Java put Mysql query result into multimap

Question

For example I have the following MySql table:

A    B     C

1    aaa   2017

1    bbb   2018

2    ccc   2016

2    ddd   2015

I want to put all rows into a multimap structure, using column A as key (the key is not unique, so why multimap). I searched and it seems org.apache.commons.dbutils ResultSetHandler only has BeanMapHandler (but not something like BeanMultiMapHandler).

Is there anyway to put rows into a multimap using column A as key? Thanks.

Answer 1

Google Guava can be a possible soulution. Following code can serve as a guideline：

Multimap<Integer, Map<String, Integer> myMultimap = ArrayListMultimap.create();
// create and inflate nested maps here. Code is not shown 
myMultimap.put(1, nestedMap1);
myMultimap.put(1, nestedMap2);
myMultimap.put(2, nestedMap3);
myMultimap.put(2, nestedMap4);