创建concat两列值的触发器时出现语法错误

Question

我正在尝试通过连接两个字段来创建触发器

CREATE TRIGGER format_goods_sn
BEFORE INSERT ON tp_goods
FOR EACH ROW
BEGIN
  SET NEW.goods_sn = CONCAT('TP', LPAD(NEW.goods_id, 7, '0'))
END

但我得到警告说SET NEW.goods_sn = CONCAT('TP', LPAD(NEW.goods_id, 7, '0'))有语法错误？

Answer 1

我发现只使用单行格式（删除'BEGIN'和'END'）就可以解决此问题：

CREATE TRIGGER format_goods_sn
BEFORE INSERT ON tp_goods
FOR EACH ROW
BEGIN
SET NEW.goods_sn = CONCAT('TP', LPAD(NEW.goods_id, 7, '0'))