mapping Hibernate query results to custom class?

Question

Following up on a question I posted yesterday: How to populate POJO class from custom Hibernate query?

Can someone show me an example of how to code the following SQ

Answer 1

YMMV but I've found that the key factor is you must make sure to alias every field in your SELECT clause with the SQL "AS" keyword. I've never had to use quotes around the alias names. Also, in your SELECT clause use the case and punctuation of the actual columns in your database and in the aliases use the case of the fields in your POJO. This has worked for me in Hibernate 4 and 5.

@Autowired
private SessionFactory sessionFactory;

...

String sqlQuery = "SELECT firstName AS firstName," +
        "lastName AS lastName from Employee";

List employeeList = sessionFactory
        .getCurrentSession()
        .createSQLQuery(sqlQuery)
        .setResultTransformer(Transformers.aliasToBean(Results.class))
        .list();

If you have multiple tables you can use table aliases in the SQL as well. This contrived example with an additional table named "Department" uses more traditional lower case and underscores in database field names with camel case in the POJO field names.

String sqlQuery = "SELECT e.first_name AS firstName, " +
        "e.last_name AS lastName, d.name as departmentName" +
        "from Employee e, Department d" +
        "WHERE e.department_id - d.id";

List employeeList = sessionFactory
        .getCurrentSession()
        .createSQLQuery(sqlQuery)
        .setResultTransformer(Transformers.aliasToBean(Results.class))
        .list();