mysql insert update语句

执行这条语句，会帮你自动判断数据库中是否有与你要插入的记录重复主键，

有则更新，没有就插入

格式如：insert into tablename(字段1，字段2) select * from

(select 字段1, 字段2,.... from dual) as b on duplicate key update字段1=b.字段1,....

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例子：insert into trtb_dim_top_cats

(cid,parent_cid,name,is_parent,status,sort_order,lev)

select * from (select cid, parent_cid, name, is_parent, status, sort_order,

lev from dual)

as b on duplicate key update

cid=b.cid,parent_cid=b.parent_cid,name=b.name,is_parent=b.is_parent,status=b.status,
sort_order=b.sort_order,lev=b.lev