hi all:
i use the following query in JPQL to query the people whose address column
is empty.
List rl = em.createQuery( "select o from Person as o where o.address IS
NULL" ).setMaxResults( 50).getResultList(); ...
this line of code always return an empty list, obviously the table does has
entries that match the condition.
class Person { Address address; String name; ... } class Address { String
name; ... }
anyone knows what's wrong with this jpql statement? thanks in advance.
by the way, the address has annotation like below:
@ManyToOne( fetch = FetchType.EAGER,cascade = { CascadeType.PERSIST,
CascadeType.MERGE } )
@Column( name = "AddressID" )
private Address address;
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