触发器插入到多个表中

Question

我有 2 个 table 命名为：train_information 和 axle.

Train_information

有以下内容：

train_id (PK)
train_name
train_length
number_of_axles

axle

有以下内容：

axle_id (PK)
train_id(FK)
axle

当我在 train_information 上插入一些内容时，例如将数字 16 放入 number_of_axles。我希望 table axle 自动获取相同的信息。

如何使用触发器执行此操作？

编辑：

现在可以使用此代码：

CREATE TRIGGER TriggerName AFTER INSERT ON train_information
FOR EACH
ROW 
BEGIN 
INSERT INTO axle( train_id, axle ) 
VALUES (
NEW.train_id, NEW.number_of_axles
);

END

但是现在，它在 table axle 中输入例如数字 16 但我希望它像这样：

axle_id = 1
train_id = 1
axle = 1

axle_id = 2
train_id = 1
axle = 2

axle_id = 3
train_id = 1
axle = 3

这可能吗？

Answer 1

您可以在 Train_information table 上创建 AFTER TRIGGER，如下所示：

SQL 更多关于After Triggers in SQL

CREATE TRIGGER TriggerName
   ON Train_information
   FOR INSERT
   AS
   BEGIN
      SET NOCOUNT ON
      INSERT INTO axle
        (train_id, axle)
    SELECT
        train_id, 'axle_name'
        FROM inserted
    END

MySQL 更多关于After Triggers in MySQL

DELIMITER $$
CREATE TRIGGER TriggerName
   AFTER INSERT ON Train_information FOR EACH ROW
   BEGIN
      INSERT INTO axle (train_id, axle)
      VALUES (NEW.train_id, NEW.axle_name)            
    END;
$$
DELIMITER ;

触发器插入到多个表中

Trigger insert into multiple tables

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