PRB: Errors Not Returned When Stored Procedure Statement Fails

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This article was previously published under Q253240

SYMPTOMS

When executing a stored procedure with multiple queries (SELECTs, INSERTs and UPDATEs), the ActiveX Data Objects (ADO) errors collection appears not to be populated after an error occurs in the stored procedure. The stored procedure might also not return values from its RETURN statement.

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CAUSE

The SQL Server OLE DB provider provides more accurate information (than ODBC) to the caller about what happened in the procedure. Each SQL statement within a stored procedure returns a "result," either a count of rows affected or a result set. You can walk through these result sets in ADO using the NextRecordset method on the Recordset object.

The SQL Server ODBC provider, however, does not provide information about the results of individual SQL statements within a stored procedure. The only result that comes back from a stored procedure execution is the result of the SELECT statement, if it has one. This is why this problem may not manifest with ODBC.

In both cases, return values from the stored procedure may not be returned.

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RESOLUTION

To resolve this problem, make sure that the SET NOCOUNT ON statement comes before any other SQL statements in the stored procedure, as in the following:

CREATE PROCEDURE TestProc
AS 
  SET NOCOUNT ON -- This is off by default
  SELECT au_lname FROM Authors
  RETURN 0

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STATUS

This behavior is by design.

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MORE INFORMATION

Steps to Reproduce the Behavior

Create an ASP page with the following code:

Note You must change UserID=<username> to the correct value before you run this code. Make sure that the User ID has the appropriate permissions to perform this operation on the database.

<%

Set oConn = Server.CreateObject("ADODB.Connection")
Set Rs = Server.CreateObject("ADODB.Recordset")

On Error Resume Next

oConn.Open("Provider=SQLOLEDB.1;User ID=<username>;Initial Catalog=Northwind;Data Source=DataSourceName")

Set oCmd = Server.CreateObject("ADODB.Command")

Set oCmd.ActiveConnection = oConn

oCmd.CommandText = "TestProc"
oCmd.CommandType = adCmdStoredProc
oCmd.Parameters.Append oCmd.CreateParameter("RETURN_VALUE",3,4,0)

oCmd.Execute()

If oCmd.ActiveConnection.Errors.Count > 0 Then
  For Each oError in oCmd.ActiveConnection.Errors 
    Response.Write "Description = " & oError.Description & "<BR>"
  Next
End If

Response.Write( "Return Value = "  & oCmd.Parameters("RETURN_VALUE") & "<BR>")
oConn.Close

Set oConn = Nothing
Set oCmd = Nothing

%>

Create a stored procedure similar to the following:

ALTER Procedure TestProc AS
-- Uncommenting the line below resolved this problem
-- set nocount ON
begin tran
  insert into xxx values(1)
   
  If @@error <> 0
    Begin    
      rollback
      return 1     
    End

  insert into yyy values(<Invalid Data>)
  if @@error <> 0
   begin
    rollback
    return 2
   end

  insert into zzz values(3)
  if @@error <> 0
   begin
    rollback
    return 3
   end

commit tran
return 0