Problem in compacting Access 2007 Database, After Compacting Access 2007 Database gets converted to Access 2002-2003 format.

Question

I am using a Delphi procedure to Compact Access Database

Code sniphet of procedure is:

procedure CompactDatabase(pFullDatabasePathName : string; pLoginName : string = '';    pPassword : string = ''; pSystemDb : string = '');

var
  JE            : TJetEngine;

  sdbTemp       : String;

  sdbTempConn   : String;

  sdbSrcConn    : String;

  loginString   : String;

  systemDbString: String;

  compactDone   : Boolean;

  const
    SProviderAccess2007 = 'Provider=Microsoft.ACE.OLEDB.12.0;Data Source=';

    SEngine = ';Jet OLEDB:Engine Type=';
    Access2007EngineType = '5';

 begin

  loginString := '';

  if (pLoginName <> '') then
    loginString := ';User Id= ' + pLoginName + '; Password = ' + pPassword;

  if ((pLoginName = '') and (pPassword <> '')) then
    loginString := ';Jet OLEDB:Database Password = ' + pPassword;


  systemDbString := '';

  if (pSystemDb <> '') then
    systemDbString := ';Jet OLEDB:System Database = ' + pSystemDb;


    try
      compactDone := False;
      JE := TJetEngine.Create(Application);

      sdbTemp := ExtractFileDir(pFullDatabasePathName) + '\TEMP' + ExtractFileName(pFullDatabasePathName);

      if FileExists(sdbTemp) then
        DeleteFile(sdbTemp);


      //Access 2007
      if not compactDone then
        begin
          try
            sdbSrcConn := SProviderAccess2007 + pFullDatabasePathName + loginString + systemDbString + SEngine + Access2007EngineType;
            sdbTempConn := SProviderAccess2007 + sdbTemp + SEngine + Access2007EngineType;
          JE.CompactDatabase(sdbSrcConn, sdbTempConn);
            compactDone := True;
          except
          end;
        end;

      if not compactDone then
        Raise Exception.Create('Compacting of database: ' + pFullDatabasePathName + 'failed!');

      if (not DeleteFile(pFullDatabasePathName)) then
        Raise Exception.Create('Compacting failed because cannot delete database: ' +  pFullDatabasePathName);

      if (not RenameFile(sdbTemp, pFullDatabasePathName)) then
        Raise Exception.Create('Compacting failed because cannot overwrite database: ' +  pFullDatabasePathName + ' by temporary compacted database: ' +   sdbTemp);

        if FileExists(sdbTemp) then
          DeleteFile(sdbTemp);

  finally
    JE.FreeOnRelease;
  end;
 end;

The outcome of this procedure is the Compact Access Database, but in Access 2002-2003 format.

I am unable to get the problem area. Is some dll or regsitry settings needs to be renewed? Please help...

Answer 1

Sorry, I don't know Delphi. Running this VBA code from Access 2007 creates a compacted copy which is an actual ACCDB (rather than MDB) format file.

DBEngine.CompactDatabase "D:\wip\Sample.accdb", "D:\wip\DeleteMe.accdb",,dbVersion120

dbVersion120 is a named constant whose value is 128.

Answer 2

Hi Guys, Thanks 4 ur support, I found a working solution to this problem and found it worth sharing with you.

Now instead of using Jet 4, I am now using 'DAO.DBEngine.120'.

  //Access 2007 
  if not compactDone then 
    begin 
      try
       // DaoAccess2007 is OleVariant Type

        DaoAccess2007 := CreateOleObject('DAO.DBEngine.120');
        DaoAccess2007.CompactDatabase(pFullDatabasePathName,sdbTemp); 
        compactDone := True; 
      except 
      end; 
    end;

The outcome is the Compacted Databsae in Access 2007 Format. Cheers!