Case-insensitive search using Hibernate

Question

I\'m using Hibernate for ORM of my Java app to an Oracle database (not that the database vendor matters, we may switch to another database one day), and I want to retrieve objec

Answer 1

Since Hibernate 5.2 session.createCriteria is deprecated. Below is solution using JPA 2 CriteriaBuilder. It uses like and upper:

    CriteriaBuilder builder = session.getCriteriaBuilder();
    CriteriaQuery<Person> criteria = builder.createQuery(Person.class);
    Root<Person> root = criteria.from(Person.class);

    Expression<String> upper = builder.upper(root.get("town"));
    criteria.where(builder.like(upper, "%FRAN%"));

    session.createQuery(criteria.select(root)).getResultList();

Answer 2

This can also be done using the criterion Example, in the org.hibernate.criterion package.

public List findLike(Object entity, MatchMode matchMode) {
    Example example = Example.create(entity);
    example.enableLike(matchMode);
    example.ignoreCase();
    return getSession().createCriteria(entity.getClass()).add(
            example).list();
}

Just another way that I find useful to accomplish the above.

Answer 3

You could look at using Compass a wrapper above lucene.

http://www.compass-project.org/

By adding a few annotations to your domain objects you get achieve this kind of thing.

Compass provides a simple API for working with Lucene. If you know how to use an ORM, then you will feel right at home with Compass with simple operations for save, and delete & query.

From the site itself. "Building on top of Lucene, Compass simplifies common usage patterns of Lucene such as google-style search, index updates as well as more advanced concepts such as caching and index sharding (sub indexes). Compass also uses built in optimizations for concurrent commits and merges."

I have used this in the past and I find it great.

Answer 4

For the simple case you describe, look at Restrictions.ilike(), which does a case-insensitive search.

Criteria crit = session.createCriteria(Person.class);
crit.add(Restrictions.ilike('town', '%fran%');
List results = crit.list();

Answer 5

You also do not have to put in the '%' wildcards. You can pass MatchMode (docs for previous releases here) in to tell the search how to behave. START, ANYWHERE, EXACT, and END matches are the options.

Answer 6

Criteria crit = session.createCriteria(Person.class);
crit.add(Restrictions.ilike('town', 'fran', MatchMode.ANYWHERE);
List results = crit.list();