wpdb::load_col_info()

	protected function load_col_info() {
		if ( $this->col_info )
			return;

		if ( $this->use_mysqli ) {
			$num_fields = mysqli_num_fields( $this->result );
			for ( $i = 0; $i < $num_fields; $i++ ) {
				$this->col_info[ $i ] = mysqli_fetch_field( $this->result );
			}
		} else {
			$num_fields = mysql_num_fields( $this->result );
			for ( $i = 0; $i < $num_fields; $i++ ) {
				$this->col_info[ $i ] = mysql_fetch_field( $this->result, $i );
			}
		}
	}