10 2015 档案
摘要:悲观锁悲观锁是指假设并发更新冲突会发生,所以不管冲突是否真的发生,都会使用锁机制。悲观锁会完成以下功能:锁住读取的记录,防止其它事务读取和更新这些记录。其它事务会一直阻塞,直到这个事务结束。悲观锁是在使用了数据库的事务隔离功能的基础上,独享占用的资源,以此保证读取数据一致性,避免修改丢失。悲观锁可以...
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摘要:Cyclomatic Code Complexity was first introduced by Thomas McCabe in 1976. In 1976, Thomas McCabe published a paper arguing that code complexity is d...
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摘要:I've met this problem for so many times and let me write a blog for solving this problem.First, you have a repository called repo1 for example, and wa...
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