@@IDENTITY after INSERT statement always returns 0

Question

I need a function which executes an INSERT statement on a database and returns the Auto_Increment primary key. I have the following C# code but, while the INSERT statement w

Answer 1

As you're using Access, take a look at this article from aspfaq, scroll down to about half way down the page. The code's in classic ASP, but hopefully the principles should still stand.

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The SELECT @@Identity ends up being treated as a separate execution context, I believe. Code that should work would be:

public int ExecuteInsertStatement(string statement)
{
    InitializeAndOpenConnection();

    IDbCommand cmdInsert = connection.CreateCommand();
    cmdInsert.CommandText = statement + "; SELECT @@Identity";
    object result = cmdInsert.ExecuteScalar();

    if (object == DBNull.Value)
    {
       return -1;
    }
    else
    {
       return Convert.ToInt32(result);
    }
}

You'd probably want/need to tidy up the concatenation that adds the 'SELECT @@Identity' onto the end of the code though.