Transforming a result

As a developer, I love this feature, as it helps the developers to transform the returned rows to List, Map, or user-defined Bean.

How to do it...

Now we will take a look at three scenarios of the demonstration code that will convert the records returned by hibernate to List, Map, and Bean.

Here, we use the Transformers class to provide the transforming mechanism to criteria.

Scenario 1: Converting a result to List

All the demos up to this point show that if we use the criteria.list() method, the resultant data is always returned in List. However, you can still use Transformers.TO_LIST in criteria, as follows:

criteria.setResultTransformer(Transformers.TO_LIST);

This means that every row in the result will be represented as a List.

Scenario 2: Converting a result to Map

Now, let's see how to convert the resultant data in Map:

criteria.setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);

This means every object from List represents Map.

Code

For example, the following code shows...