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| <h2 title="Enum BatchFetchType" class="title">Enum BatchFetchType</h2> |
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| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">java.lang.Enum</a><<a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html" title="enum in org.eclipse.persistence.annotations">BatchFetchType</a>></li> |
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| <ul class="inheritance"> |
| <li>org.eclipse.persistence.annotations.BatchFetchType</li> |
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| <pre>public enum <span class="typeNameLabel">BatchFetchType</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a><<a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html" title="enum in org.eclipse.persistence.annotations">BatchFetchType</a>></pre> |
| <div class="block">Enum used with the BatchFetch annotation, or "eclipselink.batch.type" query hint. |
| This can be specified on a mapping or query to configure the type of batch reading to be used.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/eclipse/persistence/annotations/BatchFetch.html" title="annotation in org.eclipse.persistence.annotations"><code>BatchFetch</code></a>, |
| <a href="../../../../org/eclipse/persistence/mappings/ForeignReferenceMapping.html#setBatchFetchType-org.eclipse.persistence.annotations.BatchFetchType-"><code>ForeignReferenceMapping.setBatchFetchType(BatchFetchType)</code></a></dd> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>James Sutherland</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>EclipseLink 2.1</dd> |
| </dl> |
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| <tr> |
| <th class="colOne" scope="col">Enum Constant and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html#EXISTS">EXISTS</a></span></code> |
| <div class="block">This uses an SQL EXISTS and a sub-select in the batch query instead of a join.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html#IN">IN</a></span></code> |
| <div class="block">This uses an SQL IN clause in the batch query passing in the source object Ids.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html#JOIN">JOIN</a></span></code> |
| <div class="block">This is the default form of batch reading.</div> |
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| <td class="colFirst"><code>static <a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html" title="enum in org.eclipse.persistence.annotations">BatchFetchType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html#valueOf-java.lang.String-">valueOf</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name)</code> |
| <div class="block">Returns the enum constant of this type with the specified name.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html" title="enum in org.eclipse.persistence.annotations">BatchFetchType</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html#values--">values</a></span>()</code> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
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| <a name="JOIN"> |
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| <h4>JOIN</h4> |
| <pre>public static final <a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html" title="enum in org.eclipse.persistence.annotations">BatchFetchType</a> JOIN</pre> |
| <div class="block">This is the default form of batch reading. |
| The original query's selection criteria is joined with the batch query.</div> |
| </li> |
| </ul> |
| <a name="EXISTS"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>EXISTS</h4> |
| <pre>public static final <a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html" title="enum in org.eclipse.persistence.annotations">BatchFetchType</a> EXISTS</pre> |
| <div class="block">This uses an SQL EXISTS and a sub-select in the batch query instead of a join. |
| This has the advantage of not requiring an SQL DISTINCT which can have issues |
| with LOBs, or may be more efficient for some types of queries or on some databases.</div> |
| </li> |
| </ul> |
| <a name="IN"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>IN</h4> |
| <pre>public static final <a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html" title="enum in org.eclipse.persistence.annotations">BatchFetchType</a> IN</pre> |
| <div class="block">This uses an SQL IN clause in the batch query passing in the source object Ids. |
| This has the advantage of only selecting the objects not already contained in the cache, |
| and can work better with cursors, or if joins cannot be used. |
| This may only work for singleton Ids on some databases.</div> |
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| <h4>values</h4> |
| <pre>public static <a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html" title="enum in org.eclipse.persistence.annotations">BatchFetchType</a>[] values()</pre> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared. This method may be used to iterate |
| over the constants as follows: |
| <pre> |
| for (BatchFetchType c : BatchFetchType.values()) |
| System.out.println(c); |
| </pre></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
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| <h4>valueOf</h4> |
| <pre>public static <a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html" title="enum in org.eclipse.persistence.annotations">BatchFetchType</a> valueOf(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name)</pre> |
| <div class="block">Returns the enum constant of this type with the specified name. |
| The string must match <i>exactly</i> an identifier used to declare an |
| enum constant in this type. (Extraneous whitespace characters are |
| not permitted.)</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if this enum type has no constant with the specified name</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if the argument is null</dd> |
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