站长资源网络编程

复制代码 代码如下:
<?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;
        }
    }
?>

复制代码 代码如下:
<?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。