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  • ON DUPLICATE KEY UPDATE mysql 添加或更新

    目的:当表中unique索引或者primary key(主键)出现重复时,执行update操作,当不出现重复时,执行insert操作

    例子:

    INSERT INTO tp_circle_recommend 
    (userid, circleids, nohad, bothhad, had)
    VALUES( {a}, '{b}', '{c}', '{d}', '{e}') 
    ON DUPLICATE KEY UPDATE 
    circleids = VALUES(circleids),
    nohad = VALUES(nohad),
    bothhad = VALUES(bothhad),
    had = VALUES(had); 

    sql语句, 使用sqlalchemy orm excute 执行sql 语句 插入数据

    def insert_update_df(df: pd.DataFrame, conn):
        sql_template = '''
            INSERT INTO tp_circle_recommend 
            (userid, circleids)
            VALUES( {a}, '{b}') 
            ON DUPLICATE KEY UPDATE 
            circleids = VALUES(circleids)
        '''
        for i in df.iterrows():
            sub = i[1]
            this_sql = sql_template.format(a=sub["userid"], b=sub["circleids"])
            conn.execute(this_sql)

    或者先清空表,再删除表

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  • 原文地址:https://www.cnblogs.com/wt7018/p/12850433.html
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