291 lines
7.6 KiB
Plaintext
291 lines
7.6 KiB
Plaintext
/*
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* $Id$
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*/
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/*
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* Harbour Project source code:
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* __DBTOTAL FUNCTION
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*
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* Copyright 2000 Luiz Rafael Culik <culik@sl.conex.net>
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* www - http://www.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. 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 "set.ch"
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#include "error.ch"
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FUNCTION __DBTOTAL( cFile, xKey, aFields, ;
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xFor, xWhile, nNext, nRec, lRest, rdd ;
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)
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LOCAL CurSelect
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LOCAL NewSelect
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LOCAL aNewDbStruct
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LOCAL aGetField
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LOCAL aFieldsSum
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LOCAL lDbTransRecord
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LOCAL xCurKey
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LOCAL bKeyBlock
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LOCAL bForBlock
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LOCAL bWhileBlock
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LOCAL cset
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LOCAL flag_err
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LOCAL err_block
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LOCAL cAlias
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LOCAL wRec
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LOCAL err
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cAlias := TmpAlias()
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err_block := Errorblock( { | x | Break( x ) } )
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flag_err := .F.
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cset := Set( _SET_CANCEL, .f. )
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IF ( Valtype( xWhile ) == "C" )
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bWhileBlock := "{||" + xWhile + "}"
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bWhileBlock := &bWhileBlock
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ELSE
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IF ( Valtype( xWhile ) != "B" )
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bWhileBlock := { || .t. }
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ELSE
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bWhileBlock := xWhile
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lRest := .T.
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ENDIF
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ENDIF
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IF ( Valtype( xFor ) == "C" )
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bForBlock := "{||" + xFor + "}"
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bForBlock := &xFor
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ELSE
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IF ( Valtype( xFor ) != "B" )
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bForBlock := { || .t. }
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ELSE
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bForBlock := xFor
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ENDIF
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ENDIF
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Iif( lRest == NIL, .F., lRest )
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IF ( nRec != NIL )
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GOTO nRec
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nNext := 1
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ELSE
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IF ( nNext == NIL )
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nNext := - 1
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ELSE
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lRest := .T.
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ENDIF
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IF ( !lRest )
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GOTO TOP
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ENDIF
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ENDIF
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CurSelect := SELECT()
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aNewDbStruct := {}
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Aeval( Dbstruct(), { | _1 | Iif( _1[ 2 ] == "M", NIL, Aadd( aNewDbStruct, _1 ) ) } )
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IF ( Empty( aNewDbStruct ) )
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RETURN ( .F. )
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ENDIF
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BEGIN SEQUENCE
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IF ( Empty( xKey ) )
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xKey := Indexkey()
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ENDIF
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IF ( Empty( xKey ) )
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Set( _SET_CANCEL, cset )
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err := errorNew()
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err:description := "invalid argument"
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err:genCode := EG_ARG
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Eval( Errorblock(), err )
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ENDIF
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IF ( Valtype( xKey ) == "C" )
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bKeyBlock := "{||" + xKey + "}"
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bKeyBlock := &bKeyBlock
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ELSE
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IF ( Valtype( xKey ) != "B" )
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bKeyBlock := { || .t. }
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ELSE
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bKeyBlock := xKey
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ENDIF
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ENDIF
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aGetField := {}
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Aeval( aFields, { | _1 | Aadd( aGetField, getfield( _1 ) ) } )
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aFieldsSum := Array( Len( aGetField ) )
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Dbcreate( cFile, aNewDbStruct, rdd )
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USE ( cFile ) NEW EXCLUSIVE Alias ( cAlias ) via ( rdd )
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NewSelect := SELECT()
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SELECT( CurSelect )
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WHILE ( !Eof() .and. nNext != 0 .and. Eval( bWhileBlock ) )
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lDbTransRecord := .F.
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Afill( aFieldsSum, 0 )
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xCurKey := Eval( bKeyBlock )
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WHILE ( !Eof() .and. nNext -- != 0 .and. Eval( bWhileBlock ) .and. ;
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xCurKey == Eval( bKeyBlock ) ;
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)
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IF ( Eval( bForBlock ) )
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IF ( !lDbTransRecord )
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wRec := dbRead()
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SELECT( NewSelect )
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Dbappend()
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dbwrite( wRec )
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SELECT( CurSelect )
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lDbTransRecord := .T.
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ENDIF
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Aeval( aGetField, { | _1, _2 | aFieldsSum[ _2 ] := aFieldsSum[ _2 ] + ;
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Eval( _1 ) ;
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} ;
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)
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ENDIF
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SKIP
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ENDDO
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IF ( lDbTransRecord )
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SELECT( NewSelect )
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Aeval( aGetField, { | _1, _2 | Eval( _1, aFieldsSum[ _2 ] ) } )
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SELECT( CurSelect )
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ENDIF
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ENDDO
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RECOVER USING err
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flag_err := .t.
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ENDSEQUENCE
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IF ( NewSelect != NIL )
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SELECT( NewSelect )
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CLOSE
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ENDIF
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SELECT( CurSelect )
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Set( _SET_CANCEL, cset )
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Errorblock( err_block )
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IF ( flag_err )
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err:operation += "/__DBTOTAL"
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Eval( Errorblock(), err )
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ENDIF
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RETURN ( .t. )
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STATIC FUNCTION TMPALIAS()
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LOCAL i
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LOCAL alias := "_tmp"
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i := 1
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WHILE SELECT( alias ) != 0
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alias += Alltrim( Str( i ) )
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i ++
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ENDDO
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RETURN alias
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STATIC FUNCTION GETFIELD( cField )
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LOCAL nPos
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LOCAL SelectFromField
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LOCAL CurSelect
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LOCAL err
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LOCAL lErr
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CurSelect := SELECT()
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IF ( ( nPos := At( "->", cField ) ) > 0 )
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SelectFromField := Left( cField, nPos - 1 )
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IF ( Select( SelectFromField ) != CurSelect )
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err := ErrorNew()
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err:severity := ES_ERROR
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err:gencode := EG_SYNTAX
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err:subsystem := "DBCMD"
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err:candefaul := .T.
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err:operation := cField
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err:subcode := 1101
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lErr := Eval( Errorblock(), err )
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IF ( Valtype( lErr ) != "L" .or. lErr )
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ENDIF
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BREAK( err )
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ENDIF
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cField := Substr( cField, nPos + 2 )
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ENDIF
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RETURN ( Fieldblock( cField ) )
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STATIC FUNCTION DbWrite( w )
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LOCAL ncount
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FOR ncount := 1 TO Len( w )
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Fieldput( ncount, w[ ncount ] )
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NEXT
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RETURN nil
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STATIC FUNCTION DbRead()
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LOCAL cAlias := Alias()
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LOCAL aRec := Array( Fcount() )
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LOCAL nCount
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FOR nCount := 1 TO Fcount()
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aRec[ nCount ] := Fieldget( nCount )
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NEXT
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RETURN aRec
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