觸發器報錯“Not allowed to return a result set from a trigger”的解決方案

創建觸發器語句如下：

CREATE TRIGGER newproduct AFTER INSERT ON products
FOR EACH ROW SELECT 'Product added' ;

此時報錯：
Not allowed to return a result set from a trigger

解決方法：加上 into @ee，因為從MySQL5以后不支持觸發器返回結果集

CREATE TRIGGER newproduct AFTER INSERT ON products
FOR EACH ROW SELECT 'Product added' INTO @ee;