'id>5 and id<9'

$user=M('user');
$data['username']='liwenkai';
$list=$user->where(array('username'=>'liwenkai'))->select();
$list=$user->where($data)->select();

$user=M('user');
$a=new stdClass();
$a->username='liwenkai';
$list=$user->where($a)->select();  

$data['字段名']=array('是表达式','查询条件');

$data['liwenkai']='liwenkai';

$data['liwenkai']=array('eq','liwenkai');

$data['username']=array('like','peng%');
$list=$user->where($data)->select();

$user=M('user');
$data['id']=array(array('gt',20),array('lt',23),'and');
$list=$user->where($data)->select();
dump($list);

$data['username']=array(array('like','p%'),array('like','h%'),'or');

$user=M('user');
$data['username']='pengyanjie';
$data['password']=array('eq','pengyanjie');
$data['id']=array('lt',30);
$data['_logic']='or';
$list=$user->where($data)->select();
dump($list);

$user=M('user');
$data['username']=array('eq','pengyanjie');
$data['password']=array('like','p%');
$data['_logic']='or';
$where['_complex']=$where;
$where['id']=array('lt',30);
$list=$user->where($data)->select();
dump($list);

(id<30)and ( (username=pengyanjie) or (password like p%) )

echo $user->count();
echo '<br>';
echo $user->max('id');
echo '<br>';
echo $user->where('id<30')->min('id');
echo '<br>';
echo $user->avg('id');
echo '<br>';
echo $user->sum('id');

$user=new AdvModel('user');//实例化高级模型AdvModel
//$user=M('user','CommonModel');//或者将AdvModel用CommonModel来继承
$list=$user->order('id desc')->getN(2);//返回结果中的第三条
dump($list);

$list=$user->order('id desc')->last();//返回最后一条
$list=$user->order('id desc')->first();//返回第一条

$Model = new Model() // 实例化一个 model 对象  没有对应任何数据表
$Model->execute( "update think_user set name='thinkPHP' where status=1" );

$user=M();
$list=$user->query('select * from aoli_user order by id desc');
dump($list);         

$user=M('user');
$list=$user->getByusername('pengyanjie');
$list=$user->getByusername('pengyanjie');
dump($list);

$user=new AdvModel('user');
$list=$user->top5();//前5条
dump($list);