本文操作环境:windows7系统、PHP7.1版、Dell G3电脑。
php 分页查询怎么写?php实现分页功能的3种方法
直接上代码,希望大家仔细阅读。
方法一:sql查询进行分页,需要调用几个函数,具体见脚本:
1.pager.class.php
<?php class pager { public $sql; //SQL查询语句 public $datanum; //查询所有的数据总记录数 public $page_size; //每页显示记录的条数 protected $_errstr; protected $_conn; protected $_query_id; public function query($query)///这个函数有问题,暂时可以不用 { $ret = false; if (!empty($query)) { if ($this->_conn === false || !is_resource($this->_conn)) { warningLog(__METHOD__ . ': query sql with no connection', true); return false; } $this->_query_id = @mysql_query($query, $this->_conn); if ($this->_query_id === false) { $this->_errstr = @mysql_error(); $ret = false; } else { $this->_errstr = 'SUCCESS'; $ret = $this->_query_id; } } $msg = ($ret === false) ? 'false' : strval($ret); debugLog(__METHOD__.": [$msg] returned for sql query [$query]"); return $ret; } function __construct($sql,$page_size) { $result = mysql_query($sql); $datanum = mysql_num_rows($result); $this->sql=$sql; $this->datanum=$datanum; $this->page_size=$page_size; } //当前页数 public function page_id() { if($_SERVER['QUERY_STRING'] == ""){ return 1; }elseif(substr_count($_SERVER['QUERY_STRING'],"page_id=") == 0){ return 1; }else{ return intval(substr($_SERVER['QUERY_STRING'],8)); } } //剩余url值 public function url() { if($_SERVER['QUERY_STRING'] == ""){ return ""; }elseif(substr_count($_SERVER['QUERY_STRING'],"page_id=") == 0){ return "&".$_SERVER['QUERY_STRING']; }else{ return str_replace("page_id=".$this->page_id(),"",$_SERVER['QUERY_STRING']); } } //总页数 public function page_num() { if($this->datanum == 0){ return 1; }else{ return ceil($this->datanum/$this->page_size); } } //数据库查询的偏移量 public function start() { return ($this->page_id()-1)*$this->page_size; } //数据输出 public function sqlquery() { return $this->sql." limit ".$this->start().",".$this->page_size; } //获取当前文件名 private function php_self() { return $_SERVER['PHP_SELF']; } //上一页 private function pre_page() { if ($this->page_id() == 1) { //页数等于1 return "<a href=".$this->php_self()."?page_id=1".$this->url().">上一页</a> "; }elseif ($this->page_id() != 1) { //页数不等于1 return "<a href=".$this->php_self()."?page_id=".($this->page_id()-1).$this->url().">上一页</a> "; } } //显示分页 private function display_page() { $display_page = ""; if($this->page_num() <= 10){ //小于10页 for ($i=1;$i<=$this->page_num();$i++) //循环显示出页面 $display_page .= "<a href=".$this->php_self()."?page_id=".$i.$this->url().">".$i."</a> "; return $display_page; }elseif($this->page_num() > 10){ //大于10页 if($this->page_id() <= 6){ for ($i=1;$i<=10;$i++) //循环显示出页面 $display_page .= "<a href=".$this->php_self()."?page_id=".$i.$this->url().">".$i."</a> "; return $display_page; }elseif(($this->page_id() > 6) && ($this->page_num()-$this->page_id() >= 4)){ for ($i=$this->page_id()-5;$i<=$this->page_id()+4;$i++) //循环显示出页面 $display_page .= "<a href=".$this->php_self()."?page_id=".$i.$this->url().">".$i."</a> "; return $display_page; }elseif(($this->page_id() > 6) && ($this->page_num()-$this->page_id() < 4)){ for ($i=$this->page_num()-9;$i<=$this->page_num();$i++) //循环显示出页面 $display_page .= "<a href=".$this->php_self()."?page_id=".$i.$this->url().">".$i."</a> "; return $display_page; } } } //下一页 private function next_page() { if ($this->page_id() < $this->page_num()) { //页数小于总页数 return "<a href=".$this->php_self()."?page_id=".($this->page_id()+1).$this->url().">下一页</a> "; }elseif ($this->page_id() == $this->page_num()) { //页数等于总页数 return "<a href=".$this->php_self()."?page_id=".$this->page_num().$this->url().">下一页</a> "; } } // 设置分页信息 public function set_page_info() { $page_info = "共".$this->datanum."条 "; $page_info .= "<a href=".$this->php_self()."?page_id=1".$this->url().">首页</a> "; $page_info .= $this->pre_page(); $page_info .= $this->display_page(); $page_info .= $this->next_page(); $page_info .= "<a href=".$this->php_self()."?page_id=".$this->page_num().$this->url().">尾页</a> "; $page_info .= "第".$this->page_id()."/".$this->page_num()."页"; return $page_info; } } ?>
2.脚本2:
<?php //类的用法 // 读取分页类 include("pager.class.php"); // 数据库连接初始化 // $db = new mysql(); $impeach_host = '10.81.43.139'; $impeach_usr = 'vmtest15'; $impeach_passwd = 'vmtest15'; $impeach_name = 'ufeature'; $impeach_con = mysql_connect($impeach_host, $impeach_usr, $impeach_passwd) or die("Can't connect ".mysql_error()); mysql_select_db($impeach_name, $impeach_con); // 这是一个sql查询语句,并得到查询结果 $sql = "select word from ufeature.spam_accuse_word_list where flag='0'"; // 分页初始化 $page = new pager($sql,20); // 20是每页显示的数量 // $res_1 = mysql_query($sql) or // die("Can't get result ".mysql_error()); $result=mysql_query($page->sqlquery()); while($info = mysql_fetch_array($result,MYSQL_ASSOC)){ // while($info = mysql_fetch_array($res_1, MYSQL_ASSOC)){ echo $info["word"]."<br/>"; } // 页码索引条 echo $page->set_page_info(); ?>
方法二:使用ajax的方法
1、首先了解SQL语句中的limit用法
SELECT * FROM table …… limit 开始位置 , 操作条数 (其中开始位置是从0开始的)
例子
取前20条记录:SELECT * FROM table …… limit 0 , 20
从第11条开始取20条记录:SELECT * FROM table …… limit 10 , 20
LIMIT n 等价于 LIMIT 0,n。
如select * from table LIMIT 5; //返回前5行,和select * from table LIMIT 0,5一样
2、分页原理
所谓分页显示,也就是讲数据库中的结果集,一段一段显示出来
怎么分段,当前在第几段 (每页有几条,当前再第几页)
前10条记录:select * from table limit 0,10
第11至20条记录:select * from table limit 10,10
第21至30条记录:select * from table limit 20,10
分页公式:
(当前页数 - 1 )X 每页条数 , 每页条数
Select * from table limit ($Page- 1) * $PageSize, $PageSize
3、$_SERVER["REQUEST_URI"]函数
预定义服务器变量的一种,所有$_SERVER开头的都叫做预定于服务器变量。
REQUEST_URI的作用是取得当前URI,也就除域名外后面的完整的地址路径。
例子:
当前页为:http://www.test.com/home.php?id=23&cid=22
echo $_SERVER["REQUEST_URI"]
结果为:/home.php?id=23&cid=22
4、parse_url()解析URL函数
parse_url() 是讲URL解析成有固定键值的数组的函数
例子
$ua=parse_url("http://username:password@hostname/path?arg=value#anchor"); print_r($ua);
结果:
Array ( [scheme] => http ;协议 [host] => hostname ;主机域名 [user] => username ;用户 [pass] => password ;密码 [path] => /path ;路径 [query] => arg=value ;取参数 [fragment] => anchor ; )
5、代码实例
这个一个留言的分页,分为3个部分,一个是数据库设计,一个是连接页面,一个是显示页面。
(1)设计数据库
设计数据库名为bbs,有一个数据表为message,里面包含title,lastdate,user,content等字段,分别表示留言标题,留言日前,留言人,留言的内容
(2)连接页面
<?php $conn = @ mysql_connect("localhost", "root", "123456") or die("数据库链接错误"); mysql_select_db("bbs", $conn); mysql_query("set names 'GBK'"); //使用GBK中文编码; //将空格,换行转换为HTML可解析 function htmtocode($content) { $content = str_replace("\n", "<br>", str_replace(" ", " ", $content)); //两个str_replace嵌套 return $content; } //$content=str_replace("'","‘",$content); //htmlspecialchars(); ?>
(3)显示页面
<?php include("conn.php"); $pagesize=2; //设置每页显示2个记录 $url=$_SERVER["REQUEST_URI"]; $url=parse_url($url); $url=$url[path]; $numq=mysql_query("SELECT * FROM `message`"); $num = mysql_num_rows($numq); if($_GET){ $pageval=$_GET; $page=($pageval-1)*$pagesize; $page.=','; } if($num > $pagesize){ if($pageval<=1)$pageval=1; echo "共 $num 条". " <a href=$url?page=".($pageval-1).">上一页</a> <a href=$url?page=".($pageval+1).">下一页</a>"; } $SQL="SELECT * FROM `message` limit $page $pagesize "; $query=mysql_query($SQL); while($row=mysql_fetch_array($query)){ ?> <table width=500 border="0" cellpadding="5" cellspacing="1" bgcolor="#add3ef"> <tr bgcolor="#eff3ff"> <td>标题:<?php echo $row[title]?></td> <td>时间:<?php echo $row[lastdate]?></td> </tr> <tr bgcolor="#eff3ff"> <td> 用户:<?php echo $row[user]?></td><td></td> </tr> <tr> <td>内容:<?php echo htmtocode($row[content]);?></td> </tr> <br> </table> <?php } ?>
方法3:
<script> function viewpage(p){ if(window.XMLHttpRequest){ var xmlReq = new XMLHttpRequest(); } else if(window.ActiveXObject) { var xmlReq = new ActiveXObject('Microsoft.XMLHTTP'); } var formData = "page="+p; xmlReq.onreadystatechange = function(){ if(xmlReq.readyState == 4){ document.getElementByIdx_x('content2').innerHTML = xmlReq.responseText; } } xmlReq.open("post", "hotel_list.php", true); xmlReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); xmlReq.send(formData); return false; } </script>
脚本2:
header("Content-Type:text/html;charset=GB2312"); $pagesize=10; //echo $_POST['page']; $result = mysql_query("Select count(DISTINCT hotelname) FROM ".TBL_HOTELS); $myrow = mysql_fetch_array($result); $numrows=$myrow[0]; $pages=intval($numrows/$pagesize); if ($numrows%$pagesize) $pages++; if (isset($_POST['page'])){ $page=intval($_POST['page']); } else{ //设置为第一页 $page=1; } $first=1; $prev=$page-1; $next=$page+1; $last=$pages; //计算记录偏移量 $offset=$pagesize*($page - 1); //读取指定记录数 $result=mysql_query("select `hotelname` , count( * ) from ".TBL_HOTELS." GROUP BY `hotelname` order by id desc limit $offset,$pagesize"); $num = mysql_num_rows($result); while ($row = mysql_fetch_array($result,MYSQL_NUM)) { $hotelname[] = $row[0]; $countpeople[] = $row[1]; } for($a=0;$a<$num;$a++) { //$result=mysql_query("select count(title) from " . TBL_Comments ." where `title`=\"".$title[$a]."\""); //$row = mysql_fetch_row($result); echo "<TABLE style=\"MARGIN-BOTTOM: 20px\" cellSpacing=0 cellPadding=0 width=100% border=0>\n"; echo "<TBODY>\n"; echo "<TR>\n"; echo "<TD style=\"PADDING-TOP: 5px\" vAlign=top align=left width=80>\n"; //rating_bar($title[$a],5); echo "</TD>\n"; echo "<TD style=\"PADDING-TOP: 5px\" align=left width=100%><A title=$hotelname[$a] style=\"FONT-SIZE: 14px\" href=#>$hotelname[$a]</A>\n"; echo "</TD></TR>\n"; echo " <TR>\n"; echo "<TD></TD>\n"; echo "<TD style=\"PADDING-LEFT: 0px\">\n"; echo "<IMG src=\"images/comment.gif\" border=0> 推荐人数:($countpeople[$a]) |\n"; echo "<SPAN>平均分:<STRONG></STRONG> (".$count."票) | 评论数:()</SPAN>\n"; echo "</TD></TR></TBODY></TABLE>\n"; } echo "<TABLE style=\"MARGIN-TOP: 30px\" cellSpacing=0 cellPadding=0 width=\"100%\""; echo "border=0>"; echo "<TBODY><TR><TD colSpan=3 height=20>"; echo "<DIV align=center>"; echo "<P align=left><FONT color=red>第".$page."页/总".$pages."页 | 总".$numrows."条</FONT> | "; if ($page>1) echo "<a onclick=\"viewpage(".$first.")\" href='#'>首页</a> | "; if ($page>1) echo "<a onclick=\"viewpage(".$prev.")\" href='#'>上页</a> | "; if ($page<$pages) echo "<a onclick=\"viewpage(".$next.")\" href='#'>下页</a> | "; if ($page<$pages) echo "<a onclick=\"viewpage(".$last.")\" href='#'>尾页</a>"; echo "转到第 <INPUT maxLength=3 size=3 value=1 name=goto_page> 页 <INPUT hideFocus onclick=\"viewpage(document.all.goto_page.value)\" type=button value=Go name=cmd_goto>"; echo "</P></DIV></TD></TR></TBODY></TABLE>";
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