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ADODB.Recordset : Copy filtered row + updates row + Save as XML => The xml file contains the update statement...

Posted on 2004-03-30
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Last Modified: 2013-12-25
Hi,

I'm working with VB6 (sp3).
And I found a weird problem when trying to save a recordset as XML file.

1. Create a recordset, load data in it and filter on a subset of rows.
    ------------------------------------------------------------------------
    dim rs as ADODB.Recordset
    dim rsCopy as ADODB.Recordset
    ....

2. Copy the filtered rows (not clone)
    ------------------------------------------------------------------------
  dim strm as new ADODB.stream
   
  Set strm = New ADODB.stream
  rs.Save strm
  rsCopy.Open strm
 
3. Updates a row
    ------------------------------------------------------------------------          
    rsCopy.MoveFirst
    For i = 0 To rsCopy.Fields.Count - 1
        'replace null value by an empty string
        rsCopy.Fields.item(i).Value = "" & rsCopy.Fields.item(i).Value
    Next i

4. Save as XML file
    ------------------------------------------------------------------------          
    rsCopy.Save "C:\Test.xml", adPersistXML

5. Open the XML file
    ------------------------------------------------------------------------          
    you see the update....  and this format is not supported by crystal report...  
...
<rs:update>
    <rs:original>
       <z:row OID='17900' c1='' c2='Mar 29 2004  3:17PM' c3='' c4='' c5='' c6='' c7='' c8='' c9='' c10='' c11=''
                         c12='' c13='' c14='29-17-04' c15='' c16='' Usuario='' c18=''/>
    </rs:original>
    <z:row OID='17900' c1='' c2='Mar 29 2004  3:17PM' c3='' c4='' c5='' c6='' c7='' c8='' c9='' c10='' c11='' c12=''
                   c13='' c14='29-17-04' c15='' c16='' Usuario='' c18=''/>
</rs:update>
<z:row OID='17910' c2='Mar 29 2004  3:17PM' c14='29-17-04' Usuario='' c18=''/>
...

6. Why I replace null value by an empty string ?
    ------------------------------------------------------------------------    
 This is because I use the XML file as source for my Crystal reports. And the columns containing null values are not
 exported in the XML file...

7. Any solutions ???
    ------------------------------------------------------------------------    
- How to avoid to keep trace of the update ?
or
- How to export the column with only null value in the XML file ?
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Question by:msl22
7 Comments
 
LVL 27

Expert Comment

by:Dabas
ID: 10719545
Hi msl22,
Just a shot in the dark, but who knows?
Have you tried setting "Convert Null Field Value to Default" in CR (File -> Report Options)?

Dabas
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Expert Comment

by:Anthony Perkins
ID: 10726231
Please maintain these old open questions.
1 08/13/2003 500 Crystal report doesn't show the report  Open Crystal Reports
2 02/19/2004 125 LINUX/APACHE/JSP : Calling a batch file ...  Open JSP
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LVL 29

Expert Comment

by:leonstryker
ID: 10765570
What is your backend database? Can you use the CASE WHEN THEN syntax to return a recordset which already does not have any NULL values?

Leon
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Author Comment

by:msl22
ID: 10767119
Hi Dabas and leonstryker,

I finally found that the problem occured only when the recordset have been build from a stream...
I used to use a stream to copy only the filtered records of a recordset.

Public Sub Recordset_CopyFilteredRecords(p_rsSource As ADODB.Recordset, ByRef p_rsCopy As ADODB.Recordset)
    Dim stream As ADODB.stream
    Set stream = New ADODB.stream
   
    'save the filtered result in a stream
    p_rsSource.Save stream, adPersistXML
   
    'open the recordset with the stream
    p_rsCopy.Open stream
   
    'free memory
    stream.Close
    Set stream = Nothing
End Sub

And working with the p_rsCopy, causes to keep all modification made when saving it as XML...

But I found that, when saving my data as adPersistXML it is only saving the filtered data... so I don't need anymore to use this procedure.

Thanks for your help !

Mary
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Expert Comment

by:leonstryker
ID: 10767473
No problem.  Please close this question.

Leon
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