delete
|
||
|
|
entities.</p></div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>fromKey</code> - is the lower bound of the key range, or null if the range
|
||
|
|
has no lower bound.</dd>
|
||
|
|
<dd><code>fromInclusive</code> - is true if keys greater than or equal to fromKey
|
||
|
|
should be included in the key range, or false if only keys greater than
|
||
|
|
fromKey should be included.</dd>
|
||
|
|
<dd><code>toKey</code> - is the upper bound of the key range, or null if the range
|
||
|
|
has no upper bound.</dd>
|
||
|
|
<dd><code>toInclusive</code> - is true if keys less than or equal to toKey should be
|
||
|
|
included in the key range, or false if only keys less than toKey should
|
||
|
|
be included.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the cursor.</dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="entities-com.sleepycat.je.Transaction-java.lang.Object-boolean-java.lang.Object-boolean-com.sleepycat.je.CursorConfig-">
|
||
|
|
<!-- -->
|
||
|
|
</a><a name="entities-com.sleepycat.je.Transaction-K-boolean-K-boolean-com.sleepycat.je.CursorConfig-">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>entities</h4>
|
||
|
|
<pre><a href="../../../com/sleepycat/persist/EntityCursor.html" title="interface in com.sleepycat.persist">EntityCursor</a><<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>> entities(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> fromKey,
|
||
|
|
boolean fromInclusive,
|
||
|
|
<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a> toKey,
|
||
|
|
boolean toInclusive,
|
||
|
|
<a href="../../../com/sleepycat/je/CursorConfig.html" title="class in com.sleepycat.je">CursorConfig</a> config)
|
||
|
|
throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
|
||
|
|
<div class="block">Opens a cursor for traversing entities in a key range.</div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="paramLabel">Parameters:</span></dt>
|
||
|
|
<dd><code>txn</code> - the transaction used to protect all operations performed with
|
||
|
|
the cursor, or null if the operations should not be transaction
|
||
|
|
protected. If the store is non-transactional, null must be specified.
|
||
|
|
For a transactional store the transaction is optional for read-only
|
||
|
|
access and required for read-write access.</dd>
|
||
|
|
<dd><code>fromKey</code> - is the lower bound of the key range, or null if the range
|
||
|
|
has no lower bound.</dd>
|
||
|
|
<dd><code>fromInclusive</code> - is true if keys greater than or equal to fromKey
|
||
|
|
should be included in the key range, or false if only keys greater than
|
||
|
|
fromKey should be included.</dd>
|
||
|
|
<dd><code>toKey</code> - is the upper bound of the key range, or null if the range
|
||
|
|
has no upper bound.</dd>
|
||
|
|
<dd><code>toInclusive</code> - is true if keys less than or equal to toKey should be
|
||
|
|
included in the key range, or false if only keys less than toKey should
|
||
|
|
be included.</dd>
|
||
|
|
<dd><code>config</code> - the cursor configuration that determines the default lock
|
||
|
|
mode used for all cursor operations, or null to implicitly use <a href="../../../com/sleepycat/je/CursorConfig.html#DEFAULT"><code>CursorConfig.DEFAULT</code></a>.</dd>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the cursor.</dd>
|
||
|
|
<dt><span class="throwsLabel">Throws:</span></dt>
|
||
|
|
<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code> - the base class for all BDB exceptions.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="map--">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockList">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>map</h4>
|
||
|
|
<pre>java.util.Map<<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>,<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>> map()</pre>
|
||
|
|
<div class="block">Returns a standard Java map based on this entity index. The <a href="../../../com/sleepycat/collections/StoredMap.html" title="class in com.sleepycat.collections"><code>StoredMap</code></a> returned is defined by the <a href="../../../com/sleepycat/collections/package-summary.html">Collections API</a>. Stored collections conform
|
||
|
|
to the standard Java collections framework interface.</div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the map.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<a name="sortedMap--">
|
||
|
|
<!-- -->
|
||
|
|
</a>
|
||
|
|
<ul class="blockListLast">
|
||
|
|
<li class="blockList">
|
||
|
|
<h4>sortedMap</h4>
|
||
|
|
<pre>java.util.SortedMap<<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">K</a>,<a href="../../../com/sleepycat/persist/EntityIndex.html" title="type parameter in EntityIndex">V</a>> sortedMap()</pre>
|
||
|
|
<div class="block">Returns a standard Java sorted map based on this entity index. The
|
||
|
|
<a href="../../../com/sleepycat/collections/StoredSortedMap.html" title="class in com.sleepycat.collections"><code>StoredSortedMap</code></a> returned is defined by the <a href="../../../com/sleepycat/collections/package-summary.html">Collections API</a>. Stored collections conform
|
||
|
|
to the standard Java collections framework interface.</div>
|
||
|
|
<dl>
|
||
|
|
<dt><span class="returnLabel">Returns:</span></dt>
|
||
|
|
<dd>the map.</dd>
|
||
|
|
</dl>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
</div>
|
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|
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</div>
|
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<!-- ========= END OF CLASS DATA ========= -->
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<div class="aboutLanguage"><b>Berkeley DB Java Edition</b><br><font size=\"-1\"> version 7.5.11</font>
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