sql-statement-prepare.md

title	PREPARE
summary	TiDB 数据库中 PREPARE 的使用概况。
aliases	/docs-cn/dev/sql-statements/sql-statement-prepare/ /docs-cn/dev/reference/sql/statements/prepare/

PREPARE

PREPARE 语句为服务器端预处理语句提供 SQL 接口。

语法图

PreparedStmt ::=
    'PREPARE' Identifier 'FROM' PrepareSQL

PrepareSQL ::=
    stringLit
|   UserVariable

示例

{{< copyable "sql" >}}

PREPARE mystmt FROM 'SELECT ? as num FROM DUAL';

Query OK, 0 rows affected (0.00 sec)

{{< copyable "sql" >}}

SET @number = 5;

Query OK, 0 rows affected (0.00 sec)

{{< copyable "sql" >}}

EXECUTE mystmt USING @number;

+------+
| num  |
+------+
| 5    |
+------+
1 row in set (0.00 sec)

{{< copyable "sql" >}}

DEALLOCATE PREPARE mystmt;

Query OK, 0 rows affected (0.00 sec)

MySQL 兼容性

PREPARE 语句与 MySQL 完全兼容。如发现任何兼容性差异，请在 GitHub 上提交 issue。

另请参阅

• EXECUTE
• DEALLOCATE