delphi7连接mysql5的实现方法

unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, DBXpress, FMTBcd, StdCtrls, Grids, DB, SqlExpr;
type
 TForm1 = class(TForm)
  SQLConnection1: TSQLConnection;
  SQLQuery1: TSQLQuery;
  StringGrid1: TStringGrid;
  Button1: TButton;
  Button2: TButton;
  Button3: TButton;
  Label1: TLabel;
  procedure Button1Click(Sender: TObject);
  procedure Button2Click(Sender: TObject);
  procedure Button3Click(Sender: TObject);
 private
  { Private declarations }
 public
  { Public declarations }
 end;
 
var
 Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.Button1Click(Sender: TObject);
begin
 SQLConnection1 := TSQLConnection.Create(nil);
 SQLConnection1.DriverName := 'dbxmysql';
 SQLConnection1.GetDriverFunc := 'getSQLDriverMYSQL50';
 SQLConnection1.LibraryName := 'dbxopenmysql50.dll';
 SQLConnection1.VendorLib := 'libmysql.dll';
 SQLConnection1.LoginPrompt := false;
 SQLConnection1.Params.Append('Database=mysql');
 SQLConnection1.Params.Append('User_Name=root');
 SQLConnection1.Params.Append('Password=');
 SQLConnection1.Params.Append('HostName=localhost');
 SQLConnection1.Open;
 if SQLConnection1.Connected = true then
 begin
  SQLQuery1.SQLConnection := SQLConnection1;
  Label1.Caption := 'success!';
 end
 else
  Label1.Caption := 'failed!';
end;
 
procedure TForm1.Button2Click(Sender: TObject);
var
 i, j: Integer;
begin 
 SQLQuery1.SQL.Clear;
 SQLQuery1.SQL.Add('SELECT * FROM user');
 SQLQuery1.Active := true;
 i := 0;
 SQLQuery1.First;
 while not SQLQuery1.eof do
 begin
  for j := 0 to SQLQuery1.FieldCount - 1 do
   StringGrid1.cells[j, i] := SQLQuery1.Fields[j].AsString;
  SQLQuery1.next;
  inc(i);
 end;
 SQLQuery1.Active := false;
end;
 
procedure TForm1.Button3Click(Sender: TObject);
begin
 if SQLConnection1.Connected = true then
  SQLConnection1.Close;
 SQLConnection1.Free;
end;
 
end.