前面列出了MVC中的c和v 一直没有拿出来M，今天贴出来了。

class News_model extends CI_Model{

public function __construct(){

parent::__construct();

$this->load->database();//这调用数据库

}

public function get_news($pn){

$pagesize = 3;

if(!is_numeric($pn)||$pn<1)$pn=1;

$allnum = $this->db->count_all('news');//所有news数据量

if($allnum>0){

$pagemax =ceil($allnum/$pagesize);

$pn = min($pagemax,$pn);

$begin = ($pn-1)*$pagesize;

//条件查询$this->db->get_where('table', array('id' => $id), $limit, $offset);

$query = $this->db->order_by('id','desc')->get('news',$pagesize,$begin);

foreach ($query->result() as $row){

$temp[]=array('id'=>$row->id,'title'=>$row->title);

}

$query->free_result(); //释放资源

$data['list']=$temp;

$data['pagedown'] = $pn+1<$pagemax?$pn+1:$pagemax;

$data['pageup'] = $pn-1>1?$pn-1:1;

$data['pagemax'] = $pagemax;

}else{

$data['list']=$array();

$data['pageup'] = 1;

$data['pagedown'] = 1;

$data['pagemax'] = 1;

}

return $data;

}

public function addaction(){

$this->load->helper('url');

$data['title']=$this->input->post('title');

$data['content']=$this->input->post('content');

return $this->db->insert('news',$data);

}

public function get_news_id($id){

if($id==""||!is_numeric($id)) return false;

$this->db->where('id',$id);

$query = $this->db->get('news');

if($query->num_rows()>0){

return $query->row_array();

}else{

return false;

}

}

public function changeaction($id){

if($id==""||!is_numeric($id)) return false;

$data['title'] = $this->input->post('title');

$data['content'] = $this->input->post('content');

$this->db->where('id',$id);

$this->db->update('news',$data);

return true;

}

}

更多信息请查看IT技术专栏