<?php

class SqlitePage{

  public function __construct()

  {

    $this->table_name='';

    $this->tj='';

    $this->page_size='';

    $this->current_page='';

    $this->total_page='';

    include_once 'sqlite_db.php';

    $this->db=new SqliteDB();//可以调用他的操作方法了

  }

  function entrance($table_name,$page_size,$tj='')//sql中不包含limit  page_size为每页显示条数

  {

    // 首先获取当前页

    // sql = "select * from tab where "+条件+" order by "+排序+" limit "+要显示多少条记录+" offset "+跳过多少条记录;

    $this->page_size=$page_size;

    $this->table_name=$table_name;

    $this->tj=$tj;

    $this->total_page=ceil($this->db->total($this->table_name,$this->tj)/$this->page_size);

    if (!isset($_GET['page'])) {

      $this->current_page=1;//如果没有page，则设置为默认第一页

    }

    else{

      $this->current_page=$_GET['page'];

    }

    if ($this->current_page>$this->total_page) {//当当前页数目大于总页数，则设置当前页数为总页数

      $this->current_page=$this->total_page;

    }

    if ($this->current_page<1) {//当当前页数目大于总页数，则设置当前页数为总页数

      $this->current_page=1;

    }

    $tj=$this->tj.' limit '.$this->page_size.' offset '.($this->current_page-1)*$this->page_size;

    $result=$this->db->query($this->table_name,$tj);

    return $result;

  }

  function page_bar()

  {

    $old_url = $_SERVER["REQUEST_URI"];

    $check = strpos($old_url, '?');

    $pre_urls='test';

    if ($check) {//如果urls中有？

      if(substr($old_url, $check+1) == '')

      { //有问号，但是后面没有跟任何参数

        $first_urls=$old_url.'page=1';//首页

        $pre_urls=$old_url.'page='.($this->current_page-1);//上一页;

        $next_urls=$old_url.'page='.($this->current_page+1);//下一页;

        $end_urls=$old_url.'page='.$this->total_page;//末页

      }

      else {//有问号，并且有参数

        if (isset($_GET['page'])) {//如果参数中包含page参数，则注销这个参数

          unset($_GET['page']);

          $old_url='http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.http_build_query($_GET);

        }

        $first_urls=$old_url.'&page=1';//首页

        $pre_urls=$old_url.'&page='.($this->current_page-1);//上一页;

        $next_urls=$old_url.'&page='.($this->current_page+1);//下一页;

        $end_urls=$old_url.'&page='.$this->total_page;//末页

      }

    }

    else{// 如果没有问号(也就是说后面没有任何参数，则直接跟)

      $first_urls=$old_url.'?page=1';

      $first_urls=$old_url.'?page=1';//首页

      $pre_urls=$old_url.'?page='.($this->current_page-1);//上一页;

      $next_urls=$old_url.'?page='.($this->current_page+1);//下一页;

      $end_urls=$old_url.'?page='.$this->total_page;//末页

    }

    // echo $this->table_name.'table_name';

    return '

    <div class="page">

      <a>【共'.$this->total_page.'页，第'.$this->current_page.'页】</a>

      <a href="'.$first_urls.'" rel="external nofollow" >首页</a>

      <a href="'.$pre_urls.'" rel="external nofollow" >上一页</a>

      <a href="'.$next_urls.'" rel="external nofollow" >下一页</a>

      <a href="'.$end_urls.'" rel="external nofollow" >末页</a>

    </div>

    ';

  }

  public function get_total_page()

  {

    return ceil($this->total_record/$this->page_size);

  }

}

// $page=new PrePage();

// $res=$page->entrance('log',10);

// echo "<hr />";

// foreach ($res as $key => $row) {

// echo $row['urls'].'<br />';

// }

// echo $page->page_bar();

?>