我只在数据库选项已开启“行版本控制的已提交读”(READ_COMMITTED_SNAPSHOT为ON)中进行了观察。
因此只适用于这种环境的数据库。
该类数据库支持四种不同事务隔离级别，下面分别观察数据库的锁行为，测试代码未涉及锁升级。
请先参阅：
数据库引擎中的锁定
https://msdn.microsoft.com/zh-cn/library/ms190615.aspx
一、环境：数据库开启“行版本控制的已提交读”，要求单一连接(非单用户模式)
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