195 lines
6.4 KiB
HTML
195 lines
6.4 KiB
HTML
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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">Id</span></pre>
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<div class="block">Specifies the primary key of an entity.
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The field or property to which the <code>Id</code> annotation is applied
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should be one of the following types: any Java primitive type;
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any primitive wrapper type;
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<code>String</code>;
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<code>java.util.Date</code>;
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<code>java.sql.Date</code>;
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<code>java.math.BigDecimal</code>;
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<code>java.math.BigInteger</code>.
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<p>The mapped column for the primary key of the entity is assumed
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to be the primary key of the primary table. If no <code>Column</code> annotation
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is specified, the primary key column name is assumed to be the name
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of the primary key property or field.
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<pre>
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Example:
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@Id
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public Long getId() { return 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/Column.html" title="javax.persistence中的注释"><code>Column</code></a>,
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<a href="../../javax/persistence/GeneratedValue.html" title="javax.persistence中的注释"><code>GeneratedValue</code></a></dd>
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</div>
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<div class="subNav">
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<ul class="navList">
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<li><a href="../../javax/persistence/GenerationType.html" title="javax.persistence中的枚举"><span class="typeNameLink">上一个类</span></a></li>
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<div>
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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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</div>
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