PHP操作MSSql

<?php
 if (!defined('BASEPATH')) exit('No direct script access allowed'); 
    /*****PHP操作SqlServer数据库********/
    class  Sqlsrv
    {
        private $hostname="JKT-001SQLEXPRESS";
        private $username="sa";
        private $password="52ebook";
        private $dbname="enterprise";
        private $conn;
        function __construct()
            {
                try{
                $constr=array("Database"=>$this->dbname,"CharacterSet" => "UTF-8","UID"=>$this->username,"PWD"=>$this->password);
                
                $this->conn=sqlsrv_connect($this->hostname,$constr);
                
                if($this->conn==false)
                {
                    print_r(sqlsrv_errors(),true);
                    die;
                }
                
                }catch(Exception $ex)
                {
                    echo $ex->getMessage();
                }
            }
        /*查询所有数据*/
        public function QuaryAll($sql)
        {
            try{
            $rs=sqlsrv_query($this->conn,$sql);
            $result=array();
            while($row = sqlsrv_fetch_array($rs,SQLSRV_FETCH_NUMERIC))
            {
                $result[]=$row;
            }
            sqlsrv_free_stmt($rs);
            return $result;
            }catch(Exception $ex)
            {
                echo $ex->getMessage();
            }
        }
        /*执行sql语句，返回所影响的行数*/
        public function AffectedRows($sql)
        {
            try{
            $rs=sqlsrv_query($this->conn,$sql);
            $result=sqlsrv_rows_affected($rs);
            sqlsrv_free_stmt($rs);
            return $result;
            }catch(Exception $ex)
            {
                echo $ex->getMessage();
            }
        }
        
        /**
        实现分页查询*
        *@tablename 表名
        *@columns    字段列表
        *@pagenum    当前页码
        *@pagecount    页面条数
        *@prikey    分页主键
        *@orderkey    排序主键
        */
        public function QueryPage($tablename,$columns='*',$pagenum=20,$pagecount=1,$prikey,$orderkey)
        {
            try{
            $columnnames='*';
            if(is_array($columns))
            {
                $columnnames=implode(',',$columns);
            }
            $sql='select top '.$pagenum.' '.$columnnames.' from '.$tablename.' where '.$prikey.' not in (select top '.$pagenum*($pagecount-1).' '.$prikey.' from '.$tablename.' order by '.$orderkey.') order by '.$orderkey;
            $rs=sqlsrv_query($this->conn,$sql);
            $result=array();
            while($row = sqlsrv_fetch_array($rs,SQLSRV_FETCH_NUMERIC))
            {
                $result[]=$row;
            }
            sqlsrv_free_stmt($rs);
            return $result;
            }catch(Exception $ex)
            {
                echo $ex->getMessage();
            }
        }
        function __destruct()
        {
            sqlsrv_close($this->conn);
        }
    }