Question

Help, any ideas??

I am using the OLEDB adapter (Oracle OLEDB) with Oracle 10.2.0.3.0. My code generates the SQL for the query, then when I execute it into an OLEDBDataReader, the HasRows is False. However, if I output the contents of the query string, copy, and paste into SQL+ (logged in as the same user from the same client machine), it returns 993 rows. What gives??

Here’s a segment of my code:

Dim DB As New OleDb.OleDbConnection(String.Format("{0};Password={1}", ConnectionString, DBPassword))
Dim flowQuerySQL As String
'... code to generate query
Debug.Print(flowQuerySQL)
Dim flowQueryCMD As New OleDb.OleDbCommand(flowQuerySQL, DB)
Dim flowQuery As OleDb.OleDbDataReader = flowQueryCMD.ExecuteReader()
While flowQuery.HasRows
    '...handle rows
End While

The debug.print statement shows:

SELECT CLASS_ID, OBJECT_ID FROM TDM_SF_PROCESS WHERE CLASS_ID=853 AND TDM_END_TIME >= '01-Jan-2009' AND TDM_END_TIME < '31-May-2009' AND TDM_STATUS <> 1 AND TDM_STATUS <> 2

Answer 1

I have just recently started working VB.NET against Oracle, and dates are tempermental.

This approach has worked for me so far:

SELECT CLASS_ID, OBJECT_ID 
FROM TDM_SF_PROCESS 
WHERE CLASS_ID=853 
  AND TDM_END_TIME >= TO_DATE('01-Jan-2009', 'DD-Mon-YYYY') 
  AND TDM_END_TIME < TO_DATE('31-May-2009', 'DD-Mon-YYYY') 
  AND TDM_STATUS <> 1 
  AND TDM_STATUS <> 2 

It wouldn’t work until I used the “TO_DATE” function. Hopefully this will work for you, too.

I’m a MS-SQL guy, so I haven’t been able to research the “why” of why this works, yet. Enlightenment, anyone?