php数据库改分页类 php mysql 分页

在php中如何对多条记录进行分页方法一:讲sql查询进行分页进行,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="https://www.04ip.com/post/.$this-php_self()."?page_id=1".$this-url()."上一页/a ";
}elseif ($this-page_id() != 1) { //页数不等于1
return "a href="https://www.04ip.com/post/.$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
$display_page .= "a href="https://www.04ip.com/post/.$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
$display_page .= "a href="https://www.04ip.com/post/.$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
$display_page .= "a href="https://www.04ip.com/post/.$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
$display_page .= "a href="https://www.04ip.com/post/.$this-php_self()."?page_id=".$i.$this-url()."".$i."/a ";

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