Detailed explanation of paging function examples implemented by PHP based on SQLite

This article mainly introduces the paging function implemented by PHP based on SQLite. It analyzes the relevant techniques and precautions for PHP to operate the SQLite database to implement the paging function based on specific examples. It is necessary Friends can refer to

This article describes the paging function implemented by PHP based on SQLite. Share it with everyone for your reference, the details are as follows:

The database file used here is the SQLite## in the previous article "SQLite operation class implemented by PHP based on PDO [including operations such as addition, deletion, modification, query, and transaction]" #Database operation class. Without further ado, let’s go straight to the code:

<meta charset=&#39;utf-8&#39;>
<?php
class SqlitePage{
  public function construct()
  {
    $this->table_name=&#39;&#39;;
    $this->tj=&#39;&#39;;
    $this->page_size=&#39;&#39;;
    $this->current_page=&#39;&#39;;
    $this->total_page=&#39;&#39;;
    include_once &#39;sqlite_db.php&#39;;
    $this->db=new SqliteDB();//可以调用他的操作方法了
  }
  function entrance($table_name,$page_size,$tj=&#39;&#39;)//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[&#39;page&#39;])) {
      $this->current_page=1;//如果没有page，则设置为默认第一页
    }
    else{
      $this->current_page=$_GET[&#39;page&#39;];
    }
    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.&#39; limit &#39;.$this->page_size.&#39; offset &#39;.($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, &#39;?&#39;);
    $pre_urls=&#39;test&#39;;
    if ($check) {//如果urls中有？
      if(substr($old_url, $check+1) == &#39;&#39;)
      { //有问号，但是后面没有跟任何参数
        $first_urls=$old_url.&#39;page=1&#39;;//首页
        $pre_urls=$old_url.&#39;page=&#39;.($this->current_page-1);//上一页;
        $next_urls=$old_url.&#39;page=&#39;.($this->current_page+1);//下一页;
        $end_urls=$old_url.&#39;page=&#39;.$this->total_page;//末页
      }
      else {//有问号，并且有参数
        if (isset($_GET[&#39;page&#39;])) {//如果参数中包含page参数，则注销这个参数
          unset($_GET[&#39;page&#39;]);
          $old_url=&#39;http://&#39;.$_SERVER[&#39;HTTP_HOST&#39;].$_SERVER[&#39;PHP_SELF&#39;].&#39;?&#39;.http_build_query($_GET);
        }
        $first_urls=$old_url.&#39;&page=1&#39;;//首页
        $pre_urls=$old_url.&#39;&page=&#39;.($this->current_page-1);//上一页;
        $next_urls=$old_url.&#39;&page=&#39;.($this->current_page+1);//下一页;
        $end_urls=$old_url.&#39;&page=&#39;.$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.&#39;?page=1&#39;;
      $first_urls=$old_url.&#39;?page=1&#39;;//首页
      $pre_urls=$old_url.&#39;?page=&#39;.($this->current_page-1);//上一页;
      $next_urls=$old_url.&#39;?page=&#39;.($this->current_page+1);//下一页;
      $end_urls=$old_url.&#39;?page=&#39;.$this->total_page;//末页
    }
    // echo $this->table_name.&#39;table_name&#39;;
    return &#39;
    <p class="page">
      <a>【共&#39;.$this->total_page.&#39;页，第&#39;.$this->current_page.&#39;页】</a>
      <a href="&#39;.$first_urls.&#39;" rel="external nofollow" >首页</a>
      <a href="&#39;.$pre_urls.&#39;" rel="external nofollow" >上一页</a>
      <a href="&#39;.$next_urls.&#39;" rel="external nofollow" >下一页</a>
      <a href="&#39;.$end_urls.&#39;" rel="external nofollow" >末页</a>
    </p>
    &#39;;
  }
  public function get_total_page()
  {
    return ceil($this->total_record/$this->page_size);
  }
}
// $page=new PrePage();
// $res=$page->entrance(&#39;log&#39;,10);
// echo "<hr />";
// foreach ($res as $key => $row) {
// echo $row[&#39;urls&#39;].&#39;<br />&#39;;
// }
// echo $page->page_bar();
?>

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