DEALLOCATE

DEALLOCATE 语句用于为服务器端预处理语句提供 SQL 接口。

语法图

DeallocateStmt:

DeallocateStmt

DeallocateSym:

DeallocateSym

Identifier:

Identifier

示例

mysql> PREPARE mystmt FROM 'SELECT ? as num FROM DUAL'; Query OK, 0 rows affected (0.00 sec) mysql> SET @number = 5; Query OK, 0 rows affected (0.00 sec) mysql> EXECUTE mystmt USING @number; +------+ | num | +------+ | 5 | +------+ 1 row in set (0.00 sec) mysql> DEALLOCATE PREPARE mystmt; Query OK, 0 rows affected (0.00 sec)

MySQL 兼容性

DEALLOCATE 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

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