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| <div class="subTitle">org.apache.ignite.cache.query.annotations</div> |
| <h2 title="Annotation Type QuerySqlField" class="title">Annotation Type QuerySqlField</h2> |
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| <pre><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/annotation/Documented.html?is-external=true" title="class or interface in java.lang.annotation">@Documented</a> |
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| public @interface <span class="strong">QuerySqlField</span></pre> |
| <div class="block">Annotates fields for SQL queries. All fields that will be involved in SQL clauses must have |
| this annotation. For more information about cache queries see <code>CacheQuery</code> documentation.</div> |
| <dl><dt><span class="strong">See Also:</span></dt><dd><code>CacheQuery</code></dd></dl> |
| </li> |
| </ul> |
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| <h3>Optional Element Summary</h3> |
| <table class="overviewSummary" 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>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/ignite/cache/query/annotations/QuerySqlField.html#descending()">descending</a></strong></code> |
| <div class="block">Specifies whether index should be in descending order or not.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[]</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/ignite/cache/query/annotations/QuerySqlField.html#groups()">groups</a></strong></code> |
| <div class="block">Array of index groups this field belongs to.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/ignite/cache/query/annotations/QuerySqlField.html#index()">index</a></strong></code> |
| <div class="block">Specifies whether cache should maintain an index for this field or not.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/ignite/cache/query/annotations/QuerySqlField.html#name()">name</a></strong></code> |
| <div class="block">Property name.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/ignite/cache/query/annotations/QuerySqlField.Group.html" title="annotation in org.apache.ignite.cache.query.annotations">QuerySqlField.Group</a>[]</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../../org/apache/ignite/cache/query/annotations/QuerySqlField.html#orderedGroups()">orderedGroups</a></strong></code> |
| <div class="block">Array of ordered index groups this field belongs to.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <!-- ============ ANNOTATION TYPE MEMBER DETAIL =========== --> |
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| <h3>Element Detail</h3> |
| <a name="index()"> |
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| <li class="blockList"> |
| <h4>index</h4> |
| <pre>public abstract boolean index</pre> |
| <div class="block">Specifies whether cache should maintain an index for this field or not. |
| Just like with databases, field indexing may require additional overhead |
| during updates, but makes select operations faster. |
| <p> |
| When indexing SPI and indexed field is |
| of type <code>com.vividsolutions.jts.geom.Geometry</code> (or any subclass of this class) then Ignite will |
| consider this index as spatial providing performance boost for spatial queries.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd><code>True</code> if index must be created for this field in database.</dd></dl> |
| <dl> |
| <dt>Default:</dt> |
| <dd>false</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="descending()"> |
| <!-- --> |
| </a> |
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| <li class="blockList"> |
| <h4>descending</h4> |
| <pre>public abstract boolean descending</pre> |
| <div class="block">Specifies whether index should be in descending order or not. This property only |
| makes sense if <a href="../../../../../../org/apache/ignite/cache/query/annotations/QuerySqlField.html#index()"><code>index()</code></a> property is set to <code>true</code>.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd><code>True</code> if field index should be in descending order.</dd></dl> |
| <dl> |
| <dt>Default:</dt> |
| <dd>false</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="groups()"> |
| <!-- --> |
| </a> |
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| <li class="blockList"> |
| <h4>groups</h4> |
| <pre>public abstract <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] groups</pre> |
| <div class="block">Array of index groups this field belongs to. Groups are used for compound indexes, |
| whenever index should be created on more than one field. All fields within the same |
| group will belong to the same index. |
| <p> |
| Group indexes are needed because SQL engine can utilize only one index per table occurrence in a query. |
| For example if we have two separate indexes on fields <code>a</code> and <code>b</code> of type <code>X</code> then |
| query <code>select * from X where a = ? and b = ?</code> will use for filtering either index on field <code>a</code> |
| or <code>b</code> but not both. For more effective query execution here it is preferable to have a single |
| group index on both fields. |
| <p> |
| For more complex scenarios please refer to <a href="../../../../../../org/apache/ignite/cache/query/annotations/QuerySqlField.Group.html" title="annotation in org.apache.ignite.cache.query.annotations"><code>QuerySqlField.Group</code></a> documentation.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Array of group names.</dd></dl> |
| <dl> |
| <dt>Default:</dt> |
| <dd>{}</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="orderedGroups()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>orderedGroups</h4> |
| <pre>public abstract <a href="../../../../../../org/apache/ignite/cache/query/annotations/QuerySqlField.Group.html" title="annotation in org.apache.ignite.cache.query.annotations">QuerySqlField.Group</a>[] orderedGroups</pre> |
| <div class="block">Array of ordered index groups this field belongs to. For more information please refer to |
| <a href="../../../../../../org/apache/ignite/cache/query/annotations/QuerySqlField.Group.html" title="annotation in org.apache.ignite.cache.query.annotations">QuerySqlField.Group</a> documentation.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Array of ordered group indexes.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../../org/apache/ignite/cache/query/annotations/QuerySqlField.html#groups()"><code>groups()</code></a></dd></dl> |
| <dl> |
| <dt>Default:</dt> |
| <dd>{}</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="name()"> |
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| <h4>name</h4> |
| <pre>public abstract <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name</pre> |
| <div class="block">Property name. If not provided then field name will be used.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Name of property.</dd></dl> |
| <dl> |
| <dt>Default:</dt> |
| <dd>""</dd> |
| </dl> |
| </li> |
| </ul> |
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