<?PHP
// MYSQL_CONNECTION: SQL database connection framework for MYSQL_DB
// Release 1.1 - 06/08/2002
// Released under GNU GPL (see LICENSE for details)

define ("LOG_NONE", 0) ;
define ("LOG_ECHO", 1) ;
define ("LOG_HIDE", 2) ;
define ("LOG_FILE", 3) ;

class mysql_conn {
  // Init variables required
  VAR $server   = "" ;
  VAR $user     = "" ;
  VAR $pwd      = "" ;
  VAR $database = "" ;
  VAR $debuglv  = 0 ;
  // Data related variables
  VAR $db           = 0 ;
  VAR $error_level  = 0 ;
  VAR $error_desc   = "No errors" ;
  VAR $logfile      = "datalog" ;
  VAR $filehdl      = 0 ;
  VAR $msg          = "" ;
  // --------- Private methods ---------
  // Error reporting auxiliary method
  function error_report()
    {
    $this->error_level = mysql_errno() ;
    $this->error_desc = mysql_error() ;
    }
  // Opening the database connection
  function connect_to_db()
    {
    // Try to connect to database server...
    $this->db = mysql_connect($this->server,$this->user,$this->pwd) ;
    $this->error_report() ;
    if (!$this->db) {
      // Failed to connect... abort connection process
      $this->msg = date("d/m/Y - H:i:s") . " - ERROR " . $this->error_level . ": " . $this->error_desc . "\r\n" ;
      $this->debug() ;
      $this->release_db() ;
    } else {
      // Try to select a database...
      if (mysql_select_db($this->database,$this->db)) {
        // Everything is ready to work with the database
        $this->msg = date("d/m/Y - H:i:s") . " - OPERATION O.K.: Connected to database " . $this->database .  "\r\n";
      } else {
        // Failed to select the database... abort connection process
        $this->error_report() ;
        $this->msg = date("d/m/Y - H:i:s") . " - ERROR " . $this->error_level . ": " . $this->error_desc . "\r\n" ;
        $this->debug() ;
        $this->release_db() ;
        }
      }
    }
  // Releasing database connection
  function release_db()
    {
    // Do we have a database open?
    if ($this->db) {
      // Must close the connection... not too important as php does by itself...
      if (mysql_close($this->db)) {
        $this->msg = date("d/m/Y - H:i:s") . " - OPERATION O.K.: Database " . $this->database . " released" . "\r\n";
      } else {
        // Failed to liberate the database...
        $this->error_report() ;
        $this->msg = date("d/m/Y - H:i:s") . " - ERROR " . $this->error_level . ": " . $this->error_desc . "\r\n" ;
        }
    } else {
      // No database open
      $this->msg = date("d/m/Y - H:i:s") . " - OPERATION CANCELLED: No database open" . "\r\n";
      }
    // LOG the operation and close logging operations
    $this->debug() ;
    $this->logfile_close() ;
    }
  // Log operations initialization
  function logfile_init()
    {
    $fechagm = gmmktime()+3600 ;
    $fecha = getdate($fechagm) ;
    $this->msg = date("d/m/Y - H:i:s") . " ===== SESSION STARTED BY " . $GLOBALS["PHP_SELF"] . " =====" .  "\r\n" ;
    switch ($this->debuglv) {
      case 0: // NO LOG OPERATIONS
              break ;
      case 1: // SCREEN OUTPUT
              break ;
      case 2: // SILENT OUTPUT (<!-- -->)
              break ;
      case 3: // FILE OUTPUT
              $this->logfile = $this->logfile . "-" . $fecha["mon"] . "-" . $fecha["year"] ;
              $this->filehdl = fopen($this->logfile,'a') ;
              if (!$this->filehdl) {
                echo "<!-- UNABLE TO OPEN SPECIFIED LOG FILE " . $this->logfile . " -->" ;
                $this->debuglv-- ;
                $this->logfile_init() ;
                }
              break ;
      }
    $this->debug() ;
    }
  // Closing log operations
  function logfile_close()
    {
    if ($this->filehdl) {
      // If we opened a file to log operations need to close it
      fclose($this->filehdl) ;
      }
    }
  // Debugging operations
  function debug()
    {
    switch ($this->debuglv) {
      case 0: // NO LOG OPERATIONS
              break ;
      case 1: // SCREEN OUTPUT
              echo '<BR>DEBUG: ' . $this->msg . '<BR>' ;
              break ;
      case 2: // SILENT OUTPUT (<!-- -->)
              echo "\n<!-- DEBUG: " . $this->msg . "-->\n" ;
              break ;
      case 3: // FILE OUTPUT
              fwrite($this->filehdl,$this->msg) ;
              break ;
      }
    }
  // --------- Public interface ---------
  // Initialization
  function init()
    {
    $this->logfile_init() ;
    $this->connect_to_db() ;
    }
  // Destructor
  function destroy()
    {
    $this->release_db() ;
    }
  // Constructor
  function mysql_conn($servername="localhost",$username,$password,$databasename,$debuglevel=0)
    {
    $this->server   = $servername ;
    $this->user     = $username ;
    $this->pwd      = $password ;
    $this->database = $databasename ;
    $this->debuglv  = $debuglevel ;
    }
  }
?>