Question

请帮助我查询：我在oracle中有下面提到的存储过程，我需要将它转换为MySQL

CREATE OR REPLACE procedure EAMP.EXEC_DDL (SQLSTMT VARCHAR2) AUTHID DEFINER
is
BEGIN
EXECUTE IMMEDIATE SQLSTMT
END EXEC_DDL;
/

这是我在MySQL（版本5.7）中创建的：

DROP PROCEDURE IF EXISTS EXEC_DDL;
CREATE DEFINER=`ampd_own`@`%`
PROCEDURE `ampd01`.`EXEC_DDL`(in SQLSTMT VARCHAR(4000))
BEGIN
set @sql = SQLSTMT;
PREPARE STMT FROM @sql;
EXECUTE STMT;
deallocate prepare STMT;
END;

但它给了我下面提到的错误：

20:08:43  START Executing, Database Connection: EAMP DEV MYSQL Database Type: MYSQL Catalog: ampd01 Schema: null
20:08:47  INFO  Physical database connection acquired for: EAMP DEV MYSQL  
20:08:47  WARNING  [DROP - 0 rows, 0.994 secs]  OK. No rows were affected
SQLWarning: 
Code: 1305 SQL State: 42000 --- PROCEDURE ampd01.EXEC_DDL does not exist  
DROP PROCEDURE IF EXISTS EXEC_DDL;
20:08:48  FAILED  [CREATE - 0 rows, 1.245 secs]  [Code: 1064, SQL State: 
42000]  You have an error in your SQL syntax; check the manual that 
corresponds to your MySQL server version for the right syntax to use near '' 
at line 4  
CREATE DEFINER=`ampd_own`@`%`
PROCEDURE `ampd01`.`EXEC_DDL`(in SQLSTMT VARCHAR(4000))
BEGIN
set @sql = SQLSTMT;
20:08:49  FAILED  [PREPARE - 0 rows, 1.243 secs]  [Code: 1064, SQL State: 
42000]  You have an error in your SQL syntax; check the manual that 
corresponds to your MySQL server version for the right syntax to use near 
'NULL' at line 1  
PREPARE STMT FROM @sql;
20:08:51  FAILED  [EXECUTE - 0 rows, 1.253 secs]  [Code: 1243, SQL State: 
HY000]  Unknown prepared statement handler (STMT) given to EXECUTE  
EXECUTE STMT;
20:08:52  FAILED  [DEALLOCATE - 0 rows, 1.255 secs]  [Code: 1243, SQL State: 
HY000]  Unknown prepared statement handler (STMT) given to DEALLOCATE 
PREPARE  
deallocate prepare STMT;
20:08:53  FAILED  [END - 0 rows, 1.253 secs]  [Code: 1064, SQL State: 42000]  
You have an error in your SQL syntax; check the manual that corresponds to 
your MySQL server version for the right syntax to use near 'END' at line 1  
END;
20:08:55  END Execution 6 statement(s) executed, 0 row(s) affected, 
exec/fetch time: 7.243/0.000 secs   [1 successful, 1 Warnings, 5 errors]*/

Answer 1

在过程体中使用分号，我们需要更改会话的语句分隔符。

例如：

DELIMITER $$

CREATE PROCEDURE foo() 
BEGIN
  SELECT NOW();
END$$

DELIMITER ;

这样，存储过程中出现的分号不会结束CREATE语句。我们可以在完成后将语句分隔符更改为分号。

修改的

以下是对报告输出的分析：

本声明

DROP PROCEDURE IF EXISTS EXEC_DDL;

成功完成，发出警告＆＃34;程序不存在＆＃34;

执行的下一个声明是：

CREATE DEFINER=`ampd_own`@`%`
PROCEDURE `ampd01`.`EXEC_DDL`(in SQLSTMT VARCHAR(4000))
BEGIN
set @sql = SQLSTMT;

MySQL返回语法错误;这是预期的行为，因为它不是有效的SQL语句。下一个声明已执行：

PREPARE STMT FROM @sql;

返回错误，因为@sql评估为NULL。下一个语句已执行

EXECUTE STMT;

失败，因为STMT不是有效的语句句柄。（因为PREPARE失败了。）

我们不希望将SET和PREPARE作为单独的语句执行，我们希望这些语句成为CREATE PROCEDURE语句的一部分。

问题是分号字符是语句终止符;我们需要将语句终止符更改为其他字符串，而不是在CREATE PROCEDURE的正文中出现的字符串。

关注

参考：https://dev.mysql.com/doc/refman/5.7/en/stored-programs-defining.html

这是使用MySQL命令行客户端

的演示

# mysql --defaults-extra-file=/opt/mysql/scripts/config.cnf --database test

mysql> DELIMITER $$

mysql> DROP PROCEDURE IF EXISTS foo $$
Query OK, 0 rows affected (0.06 sec)

mysql> DROP PROCEDURE IF EXISTS foo $$
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> CREATE PROCEDURE foo()
    -> BEGIN
    ->   SELECT NOW();
    -> END$$
Query OK, 0 rows affected (0.00 sec)

mysql> DELIMITER ;

mysql> CALL foo();
+---------------------+
| NOW()               |
+---------------------+
| 2018-06-13 13:33:33 |
+---------------------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

mysql> exit

mysql：将sql语句作为参数传递给存储过程来执行它

1 个答案: