Question

I have gone through an article of using EntityConnection, EntityCommands for executing Entity sql queries. But I was unable to understand that Why are we using Entity sql? Why not directly using the Classes and objects for processing CRUD operations on database?

Or If we want to execute sql queries then why we are using Entity Sql , why not directly Ado.net ?

Is there any performance difference or something else?
I have already gone through the page http://msdn.microsoft.com/en-us/library/bb738573.aspx. But I want answer in a more simpler way. Can you please answer me?

Thanks

Answer 1

Why not directly using the Classes and objects for processing CRUD operations on database?

That is (should be) the way for almost all operations. But sometimes there is a need for accessing the db more directly and precisely.

If we want to execute sql queries then why we are using Entity Sql , why not directly Ado.net ?

E-SQL will still let you work with entities (instead of Rows). This is much easier and more powerful, consider inheritance for example.

E-SQL is also supposed to be independent of the actual database, ie the same for Oracle etc. I have no experience with this yet.

Is there any performance difference or something else?

It can be used to improve performance, yes. But not automatically.