在下面这个delphi连接以及操作mysql数据库中，我们以最简单展示，没有考虑异常等情况，我在其中加了两个按钮，一个是连接数据库，一个是从连接的数据库查询一个数据，


源码下载地址：http://download.csdn.net/detail/cq20110310/6854069

mysql：表student，字段name


unit uTest1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, DB, ADODB, StdCtrls;

type

  TFormDB = class(TForm)
    btn1: TButton;
    Button1: TButton;
    ADOConn: TADOConnection;
    ADOQuery:TADOQuery;
    procedure btn1Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  FormDB: TFormDB;

implementation

{$R *.dfm}

procedure TFormDB.btn1Click(Sender: TObject);
var
  strConn:string;
begin
  ADOConn:=TADOConnection.Create(Self);
  strConn:='DRIVER={MySQL ODBC 5.1 Driver};SERVER=127.0.0.1;DATABASE=delphi_test1;UID=root;PASSWORD=OMSDB;OPTION=3;PORT=3306;';
  ADOConn.ConnectionString:=strConn;

  ADOConn.Open;

  if ADOConn.Connected then
  begin
    ShowMessage('连接数据库成功');
  end

  else
  begin
    ShowMessage('连接数据库失败');
  end;   



end;

procedure TFormDB.Button1Click(Sender: TObject);
var
  strSQL:string;

begin
  ADOQuery:=TADOQuery.Create(Self);

  ADOQuery.Connection:=ADOConn;


  strSQL:='select * from student ';

  ADOQuery.SQL.Add(strSQL);

  ADOQuery.Open;

  ShowMessage(ADOQuery.FieldByName('name').AsString);


end;

end.