[英]Does Entity Framework's DbContext save changes if no changes were made?
I could not find an answer on the Internet. 我在互联网上找不到答案。
Let's suppose I have a DbContext
, and I just select all the entities from it. 假设我有一个DbContext
,我只是从中选择所有实体。 I don't add, update or delete any entity on the DbSet
. 我不添加,更新或删除DbSet
上的任何实体。
If I call SaveChanges
afterwards on the DbSet
. 如果我之后在DbSet
上调用SaveChanges
。 Does it actually waste resources establishing a connection and other stuff even If I did not made any changes to the DbSet
? 它是否真的浪费资源建立连接和其他东西即使我没有对DbSet
做任何更改?
Is it smart enough to detect if a change was made or not, and behave differently? 是否足够智能来检测是否进行了更改,并且行为方式不同?
It uses EntityState to determine that there is nothing to commit and so does not waste resources. 它使用EntityState来确定没有任何提交,因此不会浪费资源。
http://msdn.microsoft.com/en-us/library/system.data.entitystate%28v=vs.110%29.aspx http://msdn.microsoft.com/en-us/library/system.data.entitystate%28v=vs.110%29.aspx
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