<?php
/*
* PHP操作MSSQL类
* ----------------------------------------------------------------------------
* Created on 2011-11-19 by aklee
*
*/
 
  class Orm_Mssql{
      private $db_IP;                  //数据库IP
      private $db_user;                 //数据库用户
      private $db_sa;                     //数据库SA密码
      private $db_dbName;                //数据库名
      private $conn;                          //连接标识 'conn' 及 'pconn''
      private $result;                          //Query命令结果标识
      private $sql;                                //SQL语句
      private $row;                                //返回条目数

      /* 构造函数 */
    public function __construct($db_host,$db_user,$db_sa,$db_dbName,$conn)
    {
         $this->db_host=$db_host;
         $this->db_user=$db_user;
         $this->db_sa = $db_sa;
         $this->db_dbName=$db_dbName;
         $this->conn=$conn;
         $this->connect();
    }
 
    /* 数据库连接 */
    public function connect()
    {
        if($this->conn=="pconn"){  //永久链接

            $this->conn=mssql_pconnect($this->db_host,$this->db_user,$this->db_sa);

        }else{                            //即时链接

                $this->conn=mssql_connect($this->db_host,$this->db_user,$this->db_sa);

        }

        if(!mssql_select_db($this->db_dbName,$this->conn)){
                        die("SQL ERROR:".$this->db_dbName);
        }
    }

    /* 增|删|改|查 */
    public function query($sql)
    {
        if($sql == ""){

        die("SQL ERROR:SQL IS NULL!");}
        $this->sql = $sql;

        $result = mssql_query($this->sql,$this->conn);

            if(!$result){  //调试用，sql语句出错时会自动打印出来

              die("SQL：".$this->sql);

            }else{

                    $this->result = $result;

            }

        return $this->result;

    }

    //创建一个新数据库
    public function create_database($database_name){
            $database=$database_name;
            $sqlDatabase = 'create database '.$database;
            $this->query($sqlDatabase);
    }

    //获取记录集
    public function fetch_array()
    {
      $back = array(); 
      while ($res = mssql_fetch_array($this->result)) { 
        $back[] = $res; 
      } 
            return $back;
    }
    // function result_ar($str=''){ 
    //   if (empty($str)) { 
    //     return 0; 
    //   } 
    //   $back = array(); 
    //   $this->queryResult = $this->query($str); 
       
    //   while ($row = $this->fetch_array($this->queryResult)) { 
    //     $back[] = $row; 
    //   } 
    //   return $back; 
    // } 
    //获取关联数组
    public function fetch_assoc()
    {
            return mssql_fetch_assoc($this->result);
    }

    //获取数字索引数组
    public function fetch_row()
    {
            return mssql_fetch_row($this->result);
    }

      //获取对象数组 调试:‘$row->content’
      public function fetch_Object()
    {
            return mssql_fetch_object($this->result);
    }

    //指向确定的一条数据记录
    public function db_data_seek($id){
            if($id>0){
                    $id=$id-1;
            }
            if(!@mssql_data_seek($this->result,$id)){
                    die('SQL ERROR:Specified data is null!');
            }
            return $this->result;
    }

    //根据查询结果集条目
    public function db_num_rows(){
             if($this->result==null){
                             die('SQL ERROR:Being empty, nothing!');
             }else{
                     return  mssql_num_rows($this->result);
             }
    }

    //返回最后一次写入查询影响的记录数
    public function db_affected_rows(){
             return mssql_rows_affected();
    }

    //释放结果集
    public function free(){
            @mssql_free_result($this->result);
    }

    //数据库选择
    public function select_db($db_database){
            return mssql_select_db($db_database);
    }

    //获取结果的字段数
    public function num_fields($table_name){
            $this->query("select * from $table_name");
            echo $total = mssql_num_fields($this->result);
            echo "<pre>";
            for ($i=0; $i<$total; $i++){
                    print_r(mssql_fetch_field($this->result,$i) );
            }
            echo "</pre>";
            echo "<br />";
    }

    //初始化存储过程
    public function init_pro($proNme){
            return mssql_init($proNme,$this->conn);
    }


    //析构函数,关闭数据库,垃圾回收
    public function __destruct()
    {
            if(!empty($this->result)){
                    $this->free();
            }
            mssql_close($this->conn);
    }
 
 
  }
 
   
?>