Spring Data mongo case insensitive like query

Question

I want to make a text search case insensitive with regex query with spring-data mongo .

For example in Oracle :

select * from user where lower(username) like '%ab%'

How can i make this query with spring-data mongo ?

Thanks in advance

Answer 1

You can try something like below. Assumes you have a User pojo class.

Using MongoTemplate

i option for case insensitive:

Criteria regex = Criteria.where("username").regex(".*ab.*", "i");      
mongoOperations.find(new Query().addCriteria(regex), User.class);

Using MongoRepository (Case sensitive)

List<User> users = userRepository.findByUserNameRegex(".*ab.*");

interface UserRepository extends MongoRepository<User, String> {
     List<User> findByUserNameRegex(String userName);
}

Using MongoRepository with Query dsl (Case sensitive)

List<User> users = userRepository.findByQuery(".*ab.*");

interface UserRepository extends MongoRepository<User, String> {
     @Query("{'username': {$regex: ?0 }})")
     List<User> findByQuery(String userName);
}

For Non-Regex based query you can now utilize case insensitive search/sort through collation with locale and strength set to primary or secondary:

Query query = new Query(filter);
query.collation(Collation.of("en").
                  strength(Collation.ComparisonLevel.secondary()));
mongoTemplate.find(query,clazz,collection);