function CompactDatabase(AFileName,APassWord:string):boolean;
//压缩与修复数据库,覆盖源文件
const
  SConnectionString = 'Provider=Microsoft.Jet.OLEDB.4.0;Data Source=%s;'
      +'Jet OLEDB:Database Password=%s;';
var
  SPath,SFile:Array [0..254] Of Char;
  STempFileName:String;
  JE:OleVariant;
begin
  GetTempPath(40,SPath);
//取得Windows的Temp路径
  GetTempFileName(SPath,'~CP',0,SFile);
//取得Temp文件名,Windows将自动建立0字节文件
  STempFileName:=SFile;//PChar->String
  DeleteFile(STempFileName);
//删除Windows建立的0字节文件
  try
    JE:=CreateOleObject('JRO.JetEngine');
//建立OLE对象,函数结束OLE对象超过作用域自动释放
    OleCheck(JE.CompactDatabase(format(SConnectionString,[AFileName,APassWord]),
        format(SConnectionString,[STempFileName,APassWord])));
//压缩数据库
//复制并覆盖源数据库文件,如果复制失败则函数返回假,压缩成功但没有达到函数的功能
    result:=CopyFile(PChar(STempFileName),PChar(AFileName),false);
    DeleteFile(STempFileName);
//删除临时文件
  except
    result:=false;
//压缩失败
  end;
end;