实体框架：Database.ExecuteSqlCommand方法

Question

So, I have a basic update statement I am running in my MVC 4 app. I am calling it like so (SQL Server 2008 R2, Entity Framework 5.0):

var requestData = requestInfo.Database.ExecuteSqlCommand("UPDATE TABLE Blah.. ");

The command completes successfully, but sometimes requestData returns 1, sometimes it returns 2. I cannot find any documentation or explanation of what these return values mean. I have looked here:

http://msdn.microsoft.com/en-us/library/gg679456(v=vs.103).aspx

But, it does not give any clear answer.

If someone can toss out a link to something that explains the return values of this command I would be greatly appreciative.

Answer 1

The command completes successfully, but sometimes requestData returns 1, sometimes it returns 2. I cannot find any documentation or explanation of what these return values mean.

ExecuteSqlCommand will return the number of rows affected by your UPDATE statement.

---

Testing :

//Update ID 2
using (var context = new Test2Context())
{
    var items = context.MyTestClasses.Where(x => x.Id == 2).Count();
    var rowsAffected = context.Database.ExecuteSqlCommand("UPDATE MyTestClasses SET Name = 'Test2' WHERE Id = 2");
    Debug.WriteLine("--First Test--");
    Debug.WriteLine("items: {0}", items);
    Debug.WriteLine("rowsAffected: {0}", rowsAffected);
}

//Update all
using (var context = new Test2Context())
{
    var items = context.MyTestClasses.Count();
    var rowsAffected = context.Database.ExecuteSqlCommand("UPDATE MyTestClasses SET Name = 'Updated'");
    Debug.WriteLine("--Second Test--");
    Debug.WriteLine("items: {0}", items);
    Debug.WriteLine("rowsAffected: {0}", rowsAffected);
}

Results :

--First Test--
items: 1
rowsAffected: 1
--Second Test--
items: 3
rowsAffected: 3