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| <h1 title="程序包" class="title">程序包 org.apache.calcite.model</h1> |
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| <div class="block">Provides model files, in JSON format, defining schemas and other metadata.</div> |
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| <p>请参阅: <a href="#package.description">说明</a></p> |
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| <th class="colFirst" scope="col">类</th> |
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| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonColumn.html" title="org.apache.calcite.model中的类">JsonColumn</a></td> |
| <td class="colLast"> |
| <div class="block">JSON object representing a column.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonCustomSchema.html" title="org.apache.calcite.model中的类">JsonCustomSchema</a></td> |
| <td class="colLast"> |
| <div class="block">JSON schema element that represents a custom schema.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonCustomTable.html" title="org.apache.calcite.model中的类">JsonCustomTable</a></td> |
| <td class="colLast"> |
| <div class="block">Custom table schema element.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonFunction.html" title="org.apache.calcite.model中的类">JsonFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Function schema element.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonJdbcSchema.html" title="org.apache.calcite.model中的类">JsonJdbcSchema</a></td> |
| <td class="colLast"> |
| <div class="block">JSON object representing a schema that maps to a JDBC database.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonLattice.html" title="org.apache.calcite.model中的类">JsonLattice</a></td> |
| <td class="colLast"> |
| <div class="block">Element that describes a star schema and provides a framework for defining, |
| recognizing, and recommending materialized views at various levels of |
| aggregation.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonMapSchema.html" title="org.apache.calcite.model中的类">JsonMapSchema</a></td> |
| <td class="colLast"> |
| <div class="block">JSON object representing a schema whose tables are explicitly specified.</div> |
| </td> |
| </tr> |
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| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonMaterialization.html" title="org.apache.calcite.model中的类">JsonMaterialization</a></td> |
| <td class="colLast"> |
| <div class="block">Element that describes how a table is a materialization of a query.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonMeasure.html" title="org.apache.calcite.model中的类">JsonMeasure</a></td> |
| <td class="colLast"> |
| <div class="block">An aggregate function applied to a column (or columns) of a lattice.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonRoot.html" title="org.apache.calcite.model中的类">JsonRoot</a></td> |
| <td class="colLast"> |
| <div class="block">Root schema element.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonSchema.html" title="org.apache.calcite.model中的类">JsonSchema</a></td> |
| <td class="colLast"> |
| <div class="block">Schema schema element.</div> |
| </td> |
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| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonStream.html" title="org.apache.calcite.model中的类">JsonStream</a></td> |
| <td class="colLast"> |
| <div class="block">Information about whether a table allows streaming.</div> |
| </td> |
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| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonTable.html" title="org.apache.calcite.model中的类">JsonTable</a></td> |
| <td class="colLast"> |
| <div class="block">Table schema element.</div> |
| </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonTile.html" title="org.apache.calcite.model中的类">JsonTile</a></td> |
| <td class="colLast"> |
| <div class="block">Materialized view within a <a href="../../../../org/apache/calcite/model/JsonLattice.html" title="org.apache.calcite.model中的类"><code>JsonLattice</code></a>.</div> |
| </td> |
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| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonType.html" title="org.apache.calcite.model中的类">JsonType</a></td> |
| <td class="colLast"> |
| <div class="block">Type schema element.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonTypeAttribute.html" title="org.apache.calcite.model中的类">JsonTypeAttribute</a></td> |
| <td class="colLast"> |
| <div class="block">JSON object representing a type attribute.</div> |
| </td> |
| </tr> |
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| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonView.html" title="org.apache.calcite.model中的类">JsonView</a></td> |
| <td class="colLast"> |
| <div class="block">View schema element.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/ModelHandler.html" title="org.apache.calcite.model中的类">ModelHandler</a></td> |
| <td class="colLast"> |
| <div class="block">Reads a model and creates schema objects accordingly.</div> |
| </td> |
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| <td class="colFirst"><a href="../../../../org/apache/calcite/model/JsonSchema.Type.html" title="org.apache.calcite.model中的枚举">JsonSchema.Type</a></td> |
| <td class="colLast"> |
| <div class="block">Built-in schema types.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/calcite/model/ModelHandler.ExtraOperand.html" title="org.apache.calcite.model中的枚举">ModelHandler.ExtraOperand</a></td> |
| <td class="colLast"> |
| <div class="block">Extra operands automatically injected into a |
| <a href="../../../../org/apache/calcite/model/JsonCustomSchema.html#operand"><code>JsonCustomSchema.operand</code></a>, as extra context for the adapter.</div> |
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| <h2 title="程序包org.apache.calcite.model的说明">程序包org.apache.calcite.model的说明</h2> |
| <div class="block">Provides model files, in JSON format, defining schemas and other metadata. |
| |
| <p>Models are specified using a <code>model=<uri></code> parameter on |
| the JDBC connect string. Calcite loads the model while initializing the |
| connection. It first parses the JSON, then uses a |
| <a href="../../../../org/apache/calcite/model/ModelHandler.html" title="org.apache.calcite.model中的类"><code>ModelHandler</code></a> as visitor over the parse |
| tree.</p> |
| |
| <p>There are standard implementations of schema and table, but the user can |
| provide their own by implementing the |
| <a href="../../../../org/apache/calcite/schema/SchemaFactory.html" title="org.apache.calcite.schema中的接口"><code>SchemaFactory</code></a> |
| or <a href="../../../../org/apache/calcite/schema/TableFactory.html" title="org.apache.calcite.schema中的接口"><code>TableFactory</code></a> |
| interfaces and including a custom schema in the model.</p> |
| |
| <p>There are several examples of schemas in the |
| <a href="https://calcite.apache.org/docs/tutorial.html">tutorial</a>.</div> |
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