可以创建一个存储过程,在存储过程中执行多条UPDATE语句。 sql DELIMITER // CREATE PROCEDURE UpdateMultipleRows() BEGIN UPDATE table_name SET column1 = value1 WHERE condition1; UPDATE table_name SET column2 = value2 WHERE condition2; -- 可以添加更多的UPDATE语句 END // DELIMITER ; -- 调用存储过...
My problem is that I might find that most of the records need updating, and this might lead to 100,00+ update statements I cannot use LOAD DATA as this is product database Is there a way to update multiple rows (each with a different value and condition in a single query? regards...
参考:http://www.ghugo.com/update-multiple-rows-with-different-values-and-a-single-sql-query/分类: 知识点 好文要顶 关注我 收藏该文 微信分享 Old 粉丝- 54 关注- 19 +加关注 2 0 升级成为会员 « 上一篇: datagridview设置currentrow为指定的某一行[转] » 下一篇: Linux和UNIX监控 ...
注意:执行的sql语句长度受到my.ini配置文件中max_allowed_packet参数的限制,所以当您使用本文的方法批量更新多条数据,超出sql语句长度限制时,请适当的修改该参数 本文参考自:http://www.ghugo.com/update-multiple-rows-with-different-values-and-a-single-sql-query/...
这样我们能轻松的在connection.query的回调函数中写执行完所有更新后的操作了,这种方式本质上是当有重复数据的时候先删除了原先记录并保留未更新字段,再进行插入,所以以上代码虽然只更新了3条语句,而affectedrows却有6行: 3,拼接update语句 mysql可以同时执行多条sql语句,如果我们将要执行的所有update语句拼成一条执行,...
To update multiple columns in a singleUPDATEstatement, we can use the following syntax: UPDATEusersSETname='Dave',age=45WHEREid=3; 1. 2. 3. This statement will update both thenameandagecolumns of the row withidequal to 3. Example 3: Updating All Rows ...
mysql> begin;Query OK, 0 rows affected (0.01 sec)mysql> update test_record_lock set name = 'aaa' where id >= 1;Query OK, 3 rows affected (0.00 sec)Rows matched: 3 Changed: 3 Warnings: 0mysql> select LOCK_TYPE,INDEX_NAME,LOCK_MODE,LOCK_DATA from performance_schema.data_locks;+--...
In this tutorial, you will learn how to use MySQL UPDATE statement to update data in database tables. Introduction to MySQL UPDATE statement The UPDATE statement is used to update existing data in tables. It can be used to change column values of a single row, a group of rows or all ...
updatet2setname='d'whereid=1trx_operation_state:startingindexreadtrx_tables_in_use:1trx_tables_locked:1# 1个表上有行锁trx_lock_structs:2# 内存中2个锁结构trx_lock_memory_bytes:1136trx_rows_locked:1# 1行数据被锁定trx_rows_modified:0trx_concurrency_tickets:0trx_isolation_level:REPEATABLEREAD...
Subject Views Written By Posted Updating multiple rows 6723 Jordi Tarruella June 11, 2007 06:08AM Sorry, you can't reply to this topic. It has been closed.Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and ...