(5)创建入库表出库表上的六个触发器。mysql的代码
时间: 2024-04-30 22:20:49 浏览: 6
以下是 MySQL 数据库中创建入库表和出库表的六个触发器的代码示例:
创建入库表的三个触发器:
1. 在插入入库记录时,更新库存表中对应商品的数量:
```
DELIMITER //
CREATE TRIGGER update_inventory_on_insert
AFTER INSERT ON in_stock
FOR EACH ROW
BEGIN
UPDATE inventory
SET quantity = quantity + NEW.quantity
WHERE inventory.product_id = NEW.product_id;
END //
DELIMITER ;
```
2. 在更新入库记录时,更新库存表中对应商品的数量:
```
DELIMITER //
CREATE TRIGGER update_inventory_on_update
AFTER UPDATE ON in_stock
FOR EACH ROW
BEGIN
UPDATE inventory
SET quantity = quantity + NEW.quantity - OLD.quantity
WHERE inventory.product_id = NEW.product_id;
END //
DELIMITER ;
```
3. 在删除入库记录时,更新库存表中对应商品的数量:
```
DELIMITER //
CREATE TRIGGER update_inventory_on_delete
AFTER DELETE ON in_stock
FOR EACH ROW
BEGIN
UPDATE inventory
SET quantity = quantity - OLD.quantity
WHERE inventory.product_id = OLD.product_id;
END //
DELIMITER ;
```
创建出库表的三个触发器:
4. 在插入出库记录时,更新库存表中对应商品的数量:
```
DELIMITER //
CREATE TRIGGER update_inventory_on_outsert
AFTER INSERT ON out_stock
FOR EACH ROW
BEGIN
UPDATE inventory
SET quantity = quantity - NEW.quantity
WHERE inventory.product_id = NEW.product_id;
END //
DELIMITER ;
```
5. 在更新出库记录时,更新库存表中对应商品的数量:
```
DELIMITER //
CREATE TRIGGER update_inventory_on_outupdate
AFTER UPDATE ON out_stock
FOR EACH ROW
BEGIN
UPDATE inventory
SET quantity = quantity - NEW.quantity + OLD.quantity
WHERE inventory.product_id = NEW.product_id;
END //
DELIMITER ;
```
6. 在删除出库记录时,更新库存表中对应商品的数量:
```
DELIMITER //
CREATE TRIGGER update_inventory_on_outdelete
AFTER DELETE ON out_stock
FOR EACH ROW
BEGIN
UPDATE inventory
SET quantity = quantity + OLD.quantity
WHERE inventory.product_id = OLD.product_id;
END //
DELIMITER ;
```
请注意,以上代码仅供参考,具体的触发器代码需要根据实际业务逻辑和数据库结构进行调整。