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39 lines
1.1 KiB
Markdown
39 lines
1.1 KiB
Markdown
---
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toc_priority: 43
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toc_title: jdbc
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---
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# jdbc {#table-function-jdbc}
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`jdbc(datasource, schema, table)` -返回通过JDBC驱动程序连接的表。
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此表函数需要单独的 [clickhouse-jdbc-bridge](https://github.com/ClickHouse/clickhouse-jdbc-bridge) 程序才能运行。
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它支持可空类型（基于查询的远程表的DDL）。
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**示例**
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``` sql
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SELECT * FROM jdbc('jdbc:mysql://localhost:3306/?user=root&password=root', 'schema', 'table')
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```
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``` sql
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SELECT * FROM jdbc('mysql://localhost:3306/?user=root&password=root', 'select * from schema.table')
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```
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``` sql
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SELECT * FROM jdbc('mysql-dev?p1=233', 'num Int32', 'select toInt32OrZero(''{{p1}}'') as num')
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```
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``` sql
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SELECT *
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FROM jdbc('mysql-dev?p1=233', 'num Int32', 'select toInt32OrZero(''{{p1}}'') as num')
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```
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``` sql
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SELECT a.datasource AS server1, b.datasource AS server2, b.name AS db
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FROM jdbc('mysql-dev?datasource_column', 'show databases') a
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INNER JOIN jdbc('self?datasource_column', 'show databases') b ON a.Database = b.name
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```
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[原始文章](https://clickhouse.tech/docs/en/query_language/table_functions/jdbc/) <!--hide-->
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