Question

moving data from one cursor to another in separate data sessions

Asked by: afentonjm

Can i move data from one cursor to another if they are in different data sessions, if it's possible how do i do this. (VFP 7)

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Asked On
2004-05-28 at 10:26:12ID21006011
Tags

vfp

Topic

FoxPro Database

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Answers

 

by: CaptainCyrilPosted on 2004-05-28 at 14:05:25ID: 11184231

As long as one of the data sessions is not private.

SELECT cursor2
APPEND FROM DBF('cursor1') && append from another cursor

or

SELECT * FROM cursor1 INTO CURSOR cursor2 && query one cursor into another but will make it readonly

or

SELECT * FROM cursor1 INTO CURSOR cursor2 READWRITE && query one cursor into another (VFP 8.0)

or

SELECT cursor1
COPY TO temp && copy to dbf

SELECT cursor2
APPEND FROM temp && append from dbf
DELETE FILE temp.dbf

 

by: afentonjmPosted on 2004-05-28 at 15:03:19ID: 11184571

Is there no no way to move it to a private data session from the default.

 

by: GhunaimaPosted on 2004-05-28 at 22:39:17ID: 11185878

The cursor you are calling must be public, you can move somm or all of itx contents to any private session. The point is that you should have access to the data you are querying.

 

by: cbasozPosted on 2004-05-29 at 05:18:08ID: 11186778

Cursors are also tables on disk but a session has exclusive access to it. In other words you can't directly pass cursors between sessions but you can pass objects between sessions. If your cursor has data to fit in an array :

Set DataSession to _screen.DatasessionID
select myCursor
copy to array aTransfer
Set DataSession to thisform.DatasessionID
select myCursor
append from array aTransfer

ie:

Select * From customer Into Cursor myCursor
Public oForm
oForm = Createobject('myForm') && oForm has private data session
oForm.Show

Define Class myForm As Form
    DataSession = 2
    Add Object cmdGetData As CommandButton With ;
        Caption = 'Get Data From Another Session', ;
        AutoSize = .T.
    Add Object myGrid As Grid With Top = 30, ColumnCount=2

    Procedure Init
        Create Cursor crsLocal (Cust_id c(6), Company c(40))
        This.myGrid.RecordSource = 'crsLocal'
    Endproc

    Procedure cmdGetData.Click
          Local lnSession
          
        With Thisform.myGrid
            .RecordSource = ''

            lnSession = thisform.DataSessionId
            Set DataSession To _Screen.DataSessionId
            Select myCursor
            Copy To Array aTransfer
            Set DataSession To m.lnSession
            Insert into crsLocal from Array aTransfer
            Select crsLocal
            locate

            .RecordSource = 'crsLocal'
        Endwith
    Endproc
Enddefine

With objects you might transfer huge cursors too but generally there is no need to make huge transfers between sessions.

 

by: theSliverPosted on 2004-05-29 at 06:33:49ID: 11187051

If there's too much data to transfer using arrays and copying the cursor to an intermediate temporary file seems too slow then you could go back to record oriented processing.

Set DataSession to nCopyFromSession
select copyCursor
scan
       scatter memvar memo
       Set DataSession to nDestinationSession
       inssert into destCursor from memvar
       Set DataSession to nCopyFromSession
endscan

Or altenatively again, use copyCursor again in 0  
In the destination data session.

 

by: CaptainCyrilPosted on 2004-05-29 at 14:12:08ID: 11188732

I still suggest to copy to an external file and close the file and then open the file from the other form. Did not try it. Usually I have Public data in my forms.

20120131-EE-VQP-002

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