Spring data repository query to retrieve values containing null - sql

Question

I have following User table and repository.
User:
id;name;job;age
1;steve;nurse;33
2;steve;programmer;null
3;steve;programmer;null
Repository method:
#Query("SELECT u FROM User u WHERE ("
+ "LOWER(u.name) = LOWER(:name) AND "
+ "LOWER(u.beruf) = LOWER(:job) AND "
+ "LOWER(u.alter) = LOWER(:age))")
public List<User> findUsers(#Param("name") String name,
#Param("job") String job,
#Param("age") String age);
If I call the repository method with following parameters
String name = "steve";
String job = "programmer";
List<User> result = repository.findUsers(name, job, null); // empy list ..why ?
I get an empty list as result, although I expect to get the entities with id=2 and id=3 as result.
What am I doing wrong ? How should I change the query to get the two entities as result.
Thanks

Answer 1

According to the documentation this behaviour is normal there is no way to ignore null fields. using #Query method.
instead you can use the query method specifications.
more information [here][jpa documentaiton]
if you want to keep your existing method you can also go like this:
#Query("SELECT u FROM User u WHERE ("
+ "LOWER(u.name) = LOWER(:name) AND "
+ "LOWER(u.beruf) = LOWER(:job) AND "
+ "( " +
" :age is null or LOWER(u.alter) = LOWER(:age) " +
")"
)
public List<User> findUsers(#Param("name") String name,
#Param("job") String job,
#Param("age") String age);