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Corrupt tables
Message
From
30/05/2006 05:34:28
 
 
To
29/05/2006 11:31:12
Metin Emre
Ozcom Bilgisayar Ltd.
Istanbul, Turkey
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Title:
Environment versions
Visual FoxPro:
VFP 8 SP1
OS:
Windows XP
Network:
Windows 2000 Server
Database:
Visual FoxPro
Miscellaneous
Thread ID:
01125635
Message ID:
01125787
Views:
13
Hi,

Thanks for all the replies.
I used the command: set tablevalidate to 0
Then I packed and reindexed (can't remember in which order, I tried it a few times) and it worked. Sent the files back to the client and everything is working fine again.

Thanks again for the help,


>Hi Mark,
>
>If your customer getting "table corrupt" error:
>
>
>set tablevalidate to 0
>rename my_table.dbf to my_table_Backup.dbf
>use my_table_backup
>copy to my_table for !delete()
>
>
>If your customer getting "not a database table" error. You can use different table fix applications. One of these is Cetin Basoz's :
>
>*-------- metin in eki ------
>lPARAMETERS xtable
>  LOCAL xrepair
>  xrepair=CREATEOBJECT("_repair")
>  xrepair.repairheaderandmemo(m.xtable)
>*-------- end metin in eki ------
>
>Define CLASS _repair AS custom
>*-- Reads given size of bytes at offsett specified by pos from a file opened
>  Procedure readbytes
>**************************************************************************
>* ReadBytes(nHandle, nPos, nBytes[, lLR]) :
>*   Reads given size of bytes at offsett specified by pos from a file opened
>*   with low level functions (handle comes from that function)
>* Parameters :
>*   nHandle : (Numeric) Handle of a file to read bytes from
>*   nPos    : (Numeric) File offsett to start reading
>*   nBytes  : (Numeric) Byte count to read
>*   (typically 1 for single byte, 2 for word and 4 for dword)
>*   lLR     : (Logical)
>*             if .T. left-to-right format used
>*   (Default) if .F. right-to-left format used
>*             (more likely to be used with low level)
>* EXAMPLE :
>* ReadBytes(handle,12,2)     - returns 62313 if bytes at offset 12 are ( 69 F3 )
>* ReadBytes(handle,12,2,.T.) - returns 62313 if bytes at offset 12 are ( F3 69 )
>* Remark :
>* Doesn't save and restore current file pos. Caller should take care of it
>**************************************************************************
>  Lparameters tnHandle, tnPos, tnSize, tlLR
>  Local lcString, lnRetValue,ix
>  =fseek(tnHandle, tnPos,0) && Go to pos
>  lcString = fread(tnHandle, tnSize) && Read tnSize bytes
>  lnRetValue = 0
>  For ix=0 to tnSize-1  && Convert to a number
>    lnRetValue = lnRetValue + asc(substr(lcString,ix+1)) * ;
>      iif(tlLR,256^(tnSize-1-ix),256^ix)
>  Endfor
>  Return int(lnRetValue)
>Endproc
>
>
>*-- Writes integer with given size of bytes at offsett specified by pos to a file opened
>  Procedure writebytes
>**************************************************************************
>* WriteBytes
>* Same as ReadBytes except writes to file
>* 64 bits not available in this version
>**************************************************************************
>  Lparameters tnHandle, tnPos, tnSize, tnNumber, tlLR
>  Local lcString, lnLowDword, lnHighDword,ix
>  lcString=''
>  If tlLR
>    For ix=tnSize-1 to 0 step -1
>      lcString=lcString+chr(tnNumber/256^ix%256)
>    Endfor
>  Else
>    For ix=0 to tnSize-1
>      lcString=lcString+chr(tnNumber/256^ix%256)
>    Endfor
>  Endif
>  =fseek(tnHandle, tnPos,0) && Go to pos
>  Return fwrite(tnHandle,lcString)
>Endproc
>
>
>*-- Repairs the header of a table and its memo. Frees the table removing backlink info and clears out has CDX flag.
>  Procedure repairheaderandmemo
>* RepairHeaderAndMemo
>* Parameters
>*	tcDBF          : Full path and name of dbf file to repair
>* Remarks :
>*   Table is freed (backlink info cleared if exists)
>*   Has CDX flag is cleared && New copy has no CDX
>  Lparameters tcDBF
>  Local handle, lnFileSize, lnReccount, lnHeaderSize, lnRecordSize, ;
>    lnCalculatedReccount, llHasMemo
>  handle=fopen(tcDBF,12) && Opened readwrite
>  lnFileSize = fseek(handle,0,2) && Get file size
>* Read header info
>  With this
>    lnReccount   = .readbytes(handle, 4,4)
>    lnHeaderSize = .readbytes(handle, 8,2)
>    lnRecordSize = .readbytes(handle,10,2)
>
>    lnCalculatedReccount = floor((lnFileSize-(lnHeaderSize+1))/lnRecordSize)
>
>*-------- metin in müdahalesi ------
>if lnCalculatedReccount<0
>  lnCalculatedReccount=0
>ENDIF
>*-------- end metin in müdahalesi ------
>
>    If lnCalculatedReccount # lnReccount && If calculated # recorded fix it
>      .writebytes(handle, 4,4,lnCalculatedReccount)
>    Endif
>    .writebytes(handle, 28,1,0) && Clear has CDX, has memo, isDBC flags
>    =fseek(handle,lnHeaderSize-263 ,0)        && Go backlink info start
>    =fwrite(handle,replicate(chr(0),263),263) && Clear backlink info and free table
>    llHasMemo=file(forceext(tcDBF,'FPT'))
>    If llHasMemo
>      .RepairMemo(forceext(tcDBF,'FPT'))
>      .writebytes(handle, 28,1,0x02) && Set has memo flag
>    Endif
>  Endwith
>  =fclose(handle)
>Endproc
>
>*-- Fixes next block pointer, blocksize and filesize
>  Procedure RepairMemo
>* RepairMemo
>* Simply fixes next block pointer, blocksize and filesize
>  Lparameters tcMemoFilename
>  Local handle, lnFileSize, lnNextBlockPointer, lnBlockSize, lnFirstBlock, lnCalculatedFileSize
>
>  handle=fopen(tcMemoFilename,12) && Opened readwrite
>  lnFileSize = fseek(handle,0,2) && Get file size
>  With this
>* Read header info
>    lnNextBlockPointer = .readbytes(handle, 0,4,.T.) && Stored in left-to-right format
>    lnBlockSize        = .readbytes(handle, 6,2,.T.) && Stored in left-to-right format
>
>* Specific to me - no blocksize setting to something other than default 0x40
>    If lnBlockSize # 0x40
>      .writebytes(handle, 6,2,0x40,.T.)
>      lnBlockSize=0x40
>    Endif
>*
>    lnFirstBlock	   = ceiling(512/lnBlockSize) && Possible min lnNextblockpointer
>    lnCalculatedFileSize = lnNextBlockPointer*lnBlockSize
>
>* Fix if needs repair
>    If !(lnFileSize >= 512 ;
>        and lnNextBlockPointer >= lnFirstBlock ;
>        and lnCalculatedFileSize >= lnFileSize) && Memo needs repair
>
>      lnNextBlockPointer = max(lnNextBlockPointer, lnFirstBlock)
>      lnFileSize = lnNextBlockPointer * lnBlockSize
>      .writebytes(handle, 0,4,lnNextBlockPointer,.T.) && Fix next block pointer
>      =fchsize(handle, lnFileSize) && Fix filesize
>    Endif
>  Endwith
>  =fclose(handle)
>Endproc
>Enddefine
>
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