如何从C＃代码的存储过程中获取@@ identity或SELECT SCOPE_IDENTITY（）的值？

Question

I use SQL Server 2012. In this stored procedure, I want to get the value of @@identity or SELECT SCOPE_IDENTITY() . intMyIdentity is the identity column.

CREATE PROCEDURE [spMyInsert] 
    (@vchVar AS VARCHAR(20), 
     @fltVar AS FLOAT)
AS
    SELECT TOP 1 intMyIdentity 
    FROM MyTbl  
    WHERE vchVar = @vchVar

    IF @@rowcount = 0
    BEGIN
        INSERT INTO MyTbl (vchVar, fltVar) 
        VALUES (@vchVar, @fltVar)

        SELECT @@identity AS intMyIdentity 
        -- SELECT SCOPE_IDENTITY()
    END

How can I get the value of @@identity or SELECT SCOPE_IDENTITY() in C# ?

When using ExecuteScalar , it returns 0, instead of the correct value.

SqlConnection oConn = new SqlConnection(ConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString);
oConn.Open();

mCommand.CommandText = "spMyInsert";
mCommand.Parameters.Add(new SqlParameter("@vchVar", txtMyVar.Text));
mCommand.Parameters.Add(new SqlParameter("@fltVar", dblMyVar));
mCommand.Connection = oConn;
mCommand.CommandType = CommandType.StoredProcedure; 

intMyIdentity = Convert.ToInt32(mCommand.ExecuteScalar());  --> this always return 0
oConn.Close();

Edited: this query works

IF NOT EXISTS (SELECT 1 FROM myTbl WHERE vchVar = @vchVar)
BEGIN
    INSERT INTO myTbl (vchVar, fltVar)
    VALUES (@vchVar, @fltVar)

    SELECT SCOPE_IDENTITY()
END

Answer 1

When you use ExecuteScalar, your stored procedure must RETURN the @@identity. Something like RETURN @@IDENTITY;