1、打开一个postgreSQL的SQL Shell或pgAdmin的SQL编辑器窗口,执行: begin; select * from db_user where name='lisi'; 输出结果: 2、再打开一个postgreSQL的SQL Shell或pgAdmin的SQL编辑器窗口,执行: begin; select * from db_user where name='lisi'; 输出结
我们还可以通过select * from a for update of a.a;(a表的a列)对记录中的某一列进行锁定。 当我们使用FOR UPDATE子句将记录锁定后,其他进程在对锁定记录进行update或delete操作时,就会处于停顿状态,等待解锁。当锁定进程释放锁定以后才会继 续执行。如果不想其他进行进入停顿状态,可以用nowait子句,直接返回操作异...
窗口1 SELECT*FROMnumber_of_formWHEREyear='24'ANDmonth='02'FORUPDATE;UPDATEnumber_of_formSETnumber=3WHEREuuid={{your_uuid}}; 另外需要注意的是,我再DataGrip中,将提交设置为了手动。这样才能在执行的时候,触发另一个语句。 此时,数据如下所示 同步进行 窗口2 UPDATEnumber_of_formSETnumber=(SELECTnumber...
The locking clause has the general form FOR lock_strength [ OF table_name [, ...] ] [ NOWAIT | SKIP LOCKED ] where lock_strength can be one of UPDATE -- 当前事务可以改所有字段 NO KEY UPDATE -- 当前事务可以改除referenced KEY以外的字段 SHARE -- 其他事务不能改所有字段 KEY SHARE --...
1. SELECT * from users where user_id='60' FOR UPDATE; 因为上面事务还没有提交,id =60的数据已经被锁住,此处再执行的话数据库会报错! [Err] 1205 - Lock wait timeout exceeded; try restarting transaction 2.在另外一个窗口中来对表进行更新操作一样不能成功,会返回同样的错误。
【Oracle笔记】select for update的用法及实例解析 一、它有什么作用 select for update 是为了在查询时,避免其他用户以该表进行插入,修改或删除等操作,造成表的不一致性。 二、举几个例子: select * from t for update 会等待行锁释放之后,返回查询结果。 select * from t for update nowait 不等待行锁释放...
String sql= "";if(dbType.contains("postgresql")) { Statement statement=session.connection().createStatement(); statement.setQueryTimeout(5); sql= "SELECT * FROM EMS_SYSTEM_DEVICE WHERE NAME='CMS' FOR UPDATE"; statement.execute(sql); ...
PostgreSQL version 17.5 is now available on Amazon RDS. This release contains several fixes and improvements for PostgreSQL announced in the PostgreSQL 17.5 release. General enhancements Fixed for the address_standardizer_data_us extension issue regarding ALTER EXTENSION UPDATE failure. Changed the Oracle...
There are two types of upgrades that you can manage for your PostgreSQL database: Operating system updates – Occasionally, Amazon RDS might need to update the underlying operating system of your database to apply security fixes or OS changes. You can decide when Amazon RDS applies OS updates ...
percona/percona-postgresql-operator:2.6.0-ppg17.4-pgbackrest2.54.2, percona/pmm-client:2.44.0. before The deployment rollout will be automatically triggered by the applied patch. The update process is successfully finished when all Pods have been restarted. ...