250 lines
8.2 KiB
Plaintext
250 lines
8.2 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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* Copies the contents of a database to an SDF text file.
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* Appends the contents of an SDF text file to a database.
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*
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* Copyright 2001-2002 David G. Holm <dholm@jsd-llc.com>
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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 "hbcommon.ch"
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#include "fileio.ch"
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#include "error.ch"
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HB_FILE_VER( "$Id$" )
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#define AppendEOL( handle ) FWRITE( handle, CHR( 13 ) + CHR( 10 ) )
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#define AppendEOF( handle ) FWRITE( handle, CHR( 26 ) )
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#define SkipEOL( handle ) FSEEK( handle, 2, FS_RELATIVE )
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PROCEDURE __dbSDF( lExport, cFile, aFields, bFor, bWhile, nNext, nRecord, lRest )
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LOCAL index, handle, cFileName := cFile, nStart, nCount, oErr, nFileLen, aStruct
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// Process the file name argument.
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index := RAT( ".", cFileName )
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IF index > 0
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// The file name might include a file extension.
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IF RAT( "/", cFileName ) > index ;
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.OR. RAT( "\", cFileName ) > index
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// No, the file extension is in a directory name.
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index := 0
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END IF
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END IF
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IF index <= 0
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// No file name extension, so provide the default.
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cFileName += ".txt"
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END IF
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// Determine where to start and how many records to process.
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IF nRecord != NIL
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// The RECORD clause has the highest priority.
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nStart := nRecord
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nCount := 1
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ELSEIF nNext != NIL
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// The NEXT clause has the next highest priority.
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nStart := -1
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nCount := nNext
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ELSEIF bWhile != NIL .OR. lRest
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// The WHILE and REST clauses have equal priority.
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nStart := -1
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nCount := -1
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ELSE
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// Followed by the FOR clause or the ALL clause.
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nStart := 0
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nCount := -1
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END IF
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IF EMPTY( bFor )
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// This simplifies the test that determines whether or not to
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// use (i.e., import or export) any given processed record.
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bFor := {||.T.}
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END IF
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IF lExport
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// COPY TO SDF
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handle := FCREATE( cFileName )
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IF handle == -1
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oErr := ErrorNew()
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oErr:severity := ES_ERROR
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oErr:genCode := EG_CREATE
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oErr:subSystem := "SDF"
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oErr:subCode := 1002
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oErr:description := HB_LANGERRMSG( oErr:genCode )
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oErr:canRetry := .T.
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oErr:canDefault := .T.
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oErr:fileName := cFileName
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oErr:osCode := FERROR()
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Eval(ErrorBlock(), oErr)
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ELSE
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IF nStart > -1
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// Only reposition if a starting record was specified or implied.
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IF nStart == 0
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GO TOP
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ELSE
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GO (nStart)
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END IF
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END IF
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IF EMPTY( bWhile )
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// This simplifies the looping logic.
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bWhile := {||.T.}
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END IF
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// Process the records to copy SDF.
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WHILE EVAL( bWhile ) .AND. ( nCount == -1 .OR. nCount > 0 ) ;
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.AND. !BOF() .AND. !EOF()
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IF EVAL( bFor )
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IF EMPTY( aFields )
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// Process all fields.
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FOR index := 1 TO FCOUNT()
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ExportFixed( handle, FIELDGET( index ) )
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NEXT index
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ELSE
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// Process the specified fields.
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FOR index := 1 TO LEN( aFields )
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ExportFixed( handle, FIELDGET( FIELDPOS( aFields[ index ] ) ) )
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NEXT index
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END IF
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// Set up for the start of the next record.
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AppendEOL( handle )
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END IF
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IF nCount != -1
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nCount--
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END IF
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SKIP
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END WHILE
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AppendEOF( handle )
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FCLOSE( handle )
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END IF
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ELSE
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// APPEND FROM SDF
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handle := FOPEN( cFileName )
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IF handle == -1
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oErr := ErrorNew()
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oErr:severity := ES_ERROR
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oErr:genCode := EG_OPEN
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oErr:subSystem := "SDF"
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oErr:subCode := 1001
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oErr:description := HB_LANGERRMSG( oErr:genCode )
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oErr:canRetry := .T.
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oErr:canDefault := .T.
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oErr:fileName := cFileName
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oErr:osCode := FERROR()
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Eval(ErrorBlock(), oErr)
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ELSE
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IF EMPTY( bWhile )
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// This simplifies the looping logic.
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bWhile := {||.T.}
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END IF
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nFileLen := FSEEK( handle,0,FS_END )
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FSEEK( handle,0 )
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aStruct := DBSTRUCT()
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WHILE FSEEK( handle,0,FS_RELATIVE ) + 1 < nFileLen
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APPEND BLANK
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IF EMPTY( aFields )
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// Process all fields.
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FOR index := 1 TO FCOUNT()
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IF !ImportFixed( handle,index,aStruct )
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EXIT
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ENDIF
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NEXT index
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ELSE
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// Process the specified fields.
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FOR index := 1 TO LEN( aFields )
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IF !ImportFixed( handle,FIELDPOS( aFields[ index ] ),aStruct )
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EXIT
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ENDIF
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NEXT index
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END IF
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// Set up for the start of the next record.
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SkipEOL( handle )
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END WHILE
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FCLOSE( handle )
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END IF
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END IF
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RETURN
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STATIC FUNCTION ExportFixed( handle, xField )
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DO CASE
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CASE VALTYPE( xField ) == "C"
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FWRITE( handle, xField )
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CASE VALTYPE( xField ) == "D"
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FWRITE( handle, DTOS( xField ) )
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CASE VALTYPE( xField ) == "L"
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FWRITE( handle, iif( xField, "T", "F" ) )
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CASE VALTYPE( xField ) == "N"
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FWRITE( handle, STR( xField ) )
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OTHERWISE
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RETURN .F.
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END CASE
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RETURN .T.
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STATIC FUNCTION ImportFixed( handle, index, aStruct )
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LOCAL cBuffer := Space(aStruct[ index,3 ]), pos, res := .T., nRead
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LOCAL vres
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nRead := FREAD( handle, @cBuffer, aStruct[ index,3 ] )
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IF ( pos := At( CHR(13),cBuffer ) ) > 0 .AND. pos <= nRead
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res := .F.
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FSEEK( handle, -( nRead - pos + 1 ), FS_RELATIVE )
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IF pos > 1
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cBuffer := Left( cBuffer,pos-1 )
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ELSE
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RETURN res
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ENDIF
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ENDIF
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DO CASE
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CASE aStruct[ index,2 ] == "D"
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vres := HB_STOD( cBuffer )
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CASE aStruct[ index,2 ] == "L"
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vres := iif( cBuffer == "T",.T.,.F. )
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CASE aStruct[ index,2 ] == "N"
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vres := VAL( cBuffer )
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OTHERWISE
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vres := cBuffer
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END CASE
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FIELDPUT( index, vres )
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RETURN res
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