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Mysql的事务
2022-07-06 09:25:00 【手可摘鑫晨】
1,概念
(3)隔离性:⼀个事务的执⾏不能其它事务⼲扰。⼀个事务内部的操作及使⽤的数据对其它并发事务是隔离的,并发执⾏的各个事务之间不能互相⼲扰。
(4)持久性:也称永久性,指⼀个事务⼀旦提交,它对数据库中的数据的改变就应该是永久性的。接下来的其它操作或故障不应该对其执⾏结果有任何影响。
3,隔离级别
(1)读取未提交内容(Read Uncommitted)
所有事务都可以看到其他未提交事务的执行结果。可以读取未提交数据。(脏读)
(2)读取提交内容(Read Committed)
在事务提交或者回滚之后,才可以被读取到数据。(不可重复读)
(3)可重复读(Repeatable Read)
数据库被添加数据的事务的时候,可以读取到数据。(可重复读)
(4)可串行化(Serializable)
事务执行时,会在所有级别上加锁,仿佛事务是以串行的方式进行的,而不是一起发生的。相互之间不会发生冲突。
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