jakartaee-9.0/javadoc/jakarta/persistence/Index.html - tomee-site-pub - Git at Google

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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>
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 <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>
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 <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>
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 <h4>columnList</h4>
 <pre>public abstract&nbsp;java.lang.String&nbsp;columnList</pre>
 <div class="block">(Required) The names of the columns to be included in the index,
  in order.</div>
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 <pre>public abstract&nbsp;java.lang.String&nbsp;name</pre>
 <div class="block">(Optional) The name of the index; defaults to a provider-generated name.</div>
 <dl>
 <dt>Default:</dt>
 <dd>""</dd>
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 <pre>public abstract&nbsp;boolean&nbsp;unique</pre>
 <div class="block">(Optional) Whether the index is unique.</div>
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 <dt>Default:</dt>
 <dd>false</dd>
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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>
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	<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>
	</li>
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	<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>
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	<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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	<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>
	</li>
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	<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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