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| <h2 title="接口 SchemaFactory" class="title">接口 SchemaFactory</h2> |
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| <dt>所有已知实现类:</dt> |
| <dd><a href="../../../../org/apache/calcite/schema/impl/AbstractSchema.Factory.html" title="org.apache.calcite.schema.impl中的类">AbstractSchema.Factory</a>, <a href="../../../../org/apache/calcite/adapter/cassandra/CassandraSchemaFactory.html" title="org.apache.calcite.adapter.cassandra中的类">CassandraSchemaFactory</a>, <a href="../../../../org/apache/calcite/adapter/clone/CloneSchema.Factory.html" title="org.apache.calcite.adapter.clone中的类">CloneSchema.Factory</a>, <a href="../../../../org/apache/calcite/adapter/csv/CsvSchemaFactory.html" title="org.apache.calcite.adapter.csv中的类">CsvSchemaFactory</a>, <a href="../../../../org/apache/calcite/adapter/druid/DruidSchemaFactory.html" title="org.apache.calcite.adapter.druid中的类">DruidSchemaFactory</a>, <a href="../../../../org/apache/calcite/adapter/elasticsearch/ElasticsearchSchemaFactory.html" title="org.apache.calcite.adapter.elasticsearch中的类">ElasticsearchSchemaFactory</a>, <a href="../../../../org/apache/calcite/adapter/file/FileSchemaFactory.html" title="org.apache.calcite.adapter.file中的类">FileSchemaFactory</a>, <a href="../../../../org/apache/calcite/adapter/geode/rel/GeodeSchemaFactory.html" title="org.apache.calcite.adapter.geode.rel中的类">GeodeSchemaFactory</a>, <a href="../../../../org/apache/calcite/adapter/geode/simple/GeodeSimpleSchemaFactory.html" title="org.apache.calcite.adapter.geode.simple中的类">GeodeSimpleSchemaFactory</a>, <a href="../../../../org/apache/calcite/adapter/jdbc/JdbcSchema.Factory.html" title="org.apache.calcite.adapter.jdbc中的类">JdbcSchema.Factory</a>, <a href="../../../../org/apache/calcite/adapter/mongodb/MongoSchemaFactory.html" title="org.apache.calcite.adapter.mongodb中的类">MongoSchemaFactory</a>, <a href="../../../../org/apache/calcite/adapter/pig/PigSchemaFactory.html" title="org.apache.calcite.adapter.pig中的类">PigSchemaFactory</a>, <a href="../../../../org/apache/calcite/adapter/redis/RedisSchemaFactory.html" title="org.apache.calcite.adapter.redis中的类">RedisSchemaFactory</a>, <a href="../../../../org/apache/calcite/adapter/java/ReflectiveSchema.Factory.html" title="org.apache.calcite.adapter.java中的类">ReflectiveSchema.Factory</a>, <a href="../../../../org/apache/calcite/adapter/tpcds/TpcdsSchemaFactory.html" title="org.apache.calcite.adapter.tpcds中的类">TpcdsSchemaFactory</a>, <a href="../../../../org/apache/calcite/adapter/tpch/TpchSchemaFactory.html" title="org.apache.calcite.adapter.tpch中的类">TpchSchemaFactory</a></dd> |
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| <pre>public interface <span class="typeNameLabel">SchemaFactory</span></pre> |
| <div class="block">Factory for <a href="../../../../org/apache/calcite/schema/Schema.html" title="org.apache.calcite.schema中的接口"><code>Schema</code></a> objects. |
| |
| <p>A schema factory allows you to include a custom schema in a model file. |
| For example, here is a model that contains a custom schema whose tables |
| read CSV files. (See the |
| <a href="http://calcite.apache.org/apidocs/org/apache/calcite/adapter/csv/package-summary.html">example CSV adapter</a> |
| for more details about this particular adapter.) |
| |
| <blockquote><pre>{ |
| "version": "1.0", |
| "defaultSchema": "SALES", |
| "schemas": [ |
| { |
| "name": "SALES", |
| "type": "custom", |
| "factory": "org.apache.calcite.adapter.csv.CsvSchemaFactory", |
| "mutable": true, |
| "operand": { |
| directory: "sales" |
| }, |
| "tables": [ |
| { |
| "name": "FEMALE_EMPS", |
| "type": "view", |
| "sql": "SELECT * FROM emps WHERE gender = 'F'" |
| } |
| ] |
| } |
| ] |
| }</pre></blockquote> |
| |
| <p>If you do not wish to allow model authors to add additional tables |
| (including views) to an instance of your schema, specify |
| 'mutable: false'. |
| |
| <p>A class that implements SchemaFactory specified in a schema must have a |
| public default constructor.</div> |
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| <h3>方法概要</h3> |
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| <tr> |
| <th class="colFirst" scope="col">限定符和类型</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/calcite/schema/Schema.html" title="org.apache.calcite.schema中的接口">Schema</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/SchemaFactory.html#create-org.apache.calcite.schema.SchemaPlus-java.lang.String-java.util.Map-">create</a></span>(<a href="../../../../org/apache/calcite/schema/SchemaPlus.html" title="org.apache.calcite.schema中的接口">SchemaPlus</a> parentSchema, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="java.util中的类或接口">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a>> operand)</code> |
| <div class="block">Creates a Schema.</div> |
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| <h4>create</h4> |
| <pre><a href="../../../../org/apache/calcite/schema/Schema.html" title="org.apache.calcite.schema中的接口">Schema</a> create(<a href="../../../../org/apache/calcite/schema/SchemaPlus.html" title="org.apache.calcite.schema中的接口">SchemaPlus</a> parentSchema, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="java.util中的类或接口">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a>> operand)</pre> |
| <div class="block">Creates a Schema.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>parentSchema</code> - Parent schema</dd> |
| <dd><code>name</code> - Name of this schema</dd> |
| <dd><code>operand</code> - The "operand" JSON property</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Created schema</dd> |
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