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getting nextval from Oracle sequence

Posted on 2009-07-15
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Last Modified: 2013-11-27
I am trying to obtain nextval from my Oracle sequence.  My ODBC driver is Oracle in OraHome92, not Microsoft ODBC for Oracle for which the attached code snippet was written.  I have tried to modify to use the driver I need.
Basically, my first choice would be to use the dsn I created via the Control Panel's ODBC Data Source Administrator as it references the TNS service name and does not store the user id or password.
I have created a pass-through query via QueryDesigner where I can even specify the ds name used by all the other linked tables, but I can't figure out how to use the query to get the value inot a text field so that when the insert to Oracle occurs, there will be a value for the tables PK.
Thanks for any help.

Option Compare Database

Function AssignNextVal() As Long

    Dim db As Database

    Dim LPassThrough As QueryDef

    Dim Lrs As DAO.Recordset

    Dim LSQL As String
 

    On Error GoTo Err_Execute

    Set db = CurrentDb()

       Set LPassThrough = db.CreateQueryDef("qryTemp")

     

    LPassThrough.Connect = "ODBC;Driver={Oracle in OraHome92};Dbq=ECODS_Product_Admin;Uid=*****;Pwd=*****"

    LPassThrough.SQL = "Select STG_XLS.SEQ_CONSOLIDATED_MAPPING_KEY.nextval as CONSOLIDATED_MAPPING_ID From Dual"

    LPassThrough.ReturnsRecords = True
 

    Set Lrs = LPassThrough.OpenRecordset(dbOpenSnapshot)
 

    'Retrieve NextVal from Oracle sequence

    If Lrs.EOF = False Then

        AssignNextVal = Lrs("NV")

    Else

        AssignNextVal = 0

    End If
 

    'Remove query definition when done

    CurrentDb.QueryDefs.Delete "qryTemp"
 

    Exit Function
 

Err_Execute:
 

    'Remove query definition when done

    CurrentDb.QueryDefs.Delete "qryTemp"
 

    'Return 0 if an error occurred

    AssignNextVal = 0
 

End Function

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Question by:Greg_Beam
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8 Comments
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24866788
what error do you get
0
 

Author Comment

by:Greg_Beam
ID: 24869398
The error message is "Runtime error '3146'  ODBC-call failed"

What do you think of this approach?  I would like to not include my password.  

Why do some people wnat to avoid a dsn?  

Thanks,
Greg
0
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24871647
what if you do this:
If Lrs.EOF and Lrs.BOF Then

  AssignNextVal = 0

Else

  AssignNextVal = Lrs.Fields("CONSOLIDATED_MAPPING_ID").Value

End If

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LVL 142

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 24871665
anyhow, if you create the querydef just to delete it afterwards, I would do it a less intensive method
Option Compare Database

Function AssignNextVal() As Long

    Dim db As ADODB.Connection 

    Dim Lrs As ADODB.Recordset

    Dim LSQL As String

 

    On Error GoTo Err_Execute

    Set db = new adodb.connection     

    db.open "Driver={Oracle in OraHome92};Dbq=ECODS_Product_Admin;Uid=*****;Pwd=*****"
 

    LSQL = "Select STG_XLS.SEQ_CONSOLIDATED_MAPPING_KEY.nextval as CONSOLIDATED_MAPPING_ID From Dual"

 

    Set Lrs = db.execute(LSQL)

 

    'Retrieve NextVal from Oracle sequence

    If Lrs.EOF and lrs.bof Then

        AssignNextVal = 0

    Else

        AssignNextVal = Lrs("CONSOLIDATED_MAPPING_ID").Value

    End If

    Lrs.Close

    db.Close

 

    Exit Function

 

Err_Execute:

 

    'Return 0 if an error occurred

    AssignNextVal = 0

 

End Function

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Author Comment

by:Greg_Beam
ID: 24872220
Yes!!! That works!

May ask how I could avoid using my id and password, that is, use the existing ODBC connection instead of creating a new one?

Greg
0
 

Author Closing Comment

by:Greg_Beam
ID: 31604069
angelii,
I am very have to have a solution, I know nothing about this area.  But I would still prefer a solution that does not involve hard-coding a password.
Thanks again,
Greg
0
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24876040
you cannot avoid the password, unless you can use windows authentication.
http://msdn.microsoft.com/en-us/library/dd788095(BTS.10).aspx
0
 

Author Comment

by:Greg_Beam
ID: 24877651
Ok, thanks.

Also, I put the function as the default value of the field containing the PK.  So the combo box, I think, on the form presents the existing Id from existing rows, but calls the function for new rows that do not yet an Id assigned.  I was looking for an event to trigger calliing the function, and didn't find a good one.   This works well.

I am a first-time user of EE and I think it is very nice!  Thanks again angelll!
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