PostgreSQL JDBC Null String taken as a bytea

Question

If entity.getHistory() is null following code snippet:

(getEntityManager() returns spring injected EntityManager, database field history type is: text or varchar2(20

Answer 1

You can cast the parameter to a proper type in the query. I think this solution should work for other databases, too.

Before:

@Query("SELECT person FROM people person"
     + " WHERE (?1 IS NULL OR person.name = ?1)")
List getPeopleWithName(final String name);

After:

@Query("SELECT person FROM people person"
     + " WHERE (?1 IS NULL OR person.name = cast(?1 as string))")
List getPeopleWithName(final String name);

Also works for LIKE statements:

person.name LIKE concat('%', cast(?1 as string), '%')

and with numbers (here of type Double):

person.height >= cast(cast(?1 as string) as double)