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HomeBackend DevelopmentPHP Tutorial一个可查询所有表的“通用”查询分页类_PHP


一个可查询所有表的“通用”查询分页类 最近突发奇想,希望写出一个可以针对所有表的查询分页类。因为在实际的开发中,恐怕查询并将结果集分页显示是用得最多的代码,而表的结构是多样的,我想尽可能地提高代码的重用率和维护性。
以下是我写的,请各位加以指点,测试,看能否进行更好的改进和更多的支持。
目前还只支持单一的表,不支持联合查询。但未来可以会考虑如何支持。

代码:
/****************************************************************
这个类主要是解决针对很多表的简单数据查询,还在完善中。希望广大网友多提意见和建议。

我的目的是开发出一个几乎可以适用于所有mysql表的查询并将结果集分页的类。
可以自动识别查询中要显示的字段值。

在此,特别声明,要感谢chinaunix的朋友,特别是PHP版的网友们长期以来给我的帮助。
特别要提的是NightKids,一直以来,他都给了我无私的帮助,甚至是他的源代码。

这个类可以被任何人自由引用,使用,修改。但请保留这段文字。
使用这个类造成的一切损失,都与作者tonera无关。

我还在考虑,对于一些复杂的联合查询,可以派生一个类,重新构造sql实现。
这个类没有考虑更多的显示风格,你可以自己构造。
*****************************************************************/
class browser{
   var $c_table;   //要查询的表名
   var $c_rows;   //要显示的行数
   var $c_lation;   //查询的条件
   var $c_order;   //排序的条件
   var $c_result;   //查询的数据连接句柄
   var $c_query;   //最终构造的查询
   var $c_found;   //结果集
   var $c_error;   //错误收集器
   var $c_offset;   //分页显示的偏移量
   var $total;      //结果集的总数

   //连接数据库
   function connect(){
      include '../connect.inc.php';
      if ($connection==false){
         $this->c_error.="没有连接上数据库。
";
         exit;
      }
      $this->c_result=$connection;
   }

   //构造函数,初始化变量
   function browser($tablename,$row,$sql,$lation,$orderby){
      $this->c_table=$tablename;
      $this->c_rows=$row;
      if(empty($this->c_offset)){
         $this->c_offset=0;
      }
      if (empty($tablename) or empty($row) or empty($sql)){
         $this->c_error="没有查询的表或没有批定显示多少行或没有查询语句
";
      }
      $this->c_query=$sql;
      if (!empty($lation)){
         $this->c_query.=" ".$lation;
      }
      if (!empty($orderby)){
         $this->c_query.=" ".$orderby;
      }
   }

   //计算总页数
   function TatolPage(){
      $sult=mysql_query("select count(*) as 'total_rows' from $this->c_table",$this->c_result);
      if ($sult==false) {
         $this->c_error.="计算结果集总数目的查询失败,请检查。
";
         exit;
      }
      $tempvar=mysql_fetch_array($sult);
      $this->total=$tempvar[0];
   }

   //查询得到结果集,存入数组c_found[][]中
   function GetFound(){
      $sult=mysql_query($this->c_query,$this->c_result) or die(mysql_error());
      while ($found=mysql_fetch_array($sult)){
         $this->c_found[]=$found;
      }
   }

   //查询数据,并将结果分页存入一个变量
   function ShowTable(){

      $this->connect();
      $this->TatolPage();

      if (empty($_GET[offset])){
         $_GET[offset]=0;
      }
      $this->c_query.=" limit ".$_GET[offset].", ".$this->c_rows;
      $sult=mysql_query($this->c_query,$this->c_result) or die(mysql_error());

      //解析query,得到要显示出来的字段值
      $tempvar=explode(" ",$this->c_query);
      $fields=explode(",",$tempvar[1]);   //字段值(数组)

      //显示数据到一个表
      $echo_content.="";
      while($found=@mysql_fetch_array($sult)){
         $echo_content.="";
         //显示用户指定的字段,此处需仔细看
         for($i=2;$i            $echo_content.="";
         }
         $echo_content.="";
      }

      //分页
      if ($this->c_rows==0){
         $this->c_error.="每页显示的数目不能为0";
         exit;
      }
      $total_page=ceil($this->total/$this->c_rows);
      $pre_page=$_GET[offset]-$this->c_rows;
      //下一页
      $nex_page=$_GET[offset]+$this->c_rows;
      //显示上一页
      if ($pre_page>=0){
         $echo_content.="";
      }else{
         $echo_content.="&下页";
      }
      $echo_content.="
";
         $echo_content.="".$found[1]."
".$found[$i]."
上页&";
      }else{
         $echo_content.="
上页&";
      }
      //显示页码
      for($i=1;$i         if ($_GET[offset]/$this->c_rows==($i-1)){
            $echo_content.="&第".$i."页&";
         }else{
            $echo_content.="&c_rows.">".$i."&";
         }
      }
      //显示下一页
      if ($nex_page!=0 and ($_GET[offset]+$this->c_rows)total){
         $echo_content.="&下页
";
      return $echo_content;

   }
}

/*例子
//browser("表名",每页显示的数目,"sql","查询条件","排序条件");
$gggg=new browser("news",5,"select auto_id,news_title from news","","order by newstime desc");

$temp=$gggg->ShowTable();
echo $temp;

//$gggg->GetFound()是将查询结果集存在一个二维数组里,本例中没有用到。
*/
?>
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