EF查询生成的SQL

using (var context = new TestDBEntities()) 2 { 3 var query = from p in context.Parents 4 where p.Name == "zhaokun" 5 select p; 6 7 ObjectQuery<Parent> parents = query as ObjectQuery<Parent>; 8 if (parents != null) 9 { 10 string sql = parents.ToTraceString(); 11 } 12 } totracestring

这里所生成的SQL为：

1 [Extent1].[ParentID] AS [ParentID], 
2 [Extent1].[Name] AS [Name]
3 FROM [dbo].[Parent] AS [Extent1]
4 WHERE N‘zhaokun‘=[Extent1].[Name]

sqlone

在EF 4.1中，我们可以直接调用DbQuery<>的ToString()方法得到所生成的SQL。

1 using (var context = new MyDbContext())
2 {
3     var people = from p in context.People
4                  where p.PersonID > 100
5                  select p;
6 
7     string sql = people.ToString();
8 }

tostring

所生成的SQL是：

1 SELECT 
2 [Extent1].[PersonID] AS [PersonID], 
3 [Extent1].[Name] AS [Name]
4 FROM [dbo].[People] AS [Extent1]
5 WHERE [Extent1].[PersonID] > 100

sqltwo

这里的ToString()方法其实也就是调用了ObjectQuery<>的ToTraceString()方法。 DbQuery<>.ToString() ==>  System.Data.Entity.Internal.Linq.InternalQuery<>.ToString()方法，此方法 在.NET Reflector得到的实现是这样的：

1 public override string ToString()
2 {
3     return this._objectQuery.ToTraceString();
4 }

tostring（）

看书得到！

EF查询生成的SQL

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