source: branches/rsr.v5.1.1/web/app/data/modules/data_config.php

<?php

  class data_config extends data
  {

    function config($key = null)
    { $value = false;
      try
      {
        if(isset($key))
        { $sql = "SELECT `value` FROM #--configuration WHERE `key`=".$this->eq($key);
          $rst = $this->sql->query($sql);
          if($v_rst = $this->sql->fetch_assoc($rst)) $value = $v_rst["value"];
          else $value = "";
          $this->sql->free_result($rst);
        }
        else
        { $value = array();
          $sql = "SELECT * FROM #--configuration";
          $rst = $this->sql->query($sql);
          while($v_rst = $this->sql->fetch_assoc($rst)) $value[$v_rst["key"]] = $v_rst["value"];
          $this->sql->free_result($rst);
        }
      }
      catch(Exception $_e) { $value = false; }
      return $value;
    }

    function config_exists($key)
    { $exists = false;
      try
      { $sql = "SELECT count(*) as n FROM #--configuration WHERE `key`=".$this->eq($key);
        $rst = $this->sql->query($sql);
        if($v_rst = $this->sql->fetch_assoc($rst)) $exists = $v_rst["n"];
        $this->sql->free_result($rst);
      }
      catch(Exception $_e) {}
      return $exists;
    }

    function set_config($key, $value)
    { try
      { if($this->config_exists($key)) $sql =
         "UPDATE #--configuration"
        ." SET `value`=".$this->eq($value)
        ." WHERE `key`=".$this->eq($key);
        else $sql =
         "INSERT INTO #--configuration"
        ." VALUES(".$this->eq($key).", ".$this->eq($value).")";
        $this->sql->query($sql);
        return true;
      }
      catch(Exception $_e) {}
      return false;
    }

  }

?>