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<title>Sequence (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.je</div>
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<h2 title="Class Sequence" class="title">Class Sequence</h2>
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<div class="contentContainer">
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<ul class="inheritance">
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<li>java.lang.Object</li>
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<ul class="inheritance">
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<li>com.sleepycat.je.Sequence</li>
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<dt>All Implemented Interfaces:</dt>
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<dd>java.io.Closeable, java.lang.AutoCloseable</dd>
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<hr>
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<br>
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<pre>public class <span class="typeNameLabel">Sequence</span>
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extends java.lang.Object
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implements java.io.Closeable</pre>
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<div class="block">A Sequence handle is used to manipulate a sequence record in a
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database. Sequence handles are opened using the <a href="../../../com/sleepycat/je/Database.html#openSequence-com.sleepycat.je.Transaction-com.sleepycat.je.DatabaseEntry-com.sleepycat.je.SequenceConfig-"><code>Database.openSequence</code></a> method.</div>
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<!-- ========== METHOD SUMMARY =========== -->
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<h3>Method Summary</h3>
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<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
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<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="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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</tr>
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<tr id="i0" class="altColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Sequence.html#close--">close</a></span>()</code>
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<div class="block">Closes a sequence.</div>
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</td>
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</tr>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code>long</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Sequence.html#get-com.sleepycat.je.Transaction-int-">get</a></span>(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
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int delta)</code>
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<div class="block">Returns the next available element in the sequence and changes the
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sequence value by <code>delta</code>.</div>
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</td>
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</tr>
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<tr id="i2" class="altColor">
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<td class="colFirst"><code><a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Sequence.html#getDatabase--">getDatabase</a></span>()</code>
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<div class="block">Returns the Database handle associated with this sequence.</div>
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</td>
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</tr>
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<tr id="i3" class="rowColor">
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<td class="colFirst"><code><a href="../../../com/sleepycat/je/DatabaseEntry.html" title="class in com.sleepycat.je">DatabaseEntry</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Sequence.html#getKey--">getKey</a></span>()</code>
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<div class="block">Returns the DatabaseEntry used to open this sequence.</div>
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</td>
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</tr>
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<tr id="i4" class="altColor">
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<td class="colFirst"><code><a href="../../../com/sleepycat/je/SequenceStats.html" title="class in com.sleepycat.je">SequenceStats</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/sleepycat/je/Sequence.html#getStats-com.sleepycat.je.StatsConfig-">getStats</a></span>(<a href="../../../com/sleepycat/je/StatsConfig.html" title="class in com.sleepycat.je">StatsConfig</a> config)</code>
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<div class="block">Returns statistical information about the sequence.</div>
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</td>
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</tr>
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</table>
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<ul class="blockList">
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<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
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</a>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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<div class="details">
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<ul class="blockList">
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<li class="blockList">
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<!-- ============ METHOD DETAIL ========== -->
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<li class="blockList"><a name="method.detail">
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<!-- -->
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</a>
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<h3>Method Detail</h3>
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<a name="close--">
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<!-- -->
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<ul class="blockList">
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<h4>close</h4>
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<pre>public void close()
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throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
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<div class="block">Closes a sequence. Any unused cached values are lost.
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<p>The sequence handle may not be used again after this method has
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been called, regardless of the method's success or failure.</p>
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<p>WARNING: To guard against memory leaks, the application should
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discard all references to the closed handle. While BDB makes an effort
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to discard references from closed objects to the allocated memory for an
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environment, this behavior is not guaranteed. The safe course of action
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for an application is to discard all references to closed BDB
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objects.</p></div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code>close</code> in interface <code>java.io.Closeable</code></dd>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code>close</code> in interface <code>java.lang.AutoCloseable</code></dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
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environment-wide failure occurs.</dd>
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<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
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</dl>
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</li>
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</ul>
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<a name="get-com.sleepycat.je.Transaction-int-">
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<h4>get</h4>
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<pre>public long get(<a href="../../../com/sleepycat/je/Transaction.html" title="class in com.sleepycat.je">Transaction</a> txn,
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int delta)
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throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
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<div class="block">Returns the next available element in the sequence and changes the
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sequence value by <code>delta</code>. The value of <code>delta</code>
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must be greater than zero. If there are enough cached values in the
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sequence handle then they will be returned. Otherwise the next value
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will be fetched from the database and incremented (decremented) by
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enough to cover the <code>delta</code> and the next batch of cached
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values.
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This method is synchronized to protect updating of the cached value,
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since multiple threads may share a single handle. Multiple handles for
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the same database/key may be used to increase concurrency.</p>
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<p>The <code>txn</code> handle must be null if the sequence handle was
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opened with a non-zero cache size.</p>
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<p>For maximum concurrency, a non-zero cache size should be specified
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prior to opening the sequence handle, the <code>txn</code> handle should
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be <code>null</code>, and <a href="../../../com/sleepycat/je/SequenceConfig.html#setAutoCommitNoSync-boolean-"><code>SequenceConfig.setAutoCommitNoSync</code></a> should be called to disable log
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flushes.</p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>txn</code> - For a transactional database, an explicit transaction may be
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specified, or null may be specified to use auto-commit. For a
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non-transactional database, null must be specified.</dd>
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<dd><code>delta</code> - the amount by which to increment or decrement the sequence</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the next available element in the sequence</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="../../../com/sleepycat/je/SequenceOverflowException.html" title="class in com.sleepycat.je">SequenceOverflowException</a></code> - if the end of the sequence is reached
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and wrapping is not configured.</dd>
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<dd><code><a href="../../../com/sleepycat/je/SequenceIntegrityException.html" title="class in com.sleepycat.je">SequenceIntegrityException</a></code> - if the sequence record has been
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deleted.</dd>
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<dd><code><a href="../../../com/sleepycat/je/OperationFailureException.html" title="class in com.sleepycat.je">OperationFailureException</a></code> - if one of the <a
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href="../je/OperationFailureException.html#writeFailures">Write
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Operation Failures</a> occurs.</dd>
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<dd><code><a href="../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
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environment-wide failure occurs.</dd>
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<dd><code>java.lang.IllegalArgumentException</code> - if the delta is less than or equal to
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zero, or larger than the size of the sequence's range.</dd>
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<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
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</dl>
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</li>
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</ul>
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<a name="getDatabase--">
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<h4>getDatabase</h4>
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<pre>public <a href="../../../com/sleepycat/je/Database.html" title="class in com.sleepycat.je">Database</a> getDatabase()</pre>
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<div class="block">Returns the Database handle associated with this sequence.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>The Database handle associated with this sequence.</dd>
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</dl>
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</li>
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</ul>
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<a name="getKey--">
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<h4>getKey</h4>
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<pre>public <a href="../../../com/sleepycat/je/DatabaseEntry.html" title="class in com.sleepycat.je">DatabaseEntry</a> getKey()</pre>
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<div class="block">Returns the DatabaseEntry used to open this sequence.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>The DatabaseEntry used to open this sequence.</dd>
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</dl>
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</li>
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</ul>
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<a name="getStats-com.sleepycat.je.StatsConfig-">
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<!-- -->
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</a>
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<ul class="blockListLast">
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<li class="blockList">
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<h4>getStats</h4>
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<pre>public <a href="../../../com/sleepycat/je/SequenceStats.html" title="class in com.sleepycat.je">SequenceStats</a> getStats(<a href="../../../com/sleepycat/je/StatsConfig.html" title="class in com.sleepycat.je">StatsConfig</a> config)
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throws <a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
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<div class="block">Returns statistical information about the sequence.
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<p>In the presence of multiple threads or processes accessing an active
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sequence, the information returned by this method may be
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out-of-date.</p>
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<p>The getStats method cannot be transaction-protected. For this reason,
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it should be called in a thread of control that has no open cursors or
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active transactions.</p></div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>config</code> - The statistics returned; if null, default statistics are
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returned.</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>Sequence statistics.</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="../../../com/sleepycat/je/SequenceIntegrityException.html" title="class in com.sleepycat.je">SequenceIntegrityException</a></code> - if the sequence record has been
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deleted.</dd>
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<dd><code><a href="../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
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</dl>
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</li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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