复制代码 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.\");
  }
}