mysql 中每行的命令

Question

帮我 please.I 想在 mysql 服务器中创建触发器，但服务器写信给我

SQL 查询：文档

CREATE TRIGGER `dis_out_of_stock` AFTER UPDATE ON `ps_stock_available`
FOR EACH ROW 
begin
UPDATE `ps_product_shop` SET active=0 WHERE id_product IN (SELECT 
id_product FROM `ps_stock_available` WHERE quantity=0);

MySQL 说：文档

1064 - 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

这是我的代码：

在 ps_stock_available

dis_out_of_stock

每行
开始
更新ps_product_shop SET active=0 WHERE id_product IN (SELECT id_product FROM ps_stock_available WHERE quantity=0);
更新ps_product_shop SET active=1 WHERE id_product IN (SELECT id_product FROM ps_stock_available WHERE quantity>0);
结束

谢谢，祝你有愉快的一天。

Answer 1

您需要将 DELIMITER 重新定义为 ; 以外的其他内容，例如：$$
此外，使用 DROP TRIGGER IF EXISTS.
最后，将DELIMITER重新定义为;

尝试：

DELIMITER $$
DROP TRIGGER IF EXISTS dis_out_of_stock $$
CREATE TRIGGER dis_out_of_stock 
  AFTER UPDATE ON ps_stock_available 
    FOR EACH ROW begin 

      UPDATE ps_product_shop 
      SET active=0 
      WHERE id_product IN (SELECT id_product 
                           FROM ps_stock_available 
                           WHERE quantity = 0);
END $$
DELIMITER ;

Answer 2

您不应尝试更新整个 ps_product_shop table。相反，只需查看刚刚修改的记录：

DELIMTER $$

CREATE TRIGGER `dis_out_of_stock` AFTER UPDATE ON `ps_stock_available`
FOR EACH ROW 
BEGIN
    UPDATE ps_product_shop ps 
        SET active = 0
        WHERE ps.id_product = new.id_product and new.quantity = 0;
END;

DELIMITER ;

mysql 中每行的命令

Command FOR EACH ROW in mysql

mysql

sql

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