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172 lines
4.9 KiB
Plaintext
172 lines
4.9 KiB
Plaintext
/*
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* Harbour Project source code:
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* __dbJoin() function
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*
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* Copyright 2005 Pavel Tsarenko <tpe2@mail.ru>
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* www - http://harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING.txt. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
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*
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* As a special exception, the Harbour Project gives permission for
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* additional uses of the text contained in its release of Harbour.
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*
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* The exception is that, if you link the Harbour libraries with other
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* files to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the Harbour library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the Harbour
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* Project under the name Harbour. If you copy code from other
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* Harbour Project or Free Software Foundation releases into a copy of
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* Harbour, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for Harbour, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*
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*/
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#include "dbstruct.ch"
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/* NOTE: Compared to CA-Cl*pper, Harbour has three extra parameters
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(cRDD, nConnection, cCodePage). */
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FUNCTION __dbJoin( cAlias, cFile, aFields, bFor, cRDD, nConnection, cCodePage )
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LOCAL nMaster := Select()
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LOCAL nDetail := Select( cAlias )
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LOCAL nResult
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LOCAL aStruct
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LOCAL aJoinList
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LOCAL oError
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LOCAL lError := .F.
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dbSelectArea( nMaster )
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IF Empty( aStruct := __FieldTwo( cAlias, aFields ) )
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RETURN .F.
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ENDIF
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BEGIN SEQUENCE
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dbCreate( cFile, aStruct, cRDD, .T., "", NIL, cCodePage, nConnection )
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nResult := Select()
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aJoinList := __JoinList( nMaster, nDetail, nResult, aStruct )
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dbSelectArea( nMaster )
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dbGoTop()
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DO WHILE ! Eof()
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dbSelectArea( nDetail )
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dbGoTop()
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DO WHILE ! Eof()
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dbSelectArea( nMaster )
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IF Eval( bFor )
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__doJoinList( aJoinList )
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ENDIF
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dbSelectArea( nDetail )
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dbSkip()
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ENDDO
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dbSelectArea( nMaster )
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dbSkip()
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ENDDO
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RECOVER USING oError
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lError := .T.
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END SEQUENCE
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IF nResult != NIL
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dbSelectArea( nResult )
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dbCloseArea()
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ENDIF
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dbSelectArea( nMaster )
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IF lError
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Break( oError )
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ENDIF
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RETURN .T.
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STATIC FUNCTION __FieldTwo( cAlias, aFields )
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LOCAL aFldTemp
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LOCAL bFind
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LOCAL aStruct
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LOCAL cField
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IF Empty( aFields )
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RETURN dbStruct()
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ENDIF
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aFldTemp := {}
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AEval( aFields, {| cFld | AAdd( aFldTemp, RTrim( Upper( cFld ) ) ) } )
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aFields := aFldTemp
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aStruct := {}
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bFind := {| cFld | cFld == cField }
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AEval( dbStruct(), {| aFld | cField := aFld[ DBS_NAME ], ;
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iif( AScan( aFields, bFind ) == 0, NIL, AAdd( aStruct, aFld ) ) } )
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Select( cAlias )
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bFind := {| cFld | "->" $ cFld .AND. SubStr( cFld, At( "->", cFld ) + 2 ) == cField }
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AEval( dbStruct(), {| aFld | cField := aFld[ DBS_NAME ], ;
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iif( AScan( aFields, bFind ) == 0, NIL, AAdd( aStruct, aFld ) ) } )
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RETURN aStruct
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STATIC FUNCTION __JoinList( nMaster, nDetail, nResult, aStruct )
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LOCAL aList := {}
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LOCAL nPos
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LOCAL i
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FOR i := 1 TO Len( aStruct )
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IF ( nPos := ( nMaster )->( FieldPos( aStruct[ i ][ DBS_NAME ] ) ) ) != 0
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AAdd( aList, { nResult, nMaster, nPos, i } )
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ELSEIF ( nPos := ( nDetail )->( FieldPos( aStruct[ i ][ DBS_NAME ] ) ) ) != 0
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AAdd( aList, { nResult, nDetail, nPos, i } )
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ENDIF
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NEXT
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RETURN aList
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STATIC PROCEDURE __doJoinList( aList )
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LOCAL aJoin
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IF Len( aList ) > 0
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( aList[ 1 ][ 1 ] )->( dbAppend() )
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FOR EACH aJoin IN aList
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( aJoin[ 1 ] )->( FieldPut( aJoin[ 4 ], ( aJoin[ 2 ] )->( FieldGet( aJoin[ 3 ] ) ) ) )
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NEXT
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ENDIF
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RETURN
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