Question

我有以下代码，如果金额为负数，则应抛出异常：

create procedure depositMoney(
        IN acc integer,
        IN amoun integer
    )
    BEGIN
        DECLARE negative CONDITION FOR SQLSTATE '45000';
        IF amoun < 0 THEN SIGNAL negative;
        END IF;
        INSERT INTO account(balance) VALUES amoun where account.number = acc;
    END;

但是当我执行时我有一个＃1064错误：

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 6

你能帮帮我吗？

Answer 1

检查INSERT的语法。

尝试：

DELIMITER //

DROP PROCEDURE IF EXISTS `depositMoney`//

CREATE PROCEDURE `depositMoney` (
  IN `acc` INTEGER,
  IN `amoun` INTEGER
)
BEGIN
  DECLARE `negative` CONDITION FOR SQLSTATE '45000';
  IF `amoun` < 0 THEN
    SIGNAL `negative`
    SET MESSAGE_TEXT = 'An error occurred';
  END IF;
  /*
  Check the syntax of the INSERT.
  INSERT INTO account(balance) VALUES amoun where account.number = acc;
  */
END//

DELIMITER ;

MySQL 5.5或更高版本。

测试：

mysql> CALL `depositMoney`(NULL, -1);
ERROR 1644 (45000): An error occurred

Mysql：在程序中抛出一个异常

1 个答案: