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  • mysql ON DUPLICATE KEY UPDATE 演示

    <e>查询:INSERT INTO member_test(mem_no,flag)VALUE('111','1')

    错误代码: 1062
    Duplicate entry '111' for key 'uk_mem_no'

    1.创建数据库表演示

    CREATE TABLE `member_test` (
      `id` INT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
      `mem_no` INT(11) NOT NULL,
      `flag` INT(2) NOT NULL DEFAULT '0' COMMENT '是否是测试会员,0不是,1是',
      `create_time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
      `update_time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
      `is_delete` TINYINT(1) NOT NULL DEFAULT '0',
      PRIMARY KEY (`id`),
      UNIQUE KEY `uk_mem_no` (`mem_no`)
    ) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COMMENT='会员测试信息';

    2.在遇到主键冲突的时候,跳过不报错。不主键冲突则新增,否则修改(含本条记录不修改)

    #查询
    SELECT * FROM member_test;
    #初始化
    INSERT INTO member_test(mem_no,flag)VALUE('111','1');
    #错误代码: 1062 Duplicate entry '111' for key 'uk_mem_no'
    INSERT INTO member_test(mem_no,flag)VALUE('111','1');
    
    
    ##有主键冲突修改  影响行数2
    INSERT INTO member_test(mem_no,flag)VALUE('111','1')
    ON DUPLICATE KEY UPDATE flag = flag - 1;
    
    ##无主键冲突新增  影响行数1
    INSERT INTO member_test(mem_no,flag)VALUE('222','1')
    ON DUPLICATE KEY UPDATE flag = flag;
    
    ##有主键冲突无修改 影响行数0
    INSERT INTO member_test(mem_no,flag)VALUE('222','1')
    ON DUPLICATE KEY UPDATE flag = flag;
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  • 原文地址:https://www.cnblogs.com/oktokeep/p/13252208.html
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