DB_active_rec.php

class CI_DB_active_record extends CI_DB_driver {
	/**
	 * Select
	 *
	 * Generates the SELECT portion of the query
	 *
	 * @access	public
	 * @param	string
	 * @return	CI_DB_active_record
	 */
	function select($select = '*', $escape = NULL)
	{
		// Set the global value if this was sepecified	
		if (is_bool($escape))
		{
			$this->_protect_identifiers = $escape;
		}
		
		if (is_string($select))
		{
			$select = explode(',', $select);
		}

		foreach ($select as $val)
		{
			$val = trim($val);

			if ($val != '')
			{
				$this->ar_select[] = $val;

				if ($this->ar_caching === TRUE)
				{
					$this->ar_cache_select[] = $val;
					$this->ar_cache_exists[] = 'select';
				}
			}
		}
		return $this;
	}
}