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| <div class="subTitle">org.apache.calcite.linq4j</div> |
| <h2 title="接口 QueryProvider" class="title">接口 QueryProvider</h2> |
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| <div class="description"> |
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| <dl> |
| <dt>所有已知子接口:</dt> |
| <dd><a href="../../../../org/apache/calcite/jdbc/CalciteConnection.html" title="org.apache.calcite.jdbc中的接口">CalciteConnection</a></dd> |
| </dl> |
| <dl> |
| <dt>所有已知实现类:</dt> |
| <dd><a href="../../../../org/apache/calcite/adapter/jdbc/JdbcQueryProvider.html" title="org.apache.calcite.adapter.jdbc中的类">JdbcQueryProvider</a>, <a href="../../../../org/apache/calcite/linq4j/QueryProviderImpl.html" title="org.apache.calcite.linq4j中的类">QueryProviderImpl</a></dd> |
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| <pre>public interface <span class="typeNameLabel">QueryProvider</span></pre> |
| <div class="block">Defines methods to create and execute queries that are described by a |
| <a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口"><code>Queryable</code></a> object. |
| |
| <p>Analogous to LINQ's System.Linq.QueryProvider.</p></div> |
| </li> |
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| <h3>方法概要</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="方法概要表, 列表方法和解释"> |
| <caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">抽象方法</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">限定符和类型</th> |
| <th class="colLast" scope="col">方法和说明</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><T> <a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口">Queryable</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/linq4j/QueryProvider.html#createQuery-org.apache.calcite.linq4j.tree.Expression-java.lang.Class-">createQuery</a></span>(<a href="../../../../org/apache/calcite/linq4j/tree/Expression.html" title="org.apache.calcite.linq4j.tree中的类">Expression</a> expression, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a><T> rowType)</code> |
| <div class="block">Constructs a <a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口"><code>Queryable</code></a> object that can evaluate the query |
| represented by a specified expression tree.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><T> <a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口">Queryable</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/linq4j/QueryProvider.html#createQuery-org.apache.calcite.linq4j.tree.Expression-java.lang.reflect.Type-">createQuery</a></span>(<a href="../../../../org/apache/calcite/linq4j/tree/Expression.html" title="org.apache.calcite.linq4j.tree中的类">Expression</a> expression, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="java.lang.reflect中的类或接口">Type</a> rowType)</code> |
| <div class="block">Constructs a <a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口"><code>Queryable</code></a> object that can evaluate the query |
| represented by a specified expression tree.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><T> T</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/linq4j/QueryProvider.html#execute-org.apache.calcite.linq4j.tree.Expression-java.lang.Class-">execute</a></span>(<a href="../../../../org/apache/calcite/linq4j/tree/Expression.html" title="org.apache.calcite.linq4j.tree中的类">Expression</a> expression, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a><T> type)</code> |
| <div class="block">Executes the query represented by a specified expression tree.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><T> T</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/linq4j/QueryProvider.html#execute-org.apache.calcite.linq4j.tree.Expression-java.lang.reflect.Type-">execute</a></span>(<a href="../../../../org/apache/calcite/linq4j/tree/Expression.html" title="org.apache.calcite.linq4j.tree中的类">Expression</a> expression, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="java.lang.reflect中的类或接口">Type</a> type)</code> |
| <div class="block">Executes the query represented by a specified expression tree.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><T> <a href="../../../../org/apache/calcite/linq4j/Enumerator.html" title="org.apache.calcite.linq4j中的接口">Enumerator</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/linq4j/QueryProvider.html#executeQuery-org.apache.calcite.linq4j.Queryable-">executeQuery</a></span>(<a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口">Queryable</a><T> queryable)</code> |
| <div class="block">Executes a queryable, and returns an enumerator over the |
| rows that it yields.</div> |
| </td> |
| </tr> |
| </table> |
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| <h3>方法详细资料</h3> |
| <a name="createQuery-org.apache.calcite.linq4j.tree.Expression-java.lang.Class-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>createQuery</h4> |
| <pre><T> <a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口">Queryable</a><T> createQuery(<a href="../../../../org/apache/calcite/linq4j/tree/Expression.html" title="org.apache.calcite.linq4j.tree中的类">Expression</a> expression, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a><T> rowType)</pre> |
| <div class="block">Constructs a <a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口"><code>Queryable</code></a> object that can evaluate the query |
| represented by a specified expression tree. |
| |
| <p>NOTE: The <a href="../../../../org/apache/calcite/linq4j/RawQueryable.html#getExpression--"><code>RawQueryable.getExpression()</code></a> |
| property of the returned <a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口"><code>Queryable</code></a> object is equal to |
| <code>expression</code>.</p></div> |
| <dl> |
| <dt><span class="paramLabel">类型参数:</span></dt> |
| <dd><code>T</code> - Row type</dd> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>expression</code> - Expression</dd> |
| <dd><code>rowType</code> - Row type</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Queryable</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="createQuery-org.apache.calcite.linq4j.tree.Expression-java.lang.reflect.Type-"> |
| <!-- --> |
| </a> |
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| <h4>createQuery</h4> |
| <pre><T> <a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口">Queryable</a><T> createQuery(<a href="../../../../org/apache/calcite/linq4j/tree/Expression.html" title="org.apache.calcite.linq4j.tree中的类">Expression</a> expression, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="java.lang.reflect中的类或接口">Type</a> rowType)</pre> |
| <div class="block">Constructs a <a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口"><code>Queryable</code></a> object that can evaluate the query |
| represented by a specified expression tree. The row type may contain |
| generic information.</div> |
| <dl> |
| <dt><span class="paramLabel">类型参数:</span></dt> |
| <dd><code>T</code> - Row type</dd> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>expression</code> - Expression</dd> |
| <dd><code>rowType</code> - Row type</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Queryable</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="execute-org.apache.calcite.linq4j.tree.Expression-java.lang.Class-"> |
| <!-- --> |
| </a> |
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| <h4>execute</h4> |
| <pre><T> T execute(<a href="../../../../org/apache/calcite/linq4j/tree/Expression.html" title="org.apache.calcite.linq4j.tree中的类">Expression</a> expression, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="java.lang中的类或接口">Class</a><T> type)</pre> |
| <div class="block">Executes the query represented by a specified expression tree. |
| |
| <p>This method executes queries that return a single value |
| (instead of an enumerable sequence of values). Expression trees that |
| represent queries that return enumerable results are executed when the |
| <a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口"><code>Queryable</code></a> object that contains the expression tree is |
| enumerated.</p> |
| |
| <p>The Queryable standard query operator methods that return singleton |
| results call <code>execute</code>. They pass it a |
| <a href="../../../../org/apache/calcite/linq4j/tree/MethodCallExpression.html" title="org.apache.calcite.linq4j.tree中的类"><code>MethodCallExpression</code></a> |
| that represents a linq4j query.</div> |
| </li> |
| </ul> |
| <a name="execute-org.apache.calcite.linq4j.tree.Expression-java.lang.reflect.Type-"> |
| <!-- --> |
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| <h4>execute</h4> |
| <pre><T> T execute(<a href="../../../../org/apache/calcite/linq4j/tree/Expression.html" title="org.apache.calcite.linq4j.tree中的类">Expression</a> expression, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="java.lang.reflect中的类或接口">Type</a> type)</pre> |
| <div class="block">Executes the query represented by a specified expression tree. |
| The row type may contain type parameters.</div> |
| </li> |
| </ul> |
| <a name="executeQuery-org.apache.calcite.linq4j.Queryable-"> |
| <!-- --> |
| </a> |
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| <h4>executeQuery</h4> |
| <pre><T> <a href="../../../../org/apache/calcite/linq4j/Enumerator.html" title="org.apache.calcite.linq4j中的接口">Enumerator</a><T> executeQuery(<a href="../../../../org/apache/calcite/linq4j/Queryable.html" title="org.apache.calcite.linq4j中的接口">Queryable</a><T> queryable)</pre> |
| <div class="block">Executes a queryable, and returns an enumerator over the |
| rows that it yields.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>queryable</code> - Queryable</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Enumerator over rows</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
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