Clase TDb o TDatabase....cual usar?

[Compuin]

Saludos foros,

Estoy migrando una aplicacion que utiliza TDb para manejar DBF, pero se que hay una clase TDatabase.

Mi duda es si deberia dejar la TDb o pasar a TDatabase....cual es mejor o ambas trabajan de la misma manera?

Atento a sus comentarios

[Antonio Linares]

Puedes copiar aqui el código de la Clase TDb que usas ? Asi lo podemos comparar

[Compuin]

#INCLUDE "FIVEWIN.CH"
#define _DbSkipper DbSkipper

//----------------------------------------------------------------------------//

CLASS TDb

DATA nArea AS NUMERIC INIT 0
DATA lBuffer
DATA lShared AS LOGICAL INIT .t.
DATA aBuffer
DATA bBoF, bEoF, bNetError AS CODEBLOCK
DATA cAlias, cFile, cDriver AS String INIT ""
DATA lReadOnly AS LOGICAL INIT .f.
DATA lOemAnsi
DATA lTenChars AS LOGICAL INIT .t.
DATA aFldNames AS Array
DATA oBookMark AS OBJECT
DATA lBlank AS LOGICAL INIT .f.

METHOD New( cAlias ) CONSTRUCTOR

METHOD Activate()

METHOD AddIndex( cFile, cTag ) INLINE ( ::nArea )->( OrdListAdd( cFile, cTag ) )
MESSAGE AnsiToOem METHOD _AnsiToOem()
METHOD Append() INLINE ( ::nArea )->( DbAppend() )
METHOD Blank( nRecNo ) INLINE ( ::nArea )->( nRecNo := RecNo(),;
DBGoBottom(), ;
DBSkip( 1 ), ;
::Load(.t.),;
DBGoTo( nRecNo ),;
::lBlank := .t. )
METHOD Bof() INLINE ( ::nArea )->( BoF() )
METHOD Close() INLINE ( ::nArea )->( DbCloseArea() )
METHOD SetScope( n, xVar) INLINE ( ::nArea )->( OrdScope( n, xVar ) )
METHOD OrdKeyNo( n, xVar) INLINE ( ::nArea )->( OrdKeyNo() )
METHOD ClrScope( n ) INLINE ( ::nArea )->( OrdScope( n, NIL ) )
METHOD CloseIndex() INLINE ( ::nArea )->( OrdListClear() )
METHOD Commit() INLINE ( ::nArea )->( DBCommit() )

METHOD Create( cFile, aStruct, cDriver ) ;
INLINE DbCreate( cFile, aStruct, cDriver )

METHOD CreateIndex( cFile, cTag, cKey, bKey, lUnique) INLINE ;
( ::nArea )->( OrdCreate( cFile, cTag, cKey, bKey, lUnique ) )

METHOD ClearRelation() INLINE ( ::nArea )->( DbClearRelation() )

METHOD DbCreate( aStruct ) INLINE DbCreate( ::cFile, aStruct, ::cDriver )

METHOD Deactivate() INLINE ( ::nArea )->( DbCloseArea() ), ::nArea := 0

METHOD Eval( bBlock, bFor, bWhile, nNext, nRecord, lRest ) ;
INLINE ( ::nArea )->( DBEval( bBlock, bFor, ;
bWhile, nNext, nRecord, ;
lRest ) )

MESSAGE Delete METHOD _Delete()
METHOD Deleted() INLINE ( ::nArea )->( Deleted() )

METHOD DeleteIndex( cTag, cFile ) INLINE ( ::nArea )->( OrdDestroy( cTag, cFile ) )

METHOD Eof() INLINE ( ::nArea )->( EoF() )

METHOD FCount() INLINE ( ::nArea )->( FCount() )

MESSAGE FieldGet METHOD _FieldGet( nField )

METHOD FieldName( nField ) INLINE ( ::nArea )->( FieldName( nField ) )

METHOD FieldPos( cFieldName ) INLINE ( ::nArea )->( FieldPos( cFieldName ) )

MESSAGE FieldPut METHOD _FieldPut( nField, uVal )

METHOD Found() INLINE ( ::nArea )->( Found() )

METHOD GetBookMark()

METHOD GoTo( nRecNo ) INLINE ( ::nArea )->( DBGoTo( nRecNo ) ),;
If( ::lBuffer, ::Load(), )

METHOD GoTop() INLINE ( ::nArea )->( DBGoTop() ),;
If( ::lBuffer, ::Load(), )
METHOD GoBottom() INLINE ( ::nArea )->( DBGoBottom() ),;
If( ::lBuffer, ::Load(), )

METHOD IndexKey( ncTag, cFile ) INLINE ( ::nArea )->( OrdKey( ncTag, cFile ) )
METHOD IndexName( nTag, cFile ) INLINE ( ::nArea )->( OrdName( nTag, cFile ) )
METHOD IndexBagName( nInd ) INLINE ( ::nArea )->( OrdBagName( nInd ) )
METHOD IndexOrder( cTag, cFile ) INLINE ( ::nArea )->( OrdNumber( cTag, cFile ) )

METHOD LastRec( nRec ) INLINE ( ::nArea )->( LastRec() )

METHOD Load()

METHOD Lock() INLINE ( ::nArea )->( FLock() )
METHOD Modified()

MESSAGE OemToAnsi METHOD _OemToAnsi()
METHOD Pack() INLINE ( ::nArea )->( DbPack() )
METHOD ReCall() INLINE ( ::nArea )->( DBRecall() )

METHOD RecCount() INLINE ( ::nArea )->( RecCount() )
METHOD RecLock() INLINE ( ::nArea )->( RLock() )
METHOD RecNo() INLINE ( ::nArea )->( RecNo() )
METHOD Save()

METHOD SetBuffer( lOnOff )

METHOD SetBookMark()

METHOD Seek( uExp, lSoft )

METHOD SetOrder( cnTag, cFile ) INLINE ( ( ::nArea )->( OrdSetFocus( cnTag, cFile ) ) )

METHOD SetRelation( ncArea, cExp ) INLINE ;
( ::nArea )->( DbSetRelation( ncArea, Compile( cExp ), cExp ) )

METHOD Skip( nRecords )
METHOD Skipper( nRecords )

METHOD UnLock() INLINE ( ::nArea )->( DBUnLock() )

METHOD Used() INLINE ( ::nArea )->( Used() )
METHOD Insert()
METHOD Zap() INLINE ( ::nArea )->( DbZap() )

METHOD Debug()
METHOD NewObj()
METHOD LoadObj()
METHOD SaveObj()
METHOD SetBrowse()
METHOD Count() INLINE (::nArea)->(RecCount())
METHOD Fin() INLINE (::nArea)->(DBCloseArea())
METHOD SetFocus() INLINE (Select(::cAlias))
ERROR HANDLER OnError( uParam1 )

ENDCLASS

//---------------------------------------------------------------------------//

METHOD New( cAlias ) CLASS TDb
local n, oClass, aDatas := {}, aMethods := {}
local nWorkArea

nWorkArea := Select( cAlias )

::nArea = nWorkArea
::cAlias = Alias( nWorkArea )
::cFile = Alias( nWorkArea )
::cDriver = ( Alias( nWorkArea ) )->( DbSetDriver() )
::lShared = .t.
::lReadOnly = .f.
::lBuffer = .t.
::lOemAnsi = .f.

::bNetError = { || MsgStop( "Record in use", "Please, retry" ) }

::aFldNames = {}
for n = 1 to ( ::cAlias )->( FCount() )
AAdd( ::aFldNames, ( ::cAlias )->( FieldName( n ) ) )
next

::Load()

return Self

//----------------------------------------------------------------------------//

METHOD Activate() CLASS TDb

local nOldArea:= Select()

Select ( ::nArea )
if ! Used()
DbUseArea( .f., ::cDriver, ::cFile, ::cAlias, ::lShared, ::lReadOnly )
endif

Select ( nOldArea )

return nil

//----------------------------------------------------------------------------//

METHOD _AnsiToOem() CLASS TDb

local n

for n = 1 to Len( ::aBuffer )
if ValType( ::aBuffer[ n ] ) == "C"
::aBuffer[ n ] = AnsiToOem( ::aBuffer[ n ] )
endif
next

return nil

//----------------------------------------------------------------------------//

METHOD _Delete() CLASS TDb

if ::lShared
if ::Lock()
( ::nArea )->( DbDelete() )
::UnLock()
else
MsgAlert( "DataBase in use", "Please try again" )
endif
else
( ::nArea )->( DbDelete() )
endif

return nil

//---------------------------------------------------------------------------//

METHOD _FieldPut( nPos, uValue ) CLASS TDb

if ::lBuffer
::aBuffer[ nPos ] := uValue
else
if ::lShared
if ::RecLock()
( ::nArea )->( FieldPut( nPos, uValue ) )
::UnLock()
else
if ! Empty( ::bNetError )
return Eval( ::bNetError, Self )
endif
endif
else
( ::nArea )->( FieldPut( nPos, uValue ) )
endif
endif

return nil

//----------------------------------------------------------------------------//

METHOD _FieldGet( nPos ) CLASS TDb

if ::lBuffer
return ::aBuffer[ nPos ]
else
return ( ::nArea )->( FieldGet( nPos ) )
endif

return nil

//---------------------------------------------------------------------------//

static function Compile( cExp )
return &( "{||" + cExp + "}" )

//----------------------------------------------------------------------------//

METHOD Load() CLASS TDb
local n

if ::lBuffer
if Empty( ::aBuffer )
::aBuffer = Array( ::FCount() )
endif

for n = 1 to Len( ::aBuffer )
::aBuffer[ n ] = ( ::nArea )->( FieldGet( n ) )
next

if ::lOemAnsi
::OemToAnsi()
endif
endif

return nil

//----------------------------------------------------------------------------//

METHOD Modified() CLASS TDb

local cField, nFor

for nFor := 1 to Len( ::aFldNames )

cField = ( ::cAlias )->( FieldName( nFor ) )

if ( ::cAlias )->( FieldGet( nFor ) ) != ::aBuffer[ nFor ]
return .t.
endif

next

return .f.

//----------------------------------------------------------------------------//

METHOD _OemToAnsi() CLASS TDb

local n

for n = 1 to Len( ::aBuffer )
if ValType( ::aBuffer[ n ] ) == "C"
::aBuffer[ n ] = OemToAnsi( ::aBuffer[ n ] )
endif
next

return nil

//----------------------------------------------------------------------------//

METHOD OnError( uParam1 ) CLASS TDb
local cMsg := __GetMessage()
local nError := If( SubStr( cMsg, 1, 1 ) == "_", 1005, 1004 )
local nField

if ::lTenChars .and. Len( SubStr( cMsg, 2 ) ) == 9
cMsg = Upper( cMsg )
if SubStr( cMsg, 1, 1 ) == "_"
if ( nField := AScan( ::aFldNames,;
{ | cField | SubStr( cMsg, 2 ) == ;
RTrim( SubStr( cField, 1, 9 ) ) } ) ) != 0
::FieldPut( nField, uParam1 )
else
_ClsSetError( _GenError( nError, ::ClassName(), SubStr( cMsg, 2 ) ) )
endif
else
if( ( nField := ::FieldPos( cMsg ) ) != 0 )
return ::FieldGet( nField )
else
_ClsSetError( _GenError( nError, ::ClassName(), cMsg ) )
endif
endif
return nil
endif

if SubStr( cMsg, 1, 1 ) == "_"
if( ( nField := ::FieldPos( SubStr( cMsg, 2 ) ) ) != 0 )
::FieldPut( nField, uParam1 )
else
_ClsSetError( _GenError( nError, ::ClassName(), SubStr( cMsg, 2 ) ) )
endif
else
if( ( nField := ::FieldPos( cMsg ) ) != 0 )
return ::FieldGet( nField )
else
_ClsSetError( _GenError( nError, ::ClassName(), cMsg ) )
endif
endif

return nil

//----------------------------------------------------------------------------//

METHOD Seek( uExpr, lSoft ) CLASS TDb

local lFound

DEFAULT lSoft := Set( _SET_SOFTSEEK )

lFound = ( ::nArea )->( DbSeek( uExpr, lSoft ) )

if ::lBuffer
::Load()
endif

return lFound

//----------------------------------------------------------------------------//

METHOD SetBuffer( lOnOff ) CLASS TDb

DEFAULT lOnOff := .t.

if lOnOff != nil
::lBuffer = lOnOff
endif

if ::lBuffer
::Load()
else
::aBuffer := nil
endif

return ::lBuffer

//----------------------------------------------------------------------------//

METHOD Save() CLASS TDb

local n

if ::lBuffer
if ! ( ::nArea )->( EoF() )
if ::lShared
if ::RecLock()
for n := 1 to Len( ::aBuffer )
if ::lOemAnsi .and. ValType( ::aBuffer[ n ] ) == "C"
( ::nArea )->( FieldPut( n, AnsiToOem( ::aBuffer[ n ] ) ) )
else
( ::nArea )->( FieldPut( n, ::aBuffer[ n ] ) )
endif
next
::UnLock()
else
if ! Empty( ::bNetError )
return Eval( ::bNetError, Self )
else
MsgAlert( "Record in use", "Please, retry" )
endif
endif
else
for n := 1 to Len( ::aBuffer )
if ::lOemAnsi .and. ValType( ::aBuffer[ n ] ) == "C"
( ::nArea )->( FieldPut( n, AnsiToOem( ::aBuffer[ n ] ) ) )
else
( ::nArea )->( FieldPut( n, ::aBuffer[ n ] ) )
endif
next
endif
endif
endif

return nil

//----------------------------------------------------------------------------//

METHOD Skip( nRecords ) CLASS TDb

local n

DEFAULT nRecords := 1

( ::nArea )->( DbSkip( nRecords ) )

if ::lBuffer
::Load()
endif

if ::Eof()
if ::bEoF != nil
Eval( ::bEoF, Self )
endif
endif

if ::BoF()
if ::bBoF != nil
Eval( ::bBoF, Self )
endif
endif

return nil

//----------------------------------------------------------------------------//

METHOD Skipper( nRecords ) CLASS TDb

local nSkipped

DEFAULT nRecords := 1

nSkipped = ( ::nArea )->( _DbSkipper( nRecords ) )

if ::lBuffer
::Load()
endif

return nSkipped

//----------------------------------------------------------------------------//

METHOD SetBookMark() CLASS TDb
//::Load()
//::Debug()
::oBookMark := TBookMark():New( Self )
::oBookMark:Set()

RETURN Self

//----------------------------------------------------------------------------//

METHOD GetBookMark() CLASS TDb

::cAlias := ::oBookMark:cAlias
::SetOrder( ::oBookMark:cnIndex )
::goto( ::oBookMark:nRecno )
::aBuffer := AClone( ::oBookMark:aBuffer )

//Self := ::oBookMark:oDb


//::Debug()

RETURN Self

//----------------------------------------------------------------------------//

METHOD Debug() CLASS TDb
LOCAL i, cText
cText := ""

FOR i := 1 TO LEN( ::aBuffer )
//cText += xType( ::aBuffer[i] ) + CRLF
NEXT i

MsgInfo( cText )
RETURN .T.

//----------------------------------------------------------------------------//

METHOD NewObj() CLASS TDb
::Blank()
::SetBookMark()
RETURN TObjDb():New( Self, .T. )

//----------------------------------------------------------------------------//

METHOD LoadObj() CLASS TDb
::Load()
::SetBookMark()
RETURN TObjDb():New( Self, .F. )


//----------------------------------------------------------------------------//

METHOD SaveObj( oData ) CLASS TDb
::GetBookMark()
::aBuffer := AClone( oData:aBuffer )

IF oData:lNuevo
::Append()
ENDIF

::Save()
RETURN NIL
//----------------------------------------------------------------------------//
METHOD SetBrowse(oLbx) CLASS TDb
oLbx:bGotop := { || ::GoTop() }
oLbx:bGoBottom := { || ::GoBottom()}
oLbx:bSkip := { |nRec| ::Skipper( nRec ) }
oLbx:bLogicLen := { || ::RecCount() }
// oLbx:nHeaderHeight := 20
// oLbx:nLineHeight := 20
RETURN oLbx
//----------------------------------------------------------------------------//
METHOD Insert() CLASS TDb
LOCAL lOk:=.f.
(::nArea)->(DBAppend())
IF !NetErr()
::Save()
lOk:=.t.
ENDIF
RETURN lOk

FUNCTION DbPack()
PACK
RETURN NIL

FUNCTION DbZap()
ZAP
RETURN NIL

function DbSkipper( x )

return __DbSkipper( x )

[Antonio Linares]

Es bastante similar a la Clase TDataBase, por lo que no debería haber problemas en que la uses.

Falta el código de la Clase TBookMark en el código que has publicado, para ver que hace.

[Compuin]

#INCLUDE "FIVEWIN.CH"

// ------------------------------------------------------------------- //

CLASS TBookMark


DATA cAlias
DATA aBuffer
DATA aFld
DATA oDb
DATA nRecno
DATA cnIndex

METHOD New() CONSTRUCTOR
METHOD Set()

END CLASS

// ------------------------------------------------------------------- //

METHOD New( oDataBase ) CLASS TBookMark
::oDb := oDatabase
RETURN Self

// ------------------------------------------------------------------- //

METHOD Set() CLASS TBookMark
Self:cAlias := ::oDb:cAlias
Self:aBuffer := AClone( ::oDb:aBuffer )
Self:nRecno := ::oDb:RecNo()
Self:cnIndex := ::oDb:SetOrder()
RETURN Self

[Antonio Linares]

Simple e interesante, gracias!

[Compuin]

Antonio,

No entendi el mensaje

[Antonio Linares]

Me refiero que al revisar el código fuente de la Clase TBookMark me ha gustado el concepto y creo que puede ser interesante el usarlo

Basicamente es como sacar una "foto" de un momento de uso de un objeto database, anotando posición del registro, el tag activo del índice, el buffer con la copia del registro, el nombre del alias, etc. Util para guardar un "estado" y poder "regresar" a él

[Compuin]

Excelente,

En conclusion esta Clase TDb se comporta tan bien o mejor que la TDatabase?

[Antonio Linares]

Mi consejo es que uses la Clase TDataBase de FiveWin Revisa FWH/samples/dbf01.prg

está más avanzada y muy probada. Me referia antes a que el concepto de bookmarks es algo que se le podria añadir facilmente

[Compuin]

Ok,

Gracias Antonio, luego te dejo saber

Saludos