【如何在没有UNIQUE索引或PRIMARY KEY的MySQL中使用ON DUPLICATE KEY UPDATE?】教程文章相关的互联网学习教程文章

my -> mysql on duplicate key update使用总结

CREATE TABLE `t_duplicate` ( `a` int(11) NOT NULL, `b` int(255) DEFAULT NULL, `c` int(255) DEFAULT NULL, PRIMARY KEY (`a`) USING BTREE) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT=‘测试验证on duplicate key update 功能‘; SELECT * FROM `t_duplicate`; #添加和更新结果不一样,#添加数据时,也就是当表中不存在唯一主键为a这条数据时,忽略on后面的内容,(此时是添加一条数据,不是update一条数据)#当表中存...

mysql ON DUPLICATE KEY UPDATE重复插入时更新【代码】

mysql当插入重复时更新的方法: 第一种方法: 示例一:插入多条记录 假设有一个主键为 client_id 的 clients 表,可以使用下面的语句:INSERT INTO clients (client_id,client_name,client_type) SELECT supplier_id,supplier_name,‘advertising‘ FROM suppliers WHERE not exists(select * from clients where clients.client_id=suppliers.supplier_id);示例一:插入单条记录INSERT INTO clients (client_id,client_name,cli...

mysql Duplicate entry '9223372036854775807' for key 'PRIMARY'【图】

mysql插入#27;数据报错提示: ERROR 1062(23000) Duplicate entry ‘9223372036854775807‘ for key ‘PRIMARY‘ 发现问题果断 直接 把字段改成无符号的类型UNSIGNED 7.BIGINT[(M)] [UNSIGNED] [ZEROFILL] M默认为20 大整数。带符号的范围是-9223372036854775808到9223372036854775807。无符号的范围是0到18446744073709551615。 提示:这是生产环境遇到的问题,所以记下来了。mysql Duplicate entry 9223372036854775807 ...

mysql中的ON DUPLICATE KEY UPDATE【图】

没错,答案就是用ON DUPLICATE KEY UPDATE。看图说话: 要想两者合体,就需要显示插入主键。如果插入的主键不存在或者主键是自增的时候参数中没有赋主键值(这时主键时null),这时会执行新增数据操作;如果主键在表中已经存在,就会执行ON DUPLICATE KEY UPDATE语句进行数据更新。 mybatis中这样写: ON DUPLICATE KEY UPDATE后面的语句解读: 1、我们需要更新的字段写在这里; 2、“=” 左边是声明要更新那个字段(字段名与数...

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'qingmu' for key 'PRIMARY'

key ‘PRIMARY‘ ### The error may involve com.qingmu2.core.dao.seller.SellerDao.insertSelective-Inline ### The error occurred while setting parameters ### SQL: insert into tb_seller ( seller_id, name, nick_name, password, telephone, status, address_...

on duplicate key mysql插入更新【代码】

insert into `test` (`job_id`, `user_name`, `total_time`) values (‘12345‘, ‘zhangsan‘, ‘10‘) on duplicate key update `job_id` =‘12345‘,`user_name` = ‘zhangsan‘, `total_time`= ‘14‘;会判断主键或唯一键,存在就更新,不存在就插入on duplicate key mysql插入更新标签:sql san test duplicate 判断 date value 更新 into 本文系统来源:https://www.cnblogs.com/zhangxiaoj/p/11294409.ht...

MySQL-插入更新 ON DUPLICATE KEY UPDATE【代码】【图】

TABLE `flume_meta` (`source_tab` varchar(255) COLLATE utf8_bin DEFAULT NULL UNIQUE,`current_index` bigint(255) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin; 执行更新插入INSERT INTO `flume_meta` VALUES(‘user‘,1) ON DUPLICATE KEY UPDATE source_tab=‘user‘,current_index=5;第一次执行后再次执行 变成了更新操作MySQL-插入更新 ON DUPLICATE KEY UPDATE标签:into alt big varchar...

LeetCode——Delete Duplicate Emails(巧用mysql临时表)【代码】

Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id.+----+------------------+ | Id | Email | +----+------------------+ | 1 | john@example.com | | 2 | bob@example.com | | 3 | john@example.com | +----+------------------+ Id is the primary key column for this table. For example, after running your query, t...

遇到的错误:Mysql 报错Duplicate entry '值' for key '字段名'的解决

admin‘ for key ‘user_name_unique‘ ### The error may involve com.mmall.dao.UserMapper.insert-Inline ### The error occurred while setting parameters ### SQL: insert into mmall_user (id, username, password, email, phone, question, answer, role, create_time, update_time) values (?, ?, ?, ?, ?, ?, ?, ?, now(), now()) ### Cause: com.mysql.jdbc.exceptions.j...

关于使用MySQL语法ON DUPLICATE KEY UPDATE单个增加更新及批量增加更新的sql【代码】

INTO table (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE table SET c=c+1 WHERE a=1;ON DUPLICATE KEY UPDATE后面可以放多个字段,用英文逗号分割。 再现一个例子:INSERT INTO table (a,b,c) VALUES (1,2,3),(4,5,6) ON DUPLICATE KEY UPDATE c=VALUES(a)+VALUES(b); 表中将更改(增加或修改)两条记录。 在mybatis中进行单个增加或修改sql的写法为:<insert id="insertOrUpdateCameraInfoByOne" paramerT...

MySQL INSERT ON DUPLICATE KEY UPDATE【代码】【图】

来源:https://www.mysqltutorial.org/mysql-insert-or-update-on-duplicate-key-update/ Introduction to the MySQL INSERT ON DUPLICATE KEY UPDATE statement The INSERT ON DUPLICATE KEY UPDATE is a MySQL’s extension to the SQL standard’s INSERT statement. When you insert a new row into a table if the row causes a duplicate in UNIQUE index or PRIMARY KEY , MySQL will issue an error. However, if you speci...

mysql ON DUPLICATE KEY UPDATE 演示【代码】

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...

mysql IntegrityError: (pymysql.err.IntegrityError) (1062, &quot;Duplicate entry &#39;000001.SZ-2018-07-02&#39; for key &#39;PRIMARY&#39;&quot;)

and originates from the database driver (DBAPI), not SQLAlchemy itself. mysql IntegrityError: (pymysql.err.IntegrityError) (1062, "Duplicate entry 000001.SZ-2018-07-02 for key PRIMARY")标签:ram ocs 添加记录 free his reference try share nat 本文系统来源:https://www.cnblogs.com/ttrrpp/p/12610654.html

ERROR 1130: Host &#39;192.168.1.3&#39; is not allowed to connect to this MySQL ERROR 1062 (23000): Duplicate entry &#39;%-root&#39; for key &#39;PRIMARY&#39;【代码】

use mysqlmysql> select host, user from user;将相应用户数据表中的host字段改成‘%‘; update user set host=‘%‘ where user=‘root‘;ERROR 1062 (23000): Duplicate entry ‘%-root‘ for key ‘PRIMARY‘ 不予理会 flush privileges;重新远程连接OKERROR 1130: Host 192.168.1.3 is not allowed to connect to this MySQL ERROR 1062 (23000): Duplicate entry %-root for key PRIMARY标签:error key entry nec ...

(主键策略)ON DUPLICATE KEY UPDATE(Mysql的使用)【图】

on duplicate key update 如果在insert语句后面带上ON DUPLICATE KEY UPDATE 子句,而要插入的行与表中现有记录的惟一索引或主键中产生重复值,那么就会发生旧行的更新;如果插入的行数据与现有表中记录的唯一索引或者主键不重复,则执行新纪录插入操作。另外,ON DUPLICATE KEY UPDATE不能写where条件。 需要注意的是:如果行作为新记录被插入,则受影响行的值为1;如果原有的记录被更新,则受影响行的值为2,如果更新的数据和...