PREPARE
PREPARE 语句为服务器端预处理语句提供 SQL 接口。
语法图
- PreparedStmt
- PrepareSQL
PreparedStmt ::=
'PREPARE' Identifier 'FROM' PrepareSQL
PrepareSQL ::=
stringLit
| UserVariable
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
PREPARE 语句与 MySQL 完全兼容。如发现任何兼容性差异，请尝试 TiDB 支持资源。