TableAdapter returns null for stored proc returning a single value

[bogdan]

Hi,

I have a stored procedure that returns a single value. Example:
[...]
SELECT @RowCount = COUNT(*) FROM t WHERE [...]
RETURN @RowCount

I created a data set, table adapter, and adapter's method configured for the
stored proc and as returning a single value. The wizard created an adapter
method that calls SqlCommand.ExecuteScalar(). The problem is that
ExecuteScalar() always returns a null object. I have no problem executing
the stored procedure from outside of asp.net.

Could someone please let me give me some idea what could be wrong here?

Thanks,
Bogdan

 

[Waldy]

Have you set the SqlCommand.CommandType to StoredProcedure?

 

[bogdan]

I used TableAdapter Qeury Configuration Wizard and selected "Use existing
stored procedure".

Have you set the SqlCommand.CommandType to StoredProcedure?

Hi,

I have a stored procedure that returns a single value. Example:
[...]
SELECT @RowCount = COUNT(*) FROM t WHERE [...]
RETURN @RowCount

I created a data set, table adapter, and adapter's method configured for
the stored proc and as returning a single value. The wizard created an
adapter method that calls SqlCommand.ExecuteScalar(). The problem is
that ExecuteScalar() always returns a null object. I have no problem
executing the stored procedure from outside of asp.net.

Could someone please let me give me some idea what could be wrong here?

Thanks,
Bogdan

 

[bruce barker]

executescaler returns the first column, of the first row, of the first
resultset. your stored proc does not return any rows, only a return value. to
get the return value, use ExecuteNonQuery with a returnvalue parameter

cmd.CommandText = "myproc";
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter param = new SqlParameter("@returnValue",SqlDbType.Int);
param.Direction = ParameterDirection.ReturnValue;
cmd.Parameters.Add(param);
cmd.ExecuteNonQuery();
int rows = (int) cmd.Parameters("@returnValue").Value;


-- bruce (sqlwork.com)