DEALLOCATE
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:
DeallocateSym:
Identifier:
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
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。