Spring Data JPA - #Query with null values based on user input - spring

Question

The user has a form:
checkbox with fields status and priority
submit btn
Objective: Query DB based on these values.
If one of them is null or false, the criteria should be ignored.
Ex: status is checked and priority is not, I want to query only based on status.
The code below will never execute with one of them being false. I also read about Query by Example but could not find a solution.
Null values can indeed be ignored, but need to be previously defined.
I thought about replacing null with something similar to *.
Ex: WHERE c.status = *. It didn't work.
#Query(value = "SELECT * FROM tickets c WHERE c.status = :status AND c.priority= :priority",
nativeQuery = true)
List<Ticket> findByFilter(#Param("status") String status,
#Param("priority") String priority);
Do you have any idea how can I do this?
Thank you

Answer 1

Thank you Simon for pointing me in the right direction.
This was the web page that helped me:
https://dimitr.im/writing-dynamic-queries-with-spring-data-jpa
My situation:
Created a specification class:
public final class DbFilterSpecification {
public static Specification<Ticket> statusContains(String expression) {
return (root, query, builder) -> builder.like(root.get("status"), contains(expression));
}
public static Specification<Ticket> priorityContains(String expression) {
return (root, query, builder) -> builder.like(root.get("priority"), contains(expression));
}
private static String contains(String expression) {
return MessageFormat.format("%{0}%", expression);
}
}
Created a method inside the service layer:
public List<Ticket> findAllWithSpecification(String status, String priority) {
Specification<Ticket> specification = Specification
.where(status == null ? null : DbFilterSpecification.statusContains(status))
.and(priority == null ? null : DbFilterSpecification.priorityContains(priority));
return ticketRepository.findAll(specification);
}