procedure TForm1.Button1Click(Sender: TObject);
 var
  TableList:TstringList;
  TableName:string;
 begin
   TableName:='Table1';
   try
     TableList:=Tstringlist.Create;
     LogADOConnection1.GetTableNames(TableList);
     if TableList.IndexOf(TableName)>=0 then//如果表存在
        with ADOCommand1 do
          begin
           CommandText:='drop table '+TableName;
           execute;
          end;
   except
     Raise Exception.Create('删除操作失败!');
   end;
 end;