Question

我想创建一个TRIGGER AFTER UPDATE，它将TABLE_1中刚刚更新的行复制到TABLE_2。

此代码在更新多行后引发错误：SQL错误（1062）：键'PRIMARY'重复输入'1'

我知道这段代码不对，但我不知道如何操作已更新的行。

CREATE DEFINER=`companyERP`@`%` TRIGGER `trigger` AFTER INSERT ON `Table_1`
FOR EACH ROW BEGIN
INSERT INTO Table_2 SELECT *
FROM Table_1;
END

提前感谢您的帮助。

Answer 1

CREATE DEFINER=`companyERP`@`%` TRIGGER `trigger` AFTER INSERT ON `Table_1`
FOR EACH ROW BEGIN
INSERT INTO Table_2 SELECT new.Field1, newField2 ...
FROM Table_1
END

Answer 2

尝试：

/*
CREATE DEFINER=`companyERP`@`%` TRIGGER `trigger` AFTER INSERT ON `Table_1`
FOR EACH ROW BEGIN
INSERT INTO Table_2 SELECT *
FROM Table_1;
END
*/

DELIMITER //

CREATE TRIGGER `trigger` AFTER UPDATE ON `Table_1`
FOR EACH ROW
BEGIN
  INSERT INTO `Table_2`
    (`id_table_1`, `old_value`, `created_at`)
  VALUES
    (OLD.`id`, OLD.`value`, NOW());
END//

DELIMITER ;

SQL Fiddle demo

更新后触发 - 复制到另一个表

2 个答案: