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  /* public: table locking */
  function lock($table, $mode = "write") {
    return true; // wg. STRATO
    
    $query = "lock tables ";
    if (is_array($table)) {
      while (list($key,$value) = each($table)) {
        if (!is_int($key)) {
		  // texts key are "read", "read local", "write", "low priority write"
          $query .= "$value $key, ";
        } else {
          $query .= "$value $mode, ";
        }
      }
      $query = substr($query,0,-2);
    } else {
      $query .= "$table $mode";
    }
    $res = $this->query($query);
	if (!$res) {
      $this->halt("lock() failed.");
      return 0;
    }
    return $res;
  }

  function unlock() {
    return true; // wg. STRATO

    $res = $this->query("unlock tables");
    if (!$res) {
      $this->halt("unlock() failed.");
    }
    return $res;
  }