mysql查詢賦值、修改拼接字符串

sql中修改字符串類型的字段可以這么拼接：update tbName set UserName='abc'+UserName;

但mysql中就不行了，需要這樣：update tbName set UserName=CONCAT('abc',UserName);

 

把查詢出來的多個值，賦值給多個變量，

sql：SELECT @oldOrderId=M_ORDERID,@oldParentId=M_PARENTID,@oldOrderPath=M_ORDERPATH FROM S_Menu WHERE M_ID=id;

mysql：SELECT M_ORDERID,M_PARENTID,M_ORDERPATH INTO oldOrderId,oldParentId,oldOrderPath FROM S_Menu WHERE M_ID=id;

sql中聲明變量要加@，mysql中不用加@。