mysql - 尽管我尝试了不同的情况，但我的脚本没有运行

Question

下面你可以看到我的脚本，当尝试运行 CREATE PROCEDURE 时，它总是给出语法错误，请告诉我出了什么问题？

我尝试删除“;”在创建过程的 END IF 前面，我还尝试更改 END IF 的位置

CREATE TABLE IF NOT EXISTS parts (
    part_no VARCHAR(18) PRIMARY KEY,
    description VARCHAR(40),
    cost DECIMAL(10 , 2 ) NOT NULL,
    price DECIMAL(10,2) NOT NULL
);

CREATE PROCEDURE `check_parts`(IN cost DECIMAL(10,2), IN price DECIMAL(10,2))
BEGIN
    IF cost < 0 THEN
        SIGNAL SQLSTATE '45000'
            SET MESSAGE_TEXT = 'check constraint on parts.cost failed';
    END IF;

    IF price < 0 THEN
 SIGNAL SQLSTATE '45001'
 SET MESSAGE_TEXT = 'check constraint on parts.price failed';
    END IF;

    IF price < cost THEN
 SIGNAL SQLSTATE '45002'
            SET MESSAGE_TEXT = 'check constraint on parts.price & parts.cost failed';
    END IF;

END

Answer 1

你只需更改分隔符即可，因为在编写的程序中，它将停在第一个“;”

DELIMITER //
CREATE PROCEDURE `check_parts`(IN cost DECIMAL(10,2), IN price DECIMAL(10,2))
BEGIN
    IF cost < 0 THEN
        SIGNAL SQLSTATE '45000'
          SET MESSAGE_TEXT = 'check constraint on parts.cost failed';
    END IF;

    IF price < 0 THEN
      SIGNAL SQLSTATE '45001'
         SET MESSAGE_TEXT = 'check constraint on parts.price failed';
    END IF;

    IF price < cost THEN
       SIGNAL SQLSTATE '45002'
         SET MESSAGE_TEXT = 'check constraint on parts.price & parts.cost failed';
    END IF;

END //
DELIMITER ;

应该可以。