SQLCONNECTION 连接数据库有关问题

SQLCONNECTION 连接数据库问题
SQLCONNECTION
在SQLCONNECTION 控件上 直接 填写 内容 以及PARAMS里的内容,是可以连接到数据库的内容,但是用代码控制 一直提示错误

Exception class EAccessViolation with message 'Access violation at address 01011244 in module 'dbxfb.dll'. Read of address 0013D76F'. Process Project1.exe (2300)


代码 如下:

Delphi(Pascal) code

  with SQLFB do  begin  Connected:=False;  DriverName:='Firebird';  GetDriverFunc:='getSQLDriverINTERBASE';  LibraryName:='dbexpint.dll';  VendorLib:='fbclient.dll';  Params.Values['User_Name']:='sysdba';  Params.Values['Password']:='masterkey';  Params.Values['SQLDialect']:='3';  Params.Values['Interbase TransIsolation']:='ReadCommited';  Params.Values['Database']:='192.168.11.9:D:\HC.fdb';  try  Connected:=True;  Caption:='Connect OK';  except  MessageDlg('Connect Error',mtError,[mbyes],0);  end;  end;

Delphi(Pascal) code

  with SQLFB do begin    Connected:=False;    DriverName:='Firebird';//这行不能写到参数里    GetDriverFunc:='getSQLDriverINTERBASE';    LibraryName:='dbexpint.dll';    VendorLib:='fbclient.dll';    Params.Append('user_name=sysdba');    Params.Append('password=masterkey');    Params.Append('sqldialect=3');    Params.Append('interbase transisolation=readcommited');    Params.Append('database=192.168.11.9:D:\HC.fdb');    try      Connected:=True;      Caption:='Connect OK';    except      MessageDlg('Connect Error',mtError,[mbyes],0);    end;  end;