如何编辑实体框架生成的SQL查询？

Question

I'm working on Visual studio 2012 (C#) and use Entity Framework to handle a queries with SQL server .

For performance reasons I want to be able to edit the background sql query code and customize it . (to make entity framework more manually and to control what it produce in the back) .

I saw all the posts about TraceToString this is not what I mean, I need to be able to edit the background code online and not only show that.

EDIT

if ((activityBox.Text != "") && (biasBox.Text == ""))
{
aggGk = (from sk in db.DIM_COV_TEST_AGGREGATION_KEY 
where activityGk.Contains(sk.COV_ACTIVITY_GK) && (sk.DATE_ID >= beginTime) 
&& (sk.DATE_ID <= endTime) 
select sk.TEST_AGGREGATION_KEY_GK).Distinct().ToList(); 
}

Answer 1

I believe that using if you are not compromised with the performance, you need to follow the TSQL queries. If you are a .NET developer, you will be familiarized with SQL queries.

The below link gives a greater comparision of different options

1. Entity Framework VS LINQ to SQL VS ADO.NET with stored procedures?

Its is also possible to use your Stored procedures with EF. Check these two links

1. http://msdn.microsoft.com/en-us/data/gg699321.aspx
2. http://www.codeproject.com/Articles/522611/Entity-Framework-CRUD-Operations-Using-Stored-Proc

We cannot control the execution of EF queries , but surely we can do optimization of SQL queries for better performance. All things you need is to generate a model/ entity classes to handle the data.

Answer 2

您不能（轻松地）影响框架生成的SQL，您正在寻找的可能是实体SQL （可能与ObjectQuery <T>结合使用），它使您可以在实体框架的顶部编写自己的查询。更灵活的方式。

Answer 3

From the top of my head I would say it is not possible. The entire point of having a OR framework is to avoid getting into the SQL language.

For more fruitful discussion it would be great if you share what kind of optimization you want to be done by editing the generated SQL alongwith the entities involved.

I would like to Add the following link http://msdn.microsoft.com/en-us/library/bb399560.aspx

This is not exactly editing a SQL generated from the Framework, but you could use this where you need some performance tweaking.

Answer 4

For some specified query that you want to customize, you can try DataContext.ExecuteQuery<TResult>(string query, params object[] parameters) . But if you find there's too much you need to customize, it means that it's not a good idea to use Entify Framework in your scenario.