public static <T> T queryFirst(String sql, Object... paras) {
		return MAIN.queryFirst(sql, paras);
	}
public static < T > T queryFirst ( String sql , Object ... paras ) { return MAIN . queryFirst ( sql , paras ) ; }
Execute sql query and return the first result. I recommend add "limit 1" in your sql.
@param sql an SQL statement that may contain one or more '?' IN parameter placeholders
@param paras the parameters of sql
@return Object[] if your sql has select more than one column,
and it return Object if your sql has select only one column.