PREPARE

PREPARE 语句为服务器端预处理语句提供 SQL 接口。

语法图

PreparedStmt

PrepareSQL

1. PreparedStmt ::=
2. 'PREPARE' Identifier 'FROM' PrepareSQL

4. PrepareSQL ::=
5. stringLit
6. |   UserVariable

示例

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

1. Query OK, 0 rows affected (0.00 sec)

1. SET @number = 5;

1. Query OK, 0 rows affected (0.00 sec)

1. EXECUTE mystmt USING @number;

1. +------+
2. | num  |
3. +------+
4. | 5    |
5. +------+
6. 1 row in set (0.00 sec)

1. DEALLOCATE PREPARE mystmt;

1. 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