Question

我有一个名为member的字典组成的列表，我正在这样的数据库中插入

    # Executes query for each dictionary in member.
    cursor.executemany("INSERT INTO `Citizens` (`Handle`,`Org`,`Role`, "
                       "`Rank`,`Visibility`,`Stars`,`Type`) VALUES "
                       "(%(handle)s,%(sid)s,%(roles)s,%(rank)s,"
                       "%(visibility)s,%(stars)s,%(type)s)", member)
    # Commits changes to the database.
    conn.commit()

它工作得很好，但是当我开始遇到重复成员的问题时，我决定添加一个ON DUPLICATE子句。我们的想法是，如果成员是重复的，我们希望通过连接新数据来更新他的Org列。所以我将代码更改为

    # Executes query for each dictionary in member.
    cursor.executemany("INSERT INTO `Citizens` (`Handle`,`Org`,`Role`, "
                       "`Rank`,`Visibility`,`Stars`,`Type`) VALUES "
                       "(%(handle)s,%(sid)s,%(roles)s,%(rank)s,"
                       "%(visibility)s,%(stars)s,%(type)s) ON DUPLICATE"
                       " KEY UPDATE `Org`=concat(ifnull(`Org`, \"\"), "
                       "\", \", %(sid)s);", member)
    # Commits changes to the database.
    conn.commit()

但是这样做会出现以下错误：

There was a problem inserting member(s): (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '('real_lethality','000',0,'Master','visible',5,'affiliate') ON DUPLICATE KEY UPD' at line 3")
Would you like to see the failed SQL query?[Y/n]
b'INSERT INTO `Citizens` (`Handle`,`Org`,`Role`, `Rank`,`Visibility`,`Stars`,`Type`) VALUES \n(\'fullmetaljim\',\'000\',\'Founder\',\'Master\',\'visible\',5,\'main\') ON DUPLICATE KEY UPDATE `Org`=concat(ifnull(`Org`, ""), ", ", \'000\'),\n(\'real_lethality\',\'000\',0,\'Master\',\'visible\',5,\'affiliate\') ON DUPLICATE KEY UPDATE `Org`=concat(ifnull(`Org`, ""), ", ", \'000\')\n;'

我是否错误地实施了ON DUPLICATE？我怎样才能正常工作？

示例member：

[
    {'roles': [],
     'rank': 'No SCB account',
     'type': 'main',
     'stars': 2,
     'visibility': 'visible',
     'sid': 'imperium',
     'handle': 'freakyeagle'
    },
    {'roles': [],
     'rank': 'Fleet Member',
     'type': 'main',
     'stars': 1,
     'visibility': 'visible',
     'sid': 'imperium',
     'handle': 'cadimus'},
    {'roles': [],
     'rank': 'Fleet Member',
     'type': 'main',
     'stars': 1,
     'visibility': 'visible',
     'sid': 'imperium',
     'handle': 'belleal'}
]

编辑：因为看起来这可能是PyMySQL本身的一个错误，任何人都可以确认吗？

Answer 1

查看您的代码并从错误中查询我同意executemany方法构造的查询不正确。我建议你以更加手动的方式构建插件，循环遍历参数，然后在不使用executemany方法的情况下执行它。

使用单引号时，MySQL AFAIK也是完全可以的，所以如果你用双引号括起来，可以使用单引号作为内部字符串限定符 - 这样你就不需要一直逃脱。

Answer 2

我认为语法错误：

ON DUPLICATE KEY UPDATE `Org`=concat(ifnull(`Org`, ""), ", ",

您需要两个双引号（或两个单引号）

ON DUPLICATE KEY UPDATE `Org`=concat(ifnull(`Org`, ""), "", "",

请注意，这个问题似乎有两次，因为命令重复（??）

这是您发布的查询：

INSERT INTO `Citizens` (`Handle`,`Org`,`Role`, `Rank`,`Visibility`,`Stars`,`Type`)
VALUES \n(\'fullmetaljim\',\'000\',\'Founder\',\'Master\',\'visible\',5,\'main\')
ON DUPLICATE KEY UPDATE `Org`=concat(ifnull(`Org`, ""), ", ", \'000\'),\n(\'real_lethality\',\'000\',0,\'Master\',\'visible\',5,\'affiliate\')
ON DUPLICATE KEY UPDATE `Org`=concat(ifnull(`Org`, ""), ", ", \'000\')\n;

Answer 3

我不知道问题是否已经解决，但我最近不得不运行查询

    **INSERT INTO .... ON DUPLICATE KEY UPDATE**

    // Assuming conn as a connection to a MySQL database and member a dict with the required variables
    cursor = conn.cursor()

    query = (member['handle'], member['org'], member['role'], member['rank'], 
              member['visibility'], member['stars'], member['type']) // Tuple object of the required values from the dict

    cursor.execute("""
                      INSERT INTO Citizens 
                      (Handle,Org,Role,Rank,Visibility,Stars,Type)
                      VALUES(%s,%s,%s,%s,%s,%s,%s)
                      Handle = VALUES(Handle)
                      Org= VALUES(Org)
                      Role= VALUES(Role)
                      Rank= VALUES(Rank)
                      Visibility= VALUES(Visibility)
                      Stars= VALUES(Stars)
                      Type= VALUES(Type)
                   """, query)
    conn.commit()

PyMySQL executemany with ON DUPLICATE

3 个答案: