Get a row from the database as a map in sleep mode

Question

Table Players:

ID | name  | email | age | ...
1  | 'bob' | null  | 23  | ...

In this table, instances of the class are stored Player(one row per instance, without composition, etc.).

Having Hibernate Session, how can I get a row (say, with id - PK - 1) as a Java map (key = column name, value = cell value)?

Usage example:

Map<String,String> row = getPlayerByIdAsMap(1);

Answer 1

Use query with AliasToEntityMapResultTransformer; is verbose, but should work with a Hibernate property definition, not a JavaBean definition (they may differ).

Map<String,Object> aliasToValueMap = 
    session.createCriteria(User.class)
      .add(Restrictions.idEq(userID))
      .setProjection(Projections.projectionList()
        .add(Projections.id().as("id"))
        // Add others properties
      )
      .setResultTransformer(AliasToEntityMapResultTransformer.INSTANCE)
    .uniqueResult();

ResultTransformer, ClassMetadata ...

class IntrospectClassMetadata extends BasicTransformerAdapter {
  PassThroughResultTransformer rt = PassThroughResultTransformer.INSTANCE;
  public Object transformTuple(Object[] tuple, String[] aliases) {
    final Object o = rt.transformTuple(tuple, aliases);
    ClassMetadata cm = sf.getClassMetadata(o.getClass());
    List<String> pns = new ArrayList<String>(Arrays.asList(cm.getPropertyNames()));
    Map<String, Object> m = new HashMap<String, Object>();
    for(String pn : pns) {
      m.put(pn, cm.getPropertyValue(o, pn));
    }
    m.put(cm.getIdentifierPropertyName(), cm.getIdentifier(o));
    return m;
  }
}

Map<String,Object> aliasToValueMap = 
        session.createCriteria(User.class)
          .add(Restrictions.idEq(userID))
          .setResultTransformer(new IntrospectClassMetadata())
        .uniqueResult();

:

Map<String,Object> map = (Map<String,Object>)s.createSQLQuery("select * from user where id = :id")
  .setParameter("id",p.id)
  .setResultTransformer(AliasToEntityMapResultTransformer.INSTANCE)
.uniqueResult();

, , ...

Answer 2

HQL

select new Map(p.id as ID, p.name as name, p.email as email, p.age as age)
from Player p

, .

Answer 3

BeanUtils - :

User user = (User) session.get(User.class, userID);
Map map = BeanUtils.describe(user);