MYSQL 插入时判断重复就不插入,不影响原记录 - V2EX
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MYSQL 插入时判断重复就不插入,不影响原记录

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  •   eabet 2016-12-20 20:49:54 +08:00 4594 次点击
    这是一个创建于 3291 天前的主题,其中的信息可能已经有所发展或是发生改变。
    用 REPLACE INTO 的话是更新,有没有办法不影响原记录呢?
    11 条回复    2016-12-21 23:01:56 +08:00
    julyclyde
        1
    julyclyde  
       2016-12-20 21:23:47 +08:00
    insert ignore?
    billlee
        2
    billlee  
       2016-12-20 21:49:09 +08:00
    那你为什么用 REPLACE 干嘛,用 INSERT
    north521
        3
    north521  
       2016-12-20 21:59:55 +08:00
    ON DUPLICATE KEY UPDATE
    inaho
        4
    inaho  
       2016-12-20 22:01:58 +08:00
    楼上+1 , 加个唯一索引
    TaMud
        5
    TaMud  
       2016-12-20 22:17:05 +08:00
    1 、唯一索引
    2 、 WHERE NOT EXISTS
    darrenfang
        6
    darrenfang  
       2016-12-21 07:47:21 +08:00 via iPhone
    insert ignore
    wwulfric
        7
    wwulfric  
       2016-12-21 10:39:36 +08:00
    唯一索引会报错啊
    Zuckonit
        8
    Zuckonit  
       2016-12-21 11:02:31 +08:00
    1. mysql
    2. unique index
    3. ON DUPLICATE KEY UPDATE / INSERT IGNORE
    anthow
        9
    anthow  
       2016-12-21 11:48:47 +08:00
    merge into ... when not matched then insert...
    ihuotui
        10
    ihuotui  
       2016-12-21 12:03:52 +08:00
    捕获唯一索引的错误,然后变为更新操作啊。
    rekulas
        11
    rekulas  
       2016-12-21 23:01:56 +08:00
    insert into table1(a,b,c) select v1,v2,v3 from dual where not exists (select * from table1 where a='a')
    这样也可以无重复插入
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