How to get inserted row ID with WebMatrix

问题

There is a GetLastInsertId method in WebMatrix. However, using Reflector, I can see that it's implemented like this:

[return: Dynamic]
public object GetLastInsertId()
{
    return this.QueryValue("SELECT @@Identity", new object[0]);
}

Which, as far as I can see, is a very bad way of doing it, because @@Identity returns the last insert considering every table and every session. I need this restricted to the scope and session I'm working with, so I was expecting this to use SELECT SCOPE_IDENTITY(), since that also seems to be what is most often used according to my reading.

My questions are:

Do the WebMatrix wrappers do something that makes this ok to use in my case?
If not, is there a simple way to get the inserted ID of an insert query using WebMatrix classes, or should I fall back on stuff like SqlClient for this?

I am interested in answers for SQL Server (not compact) if that makes a difference.

回答1:

To quote David Fowler, one of the devs on the Data APIs in WebMatrix: "[SCOPE_IDENITTY] doesn't work on ce". Since we wanted a data API that would work on both CE and regular SQL Server, we used @@Identity. So if you want to use SCOPE_IDENTITY specifically, you should use db.QueryValue method:

var db = Database.Open(...);
db.Insert(...);
var lastInsertId = db.QueryValue("SELECT SCOPE_IDENTITY()")

回答2:

I had the same problem, and I read these answers but still couldn't get the code to work correctly. I possibly was misreading the solutions above, but what seemed to work for me was as follows:

  var db=Database.Open(...);
  var lastInsertID = db.QueryValue("INSERT name into Names; SELECT SCOPE_IDENTITY()");

回答3:

here is my solution

var db.Database.open('..');
var lastId = db.GetLastInsertId();

来源：https://stackoverflow.com/questions/7753037/how-to-get-inserted-row-id-with-webmatrix

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ASP.NET

sql

sql-server

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webmatrix