java – 不可重复读取与脏读取之间的差异

发布时间：2020-12-15 00:00:34 所属栏目：Java 来源：网络整理

导读：从 this oracle java教程： A non-repeatable read occurs when transaction A retrieves a row, transaction B subsequently updates the row,and transaction A later retrieves the same row again. Transaction A retrieves the same row twice but sees

从 this oracle java教程：

A non-repeatable read occurs when transaction A retrieves a row,
transaction B subsequently updates the row,and transaction A later
retrieves the same row again. Transaction A retrieves the same row
twice but sees different data.

脏阅读与不可重复阅读有什么区别？这不一样吗？阅读错误的结果由于别人的更新？

提前致谢.

解决方法

完全相同的页面解释了什么是脏读：

Accessing an updated value that has not been committed is considered a dirty read because it is possible for that value to be rolled back to its previous value. If you read a value that is later rolled back,you will have read an invalid value.

因此,不可重复的读取在于读取两个不同的承诺值,而脏读取在于读取尚未提交的值.很不一样.

（编辑：李大同）

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