在MySQL中的一个查询中更新多个具有不同值的行

我试图了解如何更新具有不同值的多行，我只是没有得到它。解决方案无处不在，但对我来说，它看起来很难理解。

例如，对一个查询进行三次更新:

UPDATE table_users
SET cod_user = '622057'
    , date = '12082014'
WHERE user_rol = 'student'
    AND cod_office = '17389551'; 

UPDATE table_users
SET cod_user = '2913659'
    , date = '12082014'
WHERE user_rol = 'assistant'
    AND cod_office = '17389551'; 

UPDATE table_users
SET cod_user = '6160230'
    , date = '12082014'
WHERE user_rol = 'admin'
    AND cod_office = '17389551';

我读了一个例子，但我真的不明白如何进行查询。即:

UPDATE table_to_update
SET cod_user= IF(cod_office = '17389551','622057','2913659','6160230')
    ,date = IF(cod_office = '17389551','12082014')
WHERE ?? IN (??) ;

我不完全清楚如何做查询，如果有多个条件在哪里和在if条件..有什么想法?

当前回答

UPDATE table_name
SET cod_user = 
    CASE 
    WHEN user_rol = 'student' THEN '622057'
    WHEN user_rol = 'assistant' THEN '2913659'
    WHEN user_rol = 'admin' THEN '6160230'
    END, date = '12082014'

WHERE user_rol IN ('student','assistant','admin')
AND cod_office = '17389551';

2016-12-11 07:43:56

其他回答

你可以使用CASE语句来处理多个if/then场景:

UPDATE table_to_update 
SET  cod_user= CASE WHEN user_rol = 'student' THEN '622057'
                   WHEN user_rol = 'assistant' THEN '2913659'
                   WHEN user_rol = 'admin' THEN '6160230'
               END
    ,date = '12082014'
WHERE user_rol IN ('student','assistant','admin')
  AND cod_office = '17389551';

2014-09-04 20:54:58

UPDATE Table1 SET col1= col2 FROM (SELECT col2, col3 FROM Table2) as newTbl WHERE col4= col3

这里col4和col1在表1中。col2和col3在表2中，我试图更新每个col1，其中col4 = col3为每行不同的值

2020-04-23 04:25:51

你可以这样做:

UPDATE table_users
    SET cod_user = (case when user_role = 'student' then '622057'
                         when user_role = 'assistant' then '2913659'
                         when user_role = 'admin' then '6160230'
                    end),
        date = '12082014'
    WHERE user_role in ('student', 'assistant', 'admin') AND
          cod_office = '17389551';

我不懂你的日期格式。日期应该使用本地日期和时间类型存储在数据库中。

2014-09-04 20:53:56

我是这样做的:

<update id="updateSettings" parameterType="PushSettings">
    <foreach collection="settings" item="setting">
        UPDATE push_setting SET status = #{setting.status}
        WHERE type = #{setting.type} AND user_id = #{userId};
    </foreach>
</update>

其中PushSettings是

public class PushSettings {

    private List<PushSetting> settings;
    private String userId;
}

它运行正常

2020-04-16 13:30:22

UPDATE table_name
SET cod_user = 
    CASE 
    WHEN user_rol = 'student' THEN '622057'
    WHEN user_rol = 'assistant' THEN '2913659'
    WHEN user_rol = 'admin' THEN '6160230'
    END, date = '12082014'

WHERE user_rol IN ('student','assistant','admin')
AND cod_office = '17389551';

2016-12-11 07:43:56

在MySQL中的一个查询中更新多个具有不同值的行

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