php mysql数据库操作分页类

<?php 
/* 
 *    mysql数据库 分页类 
 *    @package    pagelist 
 *    @author        yytcpt(无影) 
 *    @version    2008-03-27 
 *    @copyrigth    http://www.d5s.cn/  
 */ 
/* 
 *    分页样式 
    .page{float: left;font: 11px Arial, Helvetica, sans-serif; padding:6px 0; margin: 0px 10%; margin-top: 10px;} 
    .page a, .page strong{padding: 2px 6px; border: solid 1px #ddd;    background: #fff; text-decoration: none;} 
    .page a:visited{padding: 2px 6px; border: solid 1px #ddd; background: #fff; text-decoration: none;} 
    .page .break{padding: 2px 6px; border: none; background: #fff; text-decoration: none;} 
    .page strong{padding: 2px 6px; border-color: #999; font-weight: bold; font-size: 13px; vertical-align: top; background: #fff;} 
    .page a:hover{color: #fff; background: #0063DC; border-color: #036; text-decoration: none;} 
    .page a:hover div{color: #FFF;cursor: pointer !important;cursor: hand;} 
*/ 
    class pagelist{ 
        var $page;            //分页页码 
        var $sql;            //分页sql 
        var $img_path;        //图标路径 
        var $img;            //图标名称 
        var $img_btn;        //图标地址 
        var $page_size;        //设置每页显示条数 
        var $num_btn;        //设置数字分页的显示个数 
        var $total_pages;    //一共分多少页 
        var $total_records;    //一共有多少条记录 
        var $url; 
        var $table; 
        var $new_sql;        //指定的SQL语句 
        var $db; 
        function __construct(){ 
            global $db; 
            $this->db = $db; 
            $tmp_page = intval(trim($_GET["page"])); 
            $this->page = empty($tmp_page)?1:$tmp_page; 
            $this->set_table(); 
            $this->page_size = 20; 
            $this->num_btn    = 9; 
            $this->img_path    = '/images/'; 
            $this->img        = array("ico_first.gif", "ico_front.gif", "ico_next.gif", "ico_last.gif"); 
        } 
        function set_table(){ 
            $this->table["tablename"]    = ""; 
            $this->table["id"]        = "id"; 
            $this->table["orderby"]    = $this->table["id"]; 
            $this->table["descasc"]    = "DESC"; 
            $this->table["fileds"]    = "*"; 
            $this->table["where"]    = ""; 
        } 
        function set_img(){ 
            $this->img_btn[0]    = "<img src='".$this->img_path.$this->img[0]."' alt='首页' border='0' align='absmiddle'/>"; 
            $this->img_btn[1]    = "<img src='".$this->img_path.$this->img[1]."' alt='上一页' border='0' align='absmiddle'/>"; 
            $this->img_btn[2]    = "<img src='".$this->img_path.$this->img[2]."' alt='下一页' border='0' align='absmiddle'/>"; 
            $this->img_btn[3]    = "<img src='".$this->img_path.$this->img[3]."' alt='末页' border='0' align='absmiddle'/>"; 
        } 
        function set_show_page(){ 
            $this->set_img();        //设置翻页图片路径 
            $this->set_url(); 
            $this->set_total_records(); 
            if ($this->total_records<$this->page_size){ 
                $this->total_pages = 1; 
            }else{ 
                $this->total_pages = ceil($this->total_records/$this->page_size); 
            } 
            if ($this->page>$this->total_pages){ 
                $this->page = $this->total_pages; 
            } 
        } 
        function show_first_prv(){ 
            if ($this->page==1){ 
                $str = "<strong>".$this->img_btn[0]."</strong> <strong>".$this->img_btn[1]."</strong>"; 
            }else{ 
                $str = "<a href='".$this->url."1"."'>".$this->img_btn[0]."</a> ";    //此处1为首页，page值为1 
                $str.= "<a href='".$this->url.($this->page-1)."'>".$this->img_btn[1]."</a>"; 
            } 
            return $str; 
        } 
        function show_next_last(){ 
            if ($this->page>=$this->total_pages){ 
                $str =  "<strong>".$this->img_btn[2]."</strong> <strong>".$this->img_btn[3]."</strong>"; 
            }else{ 
                $str = "<a href='".$this->url.($this->page+1)."'>".$this->img_btn[2]."</a> "; 
                $str.= "<a href='".$this->url.$this->total_pages."'>".$this->img_btn[3]."</a>"; 
            } 
            return $str; 
        } 
        function show_num_text(){ 
            $str = " 转到第 <input id='go_num_text' type='text' value='".$this->page."' style='border:0;border-bottom:1px solid #CCC;text-align:center;width:20px;'/> 页 "; 
            $str.= "<a href='#' onClick=\"window.location='".$this->url."'+document.getElementById('go_num_text').value;\" style='font-family: Arial, Helvetica, sans-serif;font-weight:bold;font-size:14px;'>[Go]</a>"; 
            return $str; 
        } 
        function show_num_select(){ 
            if ($this->total_pages<50){ 
                $str = "<select onchange=\"if(this.options[this.selectedIndex].value!=''){location=this.options[this.selectedIndex].value;}\">"; 
                for ($i=1; $i<=$this->total_pages; $i++){ 
                    $str.= "<option value='".$this->url.$i."' ".($this->page==$i ? " selected='selected'":"").">".$i."</option>"; 
                } 
                $str.= "</select> "; 
            }else{ 
                $str = ""; 
            } 
            return $str; 
        } 
        function show_num_btn(){ 
            if ($this->page>=1 and $this->page<=$this->total_pages){ 
                $tmp_p    = ($this->num_btn-1)/2; 
                if (($this->page - $tmp_p)<=0){ 
                    $start_p    = 1; 
                }else{ 
                    if (($this->page-$tmp_p)>$this->num_btn and ($this->page-$tmp_p)>($this->total_pages - $this->num_btn+1)){ 
                        $start_p    = $this->total_pages - $this->num_btn + 1; 
                    }else{ 
                        $start_p    = $this->page - $tmp_p; 
                    } 
                } 
                if (($this->page+$tmp_p) < $this->total_pages){ 
                    $end_p = ($this->page + $tmp_p)<$this->num_btn?$this->num_btn:($this->page + $tmp_p); 
                    if ($end_p>$this->total_pages){ 
                        $end_p = $this->total_pages; 
                    } 
                }else{ 
                    $end_p = $this->total_pages; 
                } 
            } 
            $str = ""; 
            for ($i=$start_p; $i<=$end_p; $i++){ 
                if ($i==$this->page){ 
                    $str.= " <strong>".$i."</strong> "; 
                }else{ 
                    $str.= " <a href='".$this->url.$i."'>".$i."</a> "; 
                } 
            } 
            return $str; 
        } 
        function show_page_info(){ 
            $str = " 共".$this->total_records."条/".$this->total_pages."页"; 
            return $str; 
        } 
        function show_page(){ 
            if ($this->total_records<1){ 
                $this->set_show_page(); 
            } 
            $str = $this->total_pages>1 ? $this->show_first_prv().$this->show_num_btn().$this->show_next_last().$this->show_page_info().$this->show_num_text():""; 
            return $str; 
        } 
        //总页数 
        function set_total_pages(){ 
            $this->total_pages = ceil($this->total_records/$this->page_size); 
        } 
        //总记录数 
        function set_total_records(){ 
            if ($this->total_records==0 or !isset($this->total_records)){ 
                if (empty($this->count_sql) and !empty($this->table["tablename"])){ 
                    $sql = "SELECT count(".$this->table["id"].") as count_id FROM `".$this->table["tablename"]."` ".($this->table["where"]!=""?" WHERE ".$this->table["where"]:""); 
                }else{ 
                    $sql = preg_replace("/SELECT(.*?)FROM(.*?)/i", "SELECT count(id) AS count_id FROM\\2", $this->sql); 
                } 
                $arr = $this->db->row_query_one($sql); 
                $this->total_records = $arr["count_id"]; 
            } 
        } 
        /* 
         * 根据sql返回查询数据 
         * 指定$sql时，不必指定limit 
         */ 
        function get_rows_by_sql($sql){ 
            $this->sql = $sql." LIMIT ".$this->page_size*($this->page-1).", ".$this->page_size;    //指定的SQL; 
            return $this->db->row_query($this->sql); 
        } 
        /* 
         * 最常用的分页方法，只需要传3个参数 
         * $tablename 表名， $where 查询条件， $orderby 排序字段（默认以id倒序排列） 
         */ 
        function get_rows($tablename, $where="", $orderby=""){ 
            $this->table["tablename"]    = $tablename; 
            $this->table["where"]        = $where; 
            $orderby ? $this->table["orderby"] = $orderby : ""; 
            $arr = array( 
                "page"    => $this->show_page(),            //分页代码 
                "rows"    => $this->get_rows_by_sql(),    //记录数 
                "sum"    => $this->total_records,        //总记录数 
            ); 
            return $arr; 
        } 
        /* 
         * 特殊查询，$sql_query 查询sql语句, $row_count 统计总数 
         */ 
        function get_rows_sql($sql_query, $row_count=0) { 
            $this->total_records = $row_count; 
            $arr["rows"]    = $this->get_rows_by_sql($sql_query); 
            $arr["page"]    = $this->show_page(); 
            $arr["sum"]        = $this->total_records; 
            return $arr; 
        } 
        function get_sql(){ 
            if ($this->total_records>10000) { 
                $this->sql = "SELECT ".$this->table["fileds"]." FROM `".$this->table["tablename"]."` ".($this->table["where"]!=""?" WHERE ".$this->table["where"].' AND '.$this->table["id"].'>=':' WHERE '.$this->table["id"].'>=').'(SELECT '.$this->table["id"].' FROM `'.$this->table["tablename"].'` ORDER BY '.$this->table["id"].' LIMIT '.$this->page_size*($this->page-1).', 1)'." ORDER BY ".$this->table["orderby"]." ".$this->table["descasc"]." LIMIT ".$this->page_size; 
            }else{ 
                $this->sql = "SELECT ".$this->table["fileds"]." FROM `".$this->table["tablename"]."` ".($this->table["where"]!=""?" WHERE ".$this->table["where"]:"")." ORDER BY ".$this->table["orderby"]." ".$this->table["descasc"]." LIMIT ".$this->page_size*($this->page-1).", ".$this->page_size; 
            } 
            //SELECT * FROM articles ORDER BY id DESC LIMIT 0, 20 
            //SELECT * FROM articles WHERE category_id = 123 AND id >= (SELECT id FROM articles ORDER BY id LIMIT 10000, 1) LIMIT 10 
            return $this->sql;        //SQL语句 
        } 
        function set_url(){ 
            $arr_url = array(); 
            parse_str($_SERVER["QUERY_STRING"], $arr_url); 
            unset($arr_url["page"]); 
            if (empty($arr_url)){ 
                $str = "page="; 
            }else{ 
                $str = http_build_query($arr_url)."&page="; 
            } 
            $this->url = "http://".$_SERVER["HTTP_HOST"].$_SERVER["PHP_SELF"]."?".$str; 
        } 
    } 
?>

<?php  
    $db_config["hostname"]    = "127.0.0.1";    //服务器地址  
    $db_config["username"]    = "root";        //数据库用户名  
    $db_config["password"]    = "root";        //数据库密码  
    $db_config["database"]    = "wap_blueidea_com";        //数据库名称  
    $db_config["charset"]    = "utf8";  
    $config["charset"]        = "utf-8";        //网站编码      include('db.php');  
    include('pagelist.php');  
    $db    = new db();  
    $db->connect($db_config);  
    header("content-type:text/html;charset=".$config["charset"]);//设置页面编码  
    $pl = new pagelist();  
    $arr = $pl->get_rows('table_name');  
    unset($pl);  
    echo '<pre style="text-align:left">';  
    print_r($arr);  
    echo '</pre>';  
    //指定特殊 sql 时候  
    $pl = new pagelist();  
    $sql = 'SELECT * FROM `wap_article` AS a, `wap_article_info` AS b WHERE a.id=b.articleid';  
    $arr = $pl->get_rows_sql($sql);  
    unset($pl);  
    echo '<pre style="text-align:left">';  
    print_r($arr);  
    echo '</pre>';  
?> 

当表中的记录总数在 10000条以上时，使用了 子查询分页，这样效率会更高一些，数据量小的时候，直接查询更快。