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<!-- Generated by javadoc (build 1.5.0) on Thu May 15 17:17:33 EDT 2008 -->
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Entity (Oracle - Berkeley DB Java API)
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<META NAME="keywords" CONTENT="com.sleepycat.persist.model.Entity class">
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<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD>
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<TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD>
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<TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Entity.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD>
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<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
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<b>Berkeley DB</b><br><font size="-1"> version 4.7.25</font></EM>
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<A HREF="../../../../com/sleepycat/persist/model/DeleteAction.html" title="enum in com.sleepycat.persist.model"><B>PREV CLASS</B></A>
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<A HREF="../../../../com/sleepycat/persist/model/EntityMetadata.html" title="class in com.sleepycat.persist.model"><B>NEXT CLASS</B></A></FONT></TD>
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SUMMARY: REQUIRED | <A HREF="#annotation_type_optional_element_summary">OPTIONAL</A></FONT></TD>
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DETAIL: <A HREF="#annotation_type_element_detail">ELEMENT</A></FONT></TD>
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<H2>
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com.sleepycat.persist.model</FONT>
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<BR>
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Annotation Type Entity</H2>
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<HR>
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<DL>
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<DT><PRE><FONT SIZE="-1"><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/annotation/Documented.html" title="class or interface in java.lang.annotation">@Documented</A>
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<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/annotation/Retention.html" title="class or interface in java.lang.annotation">@Retention</A>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/annotation/Retention.html#value()" title="class or interface in java.lang.annotation">value</A>=<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/annotation/RetentionPolicy.html#RUNTIME" title="class or interface in java.lang.annotation">RUNTIME</A>)
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<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/annotation/Target.html" title="class or interface in java.lang.annotation">@Target</A>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/annotation/Target.html#value()" title="class or interface in java.lang.annotation">value</A>=<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/annotation/ElementType.html#TYPE" title="class or interface in java.lang.annotation">TYPE</A>)
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</FONT>public @interface <B>Entity</B></DL>
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</PRE>
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<P>
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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 are used to share common definitions and instance
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data. For example, fields in an entity superclass may be defined as primary
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or secondary keys.</p>
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<p>Entity subclasses 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>. Fields in an entity subclass may be
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defined as secondary keys.</p>
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<p>For example, the following <code>BaseClass</code> defines the primary key for
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any number of entity classes, using a single sequence to assign primary key
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values. The entity class <code>Pet</code> extends the base class, implicitly
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defining a primary index that will contain instances of it and its
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subclasses, including <code>Cat</code> which is defined below. The primary key
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(<code>id</code>) and secondary key (<code>name</code>) can be used to retrieve any
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<code>Pet</code> instance.</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>The entity subclass <code>Cat</code> defines a secondary key (<code>finickyness</code>) that only applies to <code>Cat</code> instances. Querying by this
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key will never retrieve a <code>Dog</code> instance, if such a subclass existed,
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because a <code>Dog</code> instance will never contain a <code>finickyness</code>
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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><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></p>
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<li>The wrapper classes for Java primitive types</p>
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<!--
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<li><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/math/BigDecimal.html" title="class or interface in java.math"><CODE>BigDecimal</CODE></A></p>
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-->
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<li><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/math/BigInteger.html" title="class or interface in java.math"><CODE>BigInteger</CODE></A></p>
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<li><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang"><CODE>String</CODE></A></p>
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<li><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Date.html" title="class or interface in java.util"><CODE>Date</CODE></A></p>
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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><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/HashSet.html" title="class or interface in java.util"><CODE>HashSet</CODE></A></li>
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<li><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/TreeSet.html" title="class or interface in java.util"><CODE>TreeSet</CODE></A></li>
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<li><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/HashMap.html" title="class or interface in java.util"><CODE>HashMap</CODE></A></li>
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<li><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/TreeMap.html" title="class or interface in java.util"><CODE>TreeMap</CODE></A></li>
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<li><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/ArrayList.html" title="class or interface in java.util"><CODE>ArrayList</CODE></A></li>
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<li><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/LinkedList.html" title="class or interface in java.util"><CODE>LinkedList</CODE></A></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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<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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<p><strong>Object Graphs</strong></p>
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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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<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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<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>
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<P>
|
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<P>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../../../com/sleepycat/persist/model/Persistent.html" title="annotation in com.sleepycat.persist.model"><CODE>Persistent</CODE></A>,
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|
<A HREF="../../../../com/sleepycat/persist/model/PrimaryKey.html" title="annotation in com.sleepycat.persist.model"><CODE>PrimaryKey</CODE></A>,
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<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></DL>
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<HR>
|
|
|
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<P>
|
|
<!-- =========== ANNOTATION TYPE OPTIONAL MEMBER SUMMARY =========== -->
|
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|
|
<A NAME="annotation_type_optional_element_summary"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
|
|
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
|
|
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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<B>Optional Element Summary</B></FONT></TH>
|
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</TR>
|
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<TR BGCOLOR="white" CLASS="TableRowColor">
|
|
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
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<CODE> int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../../com/sleepycat/persist/model/Entity.html#version()">version</A></B></CODE>
|
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<BR>
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Identifies a new version of a class when an incompatible class change
|
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has been made.</TD>
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</TR>
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</TABLE>
|
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|
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<P>
|
|
<A NAME="version()"><!-- --></A><H3>
|
|
version</H3>
|
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<PRE>
|
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public abstract int <B>version</B></PRE>
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|
<DL>
|
|
<DD>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
|
|
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>
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<P>
|
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<DD><DL>
|
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</DL>
|
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</DD>
|
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<DD><DL>
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</DL>
|
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<DL>
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<DT><B>Default:</B><DD>0</DD>
|
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</DL>
|
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</DL>
|
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<!-- ========= END OF CLASS DATA ========= -->
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<HR>
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<A NAME="navbar_bottom"><!-- --></A>
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