Question

How can I use LIKE expression for case insensitive filtering in hibernate?

The corresponding entry in my hibernate file is:

<filter name="applicantNameFilter" condition="first_name LIKE :nameFilter"/>

Answer 1

Try this

<filter name="applicantNameFilter" condition="first_name ILIKE :nameFilter"/>

or

<filter name="applicantNameFilter" condition="UPPER(first_name) LIKE UPPER(:nameFilter)"/>

For Reference

1. Using ILIKE:

   SELECT * FROM sometable WHERE textfield ILIKE 'value%';    

2. Using Regexp operators (see Functions and Operators in the docs):

   SELECT * FROM sometable WHERE textfield ~* 'value';

3. Using UPPER() or LOWER() to change the case of the field before comparison;
   this approach can be better than 1) or 2) because these functions may be
   indexed, and thus if you are doing a “begins with” or “exact match” search
   your query may be indexed:

   SELECT * FROM sometable WHERE UPPER(textfield) LIKE (UPPER('value') || '%');

4. If most of your searches are “anywhere in field” searches on large text
   fields, I’d reccomend a look at the two “full text search” tools available in
   PostgreSQL, one in the /contrib of your source, the second from openFTS.org.

This is java code

User criteria as

Criteria criteria = getSession().createCriteria(Person.class);
criteria.add(Restrictions.ilike("first_name", first_name, MatchMode.ANYWHERE));
criteria.list();