Question

In the below query on passing a list of office codes, I get a list of countryID’s. Now instead of that, I need a Map In which the key will be countryID and its value as the list of office codes. Can you please help me.

Example: If we have offices as abc, def belong to country 123 and xyz belongs to 789, I need a Map like
(123, List(abc,def)…. (789,List(xyz)))

public List getData(List officeCode) {

    try {
        StringBuffer queryString = new StringBuffer("select distinct 
        (abc.countryID)  from com.#####.TABLE table");
        queryString.append(" where table.officeCode in (:oCode)");
        return SessionFactory.getCurrentSession()
        .createQuery(queryString.toString())
        .setParameterList("oCode",officeCode )
        .list();
    }
    catch (Exception e)

    {
        e.printStackTrace();
        return null;
    }

}

Answer 1

Execute the following query:

select distinct abc.countryID, abc.officeCode from SomeEntity abc where abc.officeCode in (:codes)

This query will return a List<Object[]>, each object array containing a countryID as first element and an office code as second element.

Then iterate through the list, and populate your map.

Note: using a StringBuffer to concatenate String literals is counter-productive, and less readable. You’d better simply do:

String queryString = "select distinct (abc.countryID)  from com.#####.TABLE table"
                     + " where table.officeCode in (:oCode)";