Solved

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

Posted on 2004-03-30
7
1,547 Views
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 ?
0
Comment
Question by:msl22
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
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
0
 
LVL 75

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
0
 
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
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

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
0
 
LVL 29

Expert Comment

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

Leon
0
 
LVL 2

Accepted Solution

by:
Lunchy earned 0 total points
ID: 10798040
Closed, 250 points refunded.
Lunchy
Friendly Neighbourhood Community Support Moderator
0

Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you have ever used Microsoft Word then you know that it has a good spell checker and it may have occurred to you that the ability to check spelling might be a nice piece of functionality to add to certain applications of yours. Well the code that…
You can of course define an array to hold data that is of a particular type like an array of Strings to hold customer names or an array of Doubles to hold customer sales, but what do you do if you want to coordinate that data? This article describes…
As developers, we are not limited to the functions provided by the VBA language. In addition, we can call the functions that are part of the Windows operating system. These functions are part of the Windows API (Application Programming Interface). U…
Get people started with the process of using Access VBA to control Excel using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Excel. Using automation, an Access application can laun…

717 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question