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| <pre>@Target(value={}) |
| @Retention(value=RUNTIME) |
| public @interface <span class="memberNameLabel">Index</span></pre> |
| <div class="block">Used in schema generation to specify creation of an index. |
| <p> |
| Note that it is not necessary to specify an index for a primary key, |
| as the primary key index will be created automatically. |
| |
| <p> |
| The syntax of the <code>columnList</code> element is a |
| <code>column_list</code>, as follows: |
| |
| <pre> |
| column::= index_column [,index_column]* |
| index_column::= column_name [ASC | DESC] |
| </pre> |
| |
| <p> If <code>ASC</code> or <code>DESC</code> is not specified, |
| <code>ASC</code> (ascending order) is assumed.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.1</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../jakarta/persistence/Table.html" title="annotation in jakarta.persistence"><code>Table</code></a>, |
| <a href="../../jakarta/persistence/SecondaryTable.html" title="annotation in jakarta.persistence"><code>SecondaryTable</code></a>, |
| <a href="../../jakarta/persistence/CollectionTable.html" title="annotation in jakarta.persistence"><code>CollectionTable</code></a>, |
| <a href="../../jakarta/persistence/JoinTable.html" title="annotation in jakarta.persistence"><code>JoinTable</code></a>, |
| <a href="../../jakarta/persistence/TableGenerator.html" title="annotation in jakarta.persistence"><code>TableGenerator</code></a></dd> |
| </dl> |
| </li> |
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| <h3>Required Element Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Required Element Summary table, listing required elements, and an explanation"> |
| <caption><span>Required Elements</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Required Element and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/Index.html#columnList--">columnList</a></span></code> |
| <div class="block">(Required) The names of the columns to be included in the index, |
| in order.</div> |
| </td> |
| </tr> |
| </table> |
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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"> |
| <caption><span>Optional Elements</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Optional Element and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/Index.html#name--">name</a></span></code> |
| <div class="block">(Optional) The name of the index; defaults to a provider-generated name.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/Index.html#unique--">unique</a></span></code> |
| <div class="block">(Optional) Whether the index is unique.</div> |
| </td> |
| </tr> |
| </table> |
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| </ul> |
| </li> |
| </ul> |
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| <h3>Element Detail</h3> |
| <a name="columnList--"> |
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| <ul class="blockListLast"> |
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| <h4>columnList</h4> |
| <pre>public abstract java.lang.String columnList</pre> |
| <div class="block">(Required) The names of the columns to be included in the index, |
| in order.</div> |
| </li> |
| </ul> |
| </li> |
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| <h4>name</h4> |
| <pre>public abstract java.lang.String name</pre> |
| <div class="block">(Optional) The name of the index; defaults to a provider-generated name.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>""</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>unique</h4> |
| <pre>public abstract boolean unique</pre> |
| <div class="block">(Optional) Whether the index is unique.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>false</dd> |
| </dl> |
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