springdata-qbe

The main goal of this project is to explore basics of Query By Example API in Spring Data environment.

Reference: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#query-by-example

manual

1. matching with non null fields

   Customer customer = // init pattern fields
   
   Example<Customer> customerExample = Example.of(customer);
   
   customerRepository.findOne(customerExample)
   

2. matching with null fields (remember to exclude id field - if it stays the result will be empty)

   ExampleMatcher matcher = matching()
           .withIncludeNullValues()
           .withIgnorePaths("id"); // and other fields that we don't want to have null in result
   
   Customer customer = // init pattern fields
   
   Example<Customer> customerExample = Example.of(customer, matcher);
   
   customerRepository.findOne(customerExample)
   

3. matching with:

   • ignoring case
   • starts with
   • ends with

   ExampleMatcher matcher = matching()
                   .withIgnoreCase()
                   .withMatcher("firstName", GenericPropertyMatcher::startsWith)
                   .withMatcher("lastName", GenericPropertyMatcher::endsWith);
   
   Customer customer = Customer.builder()
                   .firstName("m")
                   .lastName("wicz")
                   .build();
   
   Example<Customer> customerExample = Example.of(customer, matcher);
           
   customerRepository.findOne(customerExample);