201 lines
6.6 KiB
HTML
201 lines
6.6 KiB
HTML
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<li>概要: </li>
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<li>字段 | </li>
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<li>必需 | </li>
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<li>可选</li>
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<li>详细资料: </li>
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<li>字段 | </li>
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<li>元素</li>
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<div class="subTitle">javax.persistence</div>
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<h2 title="注释类型 GeneratedValue" class="title">注释类型 GeneratedValue</h2>
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<pre>@Target(value={METHOD,FIELD})
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@Retention(value=RUNTIME)
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public @interface <span class="memberNameLabel">GeneratedValue</span></pre>
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<div class="block">Provides for the specification of generation strategies for the
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values of primary keys.
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<p>
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The <code>GeneratedValue</code> annotation
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may be applied to a primary key property or field of an entity or
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mapped superclass in conjunction with the <a href="../../javax/persistence/Id.html" title="javax.persistence中的注释"><code>Id</code></a> annotation.
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The use of the <code>GeneratedValue</code> annotation is only
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required to be supported for simple primary keys. Use of the
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<code>GeneratedValue</code> annotation is not supported for derived
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primary keys.
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<pre>
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Example 1:
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@Id
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@GeneratedValue(strategy=SEQUENCE, generator="CUST_SEQ")
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@Column(name="CUST_ID")
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public Long getId() { return id; }
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Example 2:
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@Id
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@GeneratedValue(strategy=TABLE, generator="CUST_GEN")
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@Column(name="CUST_ID")
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Long id;
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</pre></div>
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<dl>
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<dt><span class="simpleTagLabel">从以下版本开始:</span></dt>
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<dd>Java Persistence 1.0</dd>
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<dt><span class="seeLabel">另请参阅:</span></dt>
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<dd><a href="../../javax/persistence/Id.html" title="javax.persistence中的注释"><code>Id</code></a></dd>
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<ul class="subNavList">
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<li>概要: </li>
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<li>字段 | </li>
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<li>必需 | </li>
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<li>可选</li>
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</ul>
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<ul class="subNavList">
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<li>详细资料: </li>
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<li>字段 | </li>
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<li>元素</li>
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</ul>
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