pdo类，分页类

<?php
//数据库连接类
class ConnDB{
	
	var $dbtype;
	var $host;
    var $user;
    var $pwd;
    var $dbname;
    
	//构造方法
    function ConnDB($dbtype,$host,$user,$pwd,$dbname){
		$this->dbtype=$dbtype;
    	$this->host=$host;
		$this->user=$user;
		$this->pwd=$pwd;
		$this->dbname=$dbname;
	}

    //实现数据库的连接并返回连接对象
    function GetConnId(){
     	
    	if($this->dbtype=="mysql" || $this->dbtype=="mssql"){
    		$dsn="$this->dbtype:host=$this->host;dbname=$this->dbname";
		}else{
			$dsn="$this->dbtype:dbname=$this->dbname";
		}    
		try {
    		$conn = new PDO($dsn, $this->user, $this->pwd); 	//初始化一个PDO对象，就是创建了数据库连接对象$pdo
			$conn->query("set names utf8");
    		return $conn;
		} catch (PDOException $e) {
    		die ("Error!: " . $e->getMessage() . "<br/>");
		}

     	
    }	
}

//数据库管理类
class AdminDB{
	
	
	function ExecSQL($sqlstr,$conn){
		
		$sqltype=strtolower(substr(trim($sqlstr),0,6));
		$rs=$conn->prepare($sqlstr);		//准备查询语句
		$rs->execute();					//执行查询语句，并返回结果集
		if($sqltype=="select"){
			$array=$rs->fetchAll(PDO::FETCH_ASSOC);		//获取结果集中的所有数据
			if(count($array)==0 || $rs==false)
				return false;
			else
				return $array;
		}elseif ($sqltype=="update" || $sqltype=="insert" || $sqltype=="delete"){			
			if($rs)
			    return true;
			else 
			    return false;    
		}
	}
}
//分页类
class SepPage{
	var $rs;
	var $pagesize;
	var $nowpage;
	var $array;
	var $conn;
	var $sqlstr;
	function ShowData($sqlstr,$conn,$pagesize,$nowpage){	//定义方法
		if(!isset($nowpage) || $nowpage=="")			//判断变量值是否为空
			$this->nowpage=1;						//定义每页起始页
		else
			$this->nowpage=$nowpage;
		$this->pagesize=$pagesize;					//定义每页输出的记录数
		$this->conn=$conn;							//连接数据库返回的标识
		$this->sqlstr=$sqlstr;							//执行的查询语句
		$offset=($this->nowpage-1)*$this->pagesize;
		$sql=$this->sqlstr." limit $offset, $this->pagesize";
		$result=$this->conn->prepare($sql);			//准备查询语句
		$result->execute();						//执行查询语句，并返回结果集
		$this->array=$result->fetchAll(PDO::FETCH_ASSOC);		//获取结果集中的所有数据
		if(count($this->array)==0 || $this->array==false)
			return false;
		else
			return $this->array;
	}
	
	function ShowPage($contentname,$utits,$anothersearchstr,$anothersearchstrs,$class){
		$str="";
		$res=$this->conn->prepare($this->sqlstr);			//准备查询语句
		$res->execute();						//执行查询语句，并返回结果集
		$this->array=$res->fetchAll(PDO::FETCH_ASSOC);		//获取结果集中的所有数据	
		$record=count($this->array);				//统计记录总数
		
		$pagecount=ceil($record/$this->pagesize);		//计算共有几页
		$str.=$contentname." ".$record." ".$utits." 每页 ".$this->pagesize." ".$utits." 第 ".$this->nowpage." 页/共 ".$pagecount." 页";
		$str.="    ";
		if($this->nowpage!=1)
			$str.="<a href=".$_SERVER['PHP_SELF']."?page=1&page_type=".$anothersearchstr."¶meter2=".$anothersearchstrs." class=".$class.">首页</a>";
		else
			$str.="<font color='#555555'>首页</font>";
		$str.=" ";
		if($this->nowpage!=1)
			$str.="<a href=".$_SERVER['PHP_SELF']."?page=".($this->nowpage-1)."&page_type=".$anothersearchstr."¶meter2=".$anothersearchstrs." class=".$class.">上一页</a>";
		else
			$str.="<font color='#555555'>上一页</font>";
		$str.=" ";	
		if($this->nowpage!=$pagecount)
			$str.="<a href=".$_SERVER['PHP_SELF']."?page=".($this->nowpage+1)."&page_type=".$anothersearchstr."¶meter2=".$anothersearchstrs." class=".$class.">下一页</a>";
		else
			$str.="<font color='#555555'>下一页</font>";	
		$str.=" ";
		if($this->nowpage!=$pagecount)
			$str.="<a href=".$_SERVER['PHP_SELF']."?page=".$pagecount."&page_type=".$anothersearchstr."¶meter2=".$anothersearchstrs." class=".$class.">尾页</a>";
		else
			$str.="<font color='#555555'>尾页</font>";
		if(count($this->array)==0 || $this->array==false)			
			return "无数据！";
		else
		    return $str;	
	}
}
//系统常用方法
class UseFun{
	
	function UnHtml($text){
	   $content=(nl2br(htmlspecialchars($text)));
	   $content=str_replace("[strong]","<strong>",$content);
	   $content=str_replace("[/strong]","</strong>",$content);
	   $content=str_replace("[em]","<em>",$content);
	   $content=str_replace("[/em]","</em>",$content);
	   $content=str_replace("[u]","<u>",$content);
	   $content=str_replace("[/u]","</u>",$content);
	
	
	   $content=str_replace("[font color=#FF0000]","<font color=#FF0000>",$content);
	   $content=str_replace("[font color=#00FF00]","<font color=#00FF00>",$content);
	   $content=str_replace("[font color=#0000FF]","<font color=#0000FF>",$content);
	
	   $content=str_replace("[font face=楷体_GB2312]","<font face=楷体_GB2312>",$content);
	   $content=str_replace("[font face=宋体]","<font face=新宋体>",$content);
	   $content=str_replace("[font face=隶书]","<font face=隶书>",$content);
       $content=str_replace("[/font]","</font>",$content);
	   //$content=str_replace(chr(32)," ",$content);
	   $content=str_replace("[font size=1]","<font size=1>",$content);
	   $content=str_replace("[font size=2]","<font size=2>",$content);
	   $content=str_replace("[font size=3]","<font size=3>",$content);
	   $content=str_replace("[font size=4]","<font size=4>",$content);
       $content=str_replace("[font size=5]","<font size=5>",$content);
	   $content=str_replace("[font size=6]","<font size=6>",$content);
	   
	   $content=str_replace("[FIELDSET][LEGEND]","<FIELDSET><LEGEND>",$content);
	   $content=str_replace("[/LEGEND]","</LEGEND>",$content);
	   $content=str_replace("[/FIELDSET]","</FIELDSET>",$content);
	   return $content;
	}
	
}

?>