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
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。