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

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

MySQL 兼容性

DEALLOCATE 语句与 MySQL 完全兼容。如有任何兼容性差异,请在 GitHub 上提交 issue

另请参阅