php的mssql数据库连接类实例

本文实例讲述了php的mssql数据库连接类实例代码,分享给大家供大家参考。

具体实现代码如下:

class DB_Sql { 

  var $Host     = ""; 

  var $Database = ""; 

  var $User     = ""; 

  var $Password = ""; 

  var $Link_ID  = 0; 

  var $Query_ID = 0; 

  var $Record   = array(); 

  var $Row      = 0; 

   

  var $Errno    = 0; 

  var $Error    = ""; 

  var $Auto_Free = 0;     ## set this to 1 to automatically free results 

   

  function DB_Sql($query = "") { 

      $this->query($query); 

  } 

  function connect() { 

    if ( 0 == $this->Link_ID ) { 

      $this->Link_ID=mssql_connect($this->Host, $this->User, $this->Password); 

      if (!$this->Link_ID) 

        $this->halt("Link-ID == false, mssql_pconnect failed"); 

      else 

          @mssql_select_db($this->Database, $this->Link_ID); 

    } 

  } 

  function free_result(){ 

      mssql_free_result($this->Query_ID); 

      $this->Query_ID = 0; 

  } 

   

  function query($Query_String)  

  { 

     

    /* No empty queries, please, since PHP4 chokes on them. */ 

    if ($Query_String == "") 

      /* The empty query string is passed on from the constructor, 

       * when calling the class without a query, e.g. in situations 

       * like these: '$db = new DB_Sql_Subclass;' 

       */ 

      return 0; 

      if (!$this->Link_ID) 

        $this->connect(); 

     

#   printf("<br>Debug: query = %s<br> ", $Query_String); 

 

 $this->Query_ID = mssql_query($Query_String, $this->Link_ID); 

    $this->Row = 0; 

    if (!$this->Query_ID) { 

      $this->Errno = 1; 

      $this->Error = "General Error (The MSSQL interface cannot return detailed error messages)."; 

      $this->halt("Invalid SQL: ".$Query_String); 

    } 

    return $this->Query_ID; 

  } 

   

  function next_record() { 

       

    if ($this->Record = mssql_fetch_row($this->Query_ID)) { 

      // add to Record[<key>] 

      $count = mssql_num_fields($this->Query_ID); 

      for ($i=0; $i<$count; $i++){ 

          $fieldinfo = mssql_fetch_field($this->Query_ID,$i); 

        $this->Record[strtolower($fieldinfo->name)] = $this->Record[$i]; 

      } 

      $this->Row += 1; 

      $stat = 1; 

    } else { 

      if ($this->Auto_Free) { 

            $this->free_result(); 

          } 

      $stat = 0; 

    } 

    return $stat; 

  } 

   

  function seek($pos) { 

        mssql_data_seek($this->Query_ID,$pos); 

      $this->Row = $pos; 

  } 

  function metadata($table) { 

    $count = 0; 

    $id    = 0; 

    $res   = array(); 

    $this->connect(); 

    $id = mssql_query("select * from $table", $this->Link_ID); 

    if (!$id) { 

      $this->Errno = 1; 

      $this->Error = "General Error (The MSSQL interface cannot return detailed error messages)."; 

      $this->halt("Metadata query failed."); 

    } 

    $count = mssql_num_fields($id); 

     

    for ($i=0; $i<$count; $i++) { 

        $info = mssql_fetch_field($id, $i); 

      $res[$i]["table"] = $table; 

      $res[$i]["name"]  = $info["name"]; 

      $res[$i]["len"]   = $info["max_length"]; 

      $res[$i]["flags"] = $info["numeric"]; 

    } 

    $this->free_result(); 

    return $res; 

  } 

   

  function affected_rows() { 

// Not a supported function in PHP3/4.  Chris Johnson, 16May2001. 

//    return mssql_affected_rows($this->Query_ID); 

    $rsRows = mssql_query("Select @@rowcount as rows", $this->Link_ID); 

    if ($rsRows) {        

       return mssql_result($rsRows, 0, "rows"); 

    } 

  } 

   

  function num_rows() { 

    return mssql_num_rows($this->Query_ID); 

  } 

   

  function num_fields() { 

    return mssql_num_fields($this->Query_ID); 

  } 

  function nf() { 

    return $this->num_rows(); 

  } 

   

  function np() { 

    print $this->num_rows(); 

  } 

   

  function f($Field_Name) { 

    return $this->Record[strtolower($Field_Name)]; 

  }

   

  function p($Field_Name) { 

    print $this->f($Field_Name); 

  } 

   

  function halt($msg) { 

    printf("</td></tr></table><b>Database error:</b> %s<br> ", $msg); 

    printf("<b>MSSQL Error</b>: %s (%s)<br> ", 

      $this->Errno, 

      $this->Error); 

    die("Session halted."); 

  } 

}

希望本文所述对大家的PHP程序设计有所帮助。