protected function _list_columns($table = '')
	{
		return 'SELECT "colname" FROM "syscat"."columns"
			WHERE LOWER("tabschema") = '.$this->escape(strtolower($this->database)).'
				AND LOWER("tabname") = '.$this->escape(strtolower($table));
	}
protected function _list_columns($table = '')
	{
		return 'SELECT "colname" FROM "syscat"."columns"
			WHERE LOWER("tabschema") = '.$this->escape(strtolower($this->database)).'
				AND LOWER("tabname") = '.$this->escape(strtolower($table));
	}
protected function _list_columns ( $ table = '' ) { return 'SELECT "colname" FROM "syscat"."columns"
			WHERE LOWER("tabschema") = ' . $ this -> escape ( strtolower ( $ this -> database ) ) . '
				AND LOWER("tabname") = ' . $ this -> escape ( strtolower ( $ table ) ) ; }
Show column query

Generates a platform-specific query string so that the column names can be fetched

@param	string	$table
@return	array
Show column query