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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>Entity (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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<li>Summary: </li>
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<li>Field | </li>
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<li>Required | </li>
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<li><a href="#annotation.type.optional.element.summary">Optional</a></li>
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</ul>
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<ul class="subNavList">
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<li>Detail: </li>
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<li>Field | </li>
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<li><a href="#annotation.type.element.detail">Element</a></li>
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<!-- ======== START OF CLASS DATA ======== -->
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<div class="header">
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<div class="subTitle">com.sleepycat.persist.model</div>
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<h2 title="Annotation Type Entity" class="title">Annotation Type Entity</h2>
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<div class="description">
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<ul class="blockList">
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<li class="blockList">
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<hr>
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<br>
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<pre>@Documented
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@Retention(value=RUNTIME)
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@Target(value=TYPE)
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public @interface <span class="memberNameLabel">Entity</span></pre>
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<div class="block">Indicates a persistent entity class. For each entity class, a <a href="../../../../com/sleepycat/persist/PrimaryIndex.html" title="class in com.sleepycat.persist"><code>PrimaryIndex</code></a> can be used to store and access instances of that class.
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Optionally, one or more <a href="../../../../com/sleepycat/persist/SecondaryIndex.html" title="class in com.sleepycat.persist"><code>SecondaryIndex</code></a> objects may be used to access
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entity instances by secondary key.
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<p><strong>Entity Subclasses and Superclasses</strong></p>
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<p>An entity class may have any number of subclasses and superclasses;
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however, none of these may themselves be entity classes (annotated with
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<code>Entity</code>).</p>
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<p>Entity superclasses (which must be annotated with <code>Persistent</code>, not
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<code>Entity</code>) are used to share common definitions among entity classes.
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Fields in an entity superclass may be defined as primary or secondary keys.
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For example, the following <code>BaseClass</code> defines the primary key for any
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number of entity classes, using a single sequence to assign primary key
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values that will be unique across all entity classes that use it. The
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entity class <code>Pet</code> extends the base class, implicitly defining a
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primary index</p>
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<pre class="code">
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@Persistent
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class BaseClass {
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@PrimaryKey(sequence="ID")
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long id;
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}
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@Entity
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class Pet extends BaseClass {
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@SecondaryKey(relate=ONE_TO_ONE)
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String name;
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float height;
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float weight;
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}</pre>
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<p>Entity subclasses (which must be annotated with <code>Persistent</code>, not
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<code>Entity</code>) are used to provide polymorphism within a single <code>PrimaryIndex</code>. Instances of the entity class and its subclasses are stored
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in the same <code>PrimaryIndex</code>. For example, the entity class <code>Pet</code>
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defines a primary index that will contain instances of it and its
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subclasses, including <code>Cat</code> which is defined below.</p>
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<p>Fields in an entity subclass may be defined as secondary keys, and such
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secondary keys can only be used to query instances of the subclass. For
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example, although the primary key (<code>id</code>) and secondary key (<code>name</code>) can be used to retrieve any <code>Pet</code> instance, the entity subclass
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<code>Cat</code> defines a secondary key (<code>finickyness</code>) that only applies
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to <code>Cat</code> instances. Querying by this key will never retrieve a <code>Dog</code> instance, if such a subclass existed, because a <code>Dog</code> instance
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will never contain a <code>finickyness</code> key.</p>
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<pre class="code">
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@Persistent
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class Cat extends Pet {
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@SecondaryKey(relate=MANY_TO_ONE)
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int finickyness;
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}</pre>
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<p><em>WARNING:</em> Entity subclasses that define secondary keys must be
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registered prior to storing an instance of the class. This can be done in
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two ways:</p>
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<ol>
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<li>The <a href="../../../../com/sleepycat/persist/model/EntityModel.html#registerClass-java.lang.Class-"><code>registerClass</code></a> method may be called
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to register the subclass before opening the entity store.</li>
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<li>The <a href="../../../../com/sleepycat/persist/EntityStore.html#getSubclassIndex-com.sleepycat.persist.PrimaryIndex-java.lang.Class-java.lang.Class-java.lang.String-"><code>getSubclassIndex</code></a> method may be
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called to implicitly register the subclass after opening the entity
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store.</li>
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</ol>
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<p><strong>Persistent Fields and Types</strong></p>
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<p>All non-transient instance fields of an entity class, as well as its
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superclasses and subclasses, are persistent. <code>static</code> and <code>transient</code> fields are not persistent. The persistent fields of a class may
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be <code>private</code>, package-private (default access), <code>protected</code> or
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<code>public</code>.</p>
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<p>It is worthwhile to note the reasons that object persistence is defined
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in terms of fields rather than properties (getters and setters). This
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allows business methods (getters and setters) to be defined independently of
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the persistent state of an object; for example, a setter method may perform
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validation that could not be performed if it were called during object
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deserialization. Similarly, this allows public methods to evolve somewhat
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independently of the (typically non-public) persistent fields.</p>
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<p><a name="simpleTypes"><strong>Simple Types</strong></a></p>
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<p>Persistent types are divided into simple types, enum types, complex
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types, and array types. Simple types and enum types are single valued,
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while array types may contain multiple elements and complex types may
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contain one or more named fields.</p>
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<p>Simple types include:</p>
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<ul>
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<li>Java primitive types: <code>boolean, char, byte, short, int, long,
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float, double</code></li>
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<li>The wrapper classes for Java primitive types</li>
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<li><code>BigDecimal</code></li>
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<li><code>BigInteger</code></li>
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<li><code>String</code></li>
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<li><code>Date</code></li>
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</ul>
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<p>When null values are required (for optional key fields, for example),
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primitive wrapper classes must be used instead of primitive types.</p>
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<p>Simple types, enum types and array types do not require annotations to
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make them persistent.</p>
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<p><a name="proxyTypes"><strong>Complex and Proxy Types</strong></a></p>
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<p>Complex persistent classes must be annotated with <a href="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><code>Entity</code></a> or
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<a href="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><code>Persistent</code></a>, or must be proxied by a persistent proxy class
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(described below). This includes entity classes, subclasses and
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superclasses, and all other complex classes referenced via fields of these
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classes.</p>
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<p>All complex persistent classes must have a default constructor. The
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default constructor may be <code>private</code>, package-private (default
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access), <code>protected</code>, or <code>public</code>. Other constructors are
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allowed but are not used by the persistence mechanism.</p>
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<p>It is sometimes desirable to store instances of a type that is externally
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defined and cannot be annotated or does not have a default constructor; for
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example, a class defined in the Java standard libraries or a 3rd party
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library. In this case, a <a href="../../../../com/sleepycat/persist/model/PersistentProxy.html" title="interface in com.sleepycat.persist.model"><code>PersistentProxy</code></a> class may be used to
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represent the stored values for the externally defined type. The proxy
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class itself must be annotated with <a href="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><code>Persistent</code></a> like other persistent
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classes, and the <a href="../../../../com/sleepycat/persist/model/Persistent.html#proxyFor--"><code>Persistent.proxyFor()</code></a> property must be specified.</p>
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<p>For convenience, built-in proxy classes are included for several common
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classes (listed below) in the Java library. If you wish, you may define
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your own <a href="../../../../com/sleepycat/persist/model/PersistentProxy.html" title="interface in com.sleepycat.persist.model"><code>PersistentProxy</code></a> to override these built-in proxies.</p>
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<ul>
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<li><code>HashSet</code></li>
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<li><code>TreeSet</code></li>
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<li><code>HashMap</code></li>
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<li><code>TreeMap</code></li>
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<li><code>ArrayList</code></li>
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<li><code>LinkedList</code></li>
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</ul>
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<p>Complex persistent types should in general be application-defined
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classes. This gives the application control over the persistent state and
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its evolution over time.</p>
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<p><strong>Other Type Restrictions</strong></p>
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<p>Entity classes and subclasses may not be used in field declarations for
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persistent types. Fields of entity classes and subclasses must be simple
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types or non-entity persistent types (annotated with <a href="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><code>Persistent</code></a> not
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with <a href="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><code>Entity</code></a>).</p>
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<p>Entity classes, subclasses and superclasses may be <code>abstract</code> and
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may implement arbitrary interfaces. Interfaces do not need to be annotated
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with <a href="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><code>Persistent</code></a> in order to be used in a persistent class, since
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interfaces do not contain instance fields.</p>
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<p>Persistent instances of static nested classes are allowed, but the nested
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class must be annotated with <a href="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><code>Persistent</code></a> or <a href="../../../../com/sleepycat/persist/model/Entity.html" title="annotation in com.sleepycat.persist.model"><code>Entity</code></a>. Inner
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classes (non-static nested classes, including anonymous classes) are not
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currently allowed as persistent types.</p>
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<p>Arrays of simple and persistent complex types are allowed as fields of
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persistent types. Arrays may be multidimensional. However, an array may
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not be stored as a top level instance in a primary index. Only instances of
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entity classes and subclasses may be top level instances in a primary
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index.</p>
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<p><strong>Embedded Objects</strong></p>
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<p>As stated above, the embedded (or member) non-transient non-static fields
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of an entity class are themselves persistent and are stored along with their
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parent entity object. This allows embedded objects to be stored in an
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entity to an arbitrary depth.</p>
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<p>There is no arbitrary limit to the nesting depth of embedded objects
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within an entity; however, there is a practical limit. When an entity is
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marshalled, each level of nesting is implemented internally via recursive
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|
method calls. If the nesting depth is large enough, a <code>StackOverflowError</code> can occur. In practice, this has been observed with a
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nesting depth of 12,000, using the default Java stack size.</p>
|
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|
|
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<p>This restriction on the nesting depth of embedded objects does not apply
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to cyclic references, since these are handled specially as described
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below.</p>
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|
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<p><strong>Object Graphs</strong></p>
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|
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<p>When an entity instance is stored, the graph of objects referenced via
|
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|
its fields is stored and retrieved as a graph. In other words, if a single
|
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|
instance is referenced by two or more fields when the entity is stored, the
|
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|
same will be true when the entity is retrieved.</p>
|
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|
|
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<p>When a reference to a particular object is stored as a member field
|
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inside that object or one of its embedded objects, this is called a cyclic
|
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reference. Because multiple references to a single object are stored as
|
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|
such, cycles are also represented correctly and do not cause infinite
|
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|
recursion or infinite processing loops. If an entity containing a cyclic
|
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reference is stored, the cyclic reference will be present when the entity is
|
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retrieved.</p>
|
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|
|
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<p>Note that the stored object graph is restricted in scope to a single
|
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entity instance. This is because each entity instance is stored separately.
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If two entities have a reference to the same object when stored, they will
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refer to two separate instances when the entities are retrieved.</p></div>
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<dl>
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||
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<dt><span class="simpleTagLabel">Author:</span></dt>
|
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<dd>Mark Hayes</dd>
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<dt><span class="seeLabel">See Also:</span></dt>
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||
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<dd><a href="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><code>Persistent</code></a>,
|
||
|
<a href="../../../../com/sleepycat/persist/model/PrimaryKey.html" title="annotation in com.sleepycat.persist.model"><code>PrimaryKey</code></a>,
|
||
|
<a href="../../../../com/sleepycat/persist/model/SecondaryKey.html" title="annotation in com.sleepycat.persist.model"><code>SecondaryKey</code></a>,
|
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<a href="../../../../com/sleepycat/persist/model/KeyField.html" title="annotation in com.sleepycat.persist.model"><code>KeyField</code></a></dd>
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</dl>
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</li>
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</ul>
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</div>
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<div class="summary">
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<ul class="blockList">
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<li class="blockList">
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<!-- =========== ANNOTATION TYPE OPTIONAL MEMBER SUMMARY =========== -->
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<ul class="blockList">
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<li class="blockList"><a name="annotation.type.optional.element.summary">
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<!-- -->
|
||
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</a>
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<h3>Optional Element Summary</h3>
|
||
|
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Optional Element Summary table, listing optional elements, and an explanation">
|
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<caption><span>Optional Elements</span><span class="tabEnd"> </span></caption>
|
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<tr>
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||
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Optional Element and Description</th>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>int</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/persist/model/Entity.html#version--">version</a></span></code>
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<div class="block">Identifies a new version of a class when an incompatible class change
|
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has been made.</div>
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</td>
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</tr>
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</table>
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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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<h3>Element Detail</h3>
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<a name="version--">
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<h4>version</h4>
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<pre>public abstract int version</pre>
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<div class="block">Identifies a new version of a class when an incompatible class change
|
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|
has been made. Prior versions of a class are referred to by version
|
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|
number to perform class evolution and conversion using <a href="../../../../com/sleepycat/persist/evolve/Mutations.html" title="class in com.sleepycat.persist.evolve"><code>Mutations</code></a>.
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<p>The first version of a class is version zero, if <a href="../../../../com/sleepycat/persist/model/Entity.html#version--"><code>version()</code></a> is
|
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not specified. When an incompatible class change is made, a version
|
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number must be assigned using <a href="../../../../com/sleepycat/persist/model/Entity.html#version--"><code>version()</code></a> that is higher than the
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previous version number for the class. If this is not done, an <a href="../../../../com/sleepycat/persist/evolve/IncompatibleClassException.html" title="class in com.sleepycat.persist.evolve"><code>IncompatibleClassException</code></a> will be thrown when the store is opened.</p></div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>the version.</dd>
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</dl>
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<dl>
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<dt>Default:</dt>
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||
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<dd>0</dd>
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</dl>
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