Mysql ADO and TDataRow

[Maurizio]

Hello Rao ,

I have a table with a field AUTO_INCREMENT ( Es. NUMBER ) , sometimes I need to replace a value in NUMBER ( which doesn't exist ) .

If I do it with ADO command it works
Es: oRs:Fields( "NUMBER" ):Value := 15

but if I do with TdataRow I have a error .
Es:
oRec:NUMBER := 15
oRec:Save()

I think that the problem is in METHOD dr_FieldPut( cnfld, uVal ) CLASS TDataRow

Code: Select all  Expand view

    ...  
     if ::lReadOnly .or. ( Len( ::aData[ fld ] ) > 2 .and. ::aData[ fld, 3 ] == .f. )
         return ::error(  HB_LangErrMsg( 39 ), ::className(), ::FieldName( fld ), 39, { uVal } )
   ...
 

Is it possible tDataRow works in the same way as ADO ?

Maurizio

[nageswaragunupudi]

We made autoinc field readonly both in XBrowse and TDatRow. We also made it difficult to change it.

Still you can make the field read-write as below

oRec:aData[ oRec:FieldPos( "NUMBER" ), 3 ] := .T.

But the real question is why there can be blank values in an autoinc field? We should never let it happen.

[Maurizio]

Thanks Rao ,

When I need to use your advice .

<< But the real question is why there can be blank values in an autoinc field? We should never let it happen.

I have to put a real values not a blank values .

Maurizio

[nageswaragunupudi]

Please download 17.06 again

oRec:FieldReadOnly( "NUMBER", .F. )

[Maurizio]

Thanks Rao ,

If I use

oRec := TDataRow():New( oRs, nil, .t.)
oRec:FieldReadOnly( "NUMBER", .F. )

I have this error when append a record

Code: Select all  Expand view

 Time from start: 0 hours 0 mins 14 secs
   Error occurred at: 28/06/2017, 11:10:08
   Error description: (DOS Error -2147352567) WINOLE/1007  Un handle di riga fa riferimento a una riga eliminata o a una riga contrassegnata per l'eliminazione. (0x80040E23): Microsoft Cursor Engine

Stack Calls
===========
   Called from:  => TOLEAUTO:VALUE( 0 )
   Called from: .\source\classes\DATAROW.PRG => TDATAROW:READADO( 694 )
   Called from: .\source\classes\DATAROW.PRG => TDATAROW:SAVEADO( 1191 )
   Called from: .\source\classes\DATAROW.PRG => TDATAROW:SAVE( 1011 )

Regards Maurizo

[nageswaragunupudi]

I just now tested with this

Code: Select all  Expand view

  oCn   := FW_DemoDB( "ADO" )
   oRs   := FW_OpenRecordSet( oCn, "select * from states" )
   XBROWSER oRs  // note down last ID
   oRec  := TDataRow():New( oRs, nil, .t. )
   oRec:FieldReadOnly( "ID", .f. )
   oRec:Edit()
 

This is working fine for me if
1) I leave ID as 0
OR
2) If I enter a value for ID, which is already not there in the Table

If I enter an existing value for ID I get error
Your error seems to be for some other reason
Please try my sample above

[Maurizio]

I try your sample but with the same error.
https://drive.google.com/file/d/0By2KWCeRZL0pSU5VaFZwRU4wU2M/view?usp=sharing

Maurizio

[nageswaragunupudi]

I request you to please try exactly my sample using the FW server and the table. Not with your table.
Then let me see where the problem is

[Maurizio]

Sorry Rao ,

I use

Code: Select all  Expand view

#include "FiveWin.ch"
Function Main()
    oCn   := FW_DemoDB( "ADO" )
   oRs   := FW_OpenRecordSet( oCn, "select * from states" )
   XBROWSER oRs  // note down last ID
   oRec  := TDataRow():New( oRs, nil, .t. )
   oRec:FieldReadOnly( "ID", .f. )
   oRec:Edit()
   
   Return nil

https://drive.google.com/file/d/0By2KWC ... sp=sharing

If I write a real number in ID ( Es: 60) I have the same error

Maurizio