nullable « Map « JPA Q&A

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1. Is there a way in Hibernate to set not-null to true on save but not delete in a mapping config?    stackoverflow.com

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="org.lexiclan.orm.dao">
 <class name="Address" table="ADDRESSES" lazy="false">
  <id name="addressId" column="ADDRESS_ID">
   <generator class="native" />
  </id>
  <many-to-one name="addressType" column="ADDRESS_TYPE_ID" not-null="true" class="AddressType" ...

2. NHibernate one-to-many entity mapping - does the key column need to be nullable?    stackoverflow.com

In the book Java Persistence with Hibernate under the section titled "Many Valued Associations" there is an example where a parent object (Item) contains a list of associated entity objects ...

3. hibernate field of type map requires nullable = true    stackoverflow.com

Using hibernate 3.6.3.Final I have this Mapping in an entity. 

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER) 
@JoinColumn(name = "policy_id", referencedColumnName = "id", nullable = false)
@MapKeyColumn(name = "document_type", nullable = true) 
@MapKeyEnumerated(EnumType.STRING)
private final ...

4. How to create nullable ManyToOne relationship?    forum.hibernate.org

5. Mapping One-to-many when "one" is nullable?    forum.hibernate.org

I would like to map a many to one relationship between two tables, but the keys on the "many" side don't have a foreign key constraint, because the records on the "many" side can exist in the domain without a corresponding "one" record. When I pull back an entity where the "one" side is populated, my many-to-one relationship works fine. When ...

6. ManyToOne(optional=false) with @Column(nullable=true)    forum.hibernate.org

Hey, I have few entities inherited from a parent entity which is annotated with: @Inheritance(strategy=InheritanceType.SINGLE_TABLE) The subclasses entities has few ManyToOne relationships with other entities, Since all the columns are kept in a SINGLE TABLE all the foreign keys columns must be nullable, (otherwise I get SQL exceptions when saving one of the entities due to missing values of the other ...

7. Nullable data using inheritance in same table (annotations)    forum.hibernate.org

Hibernate version: 3.2 Code between sessionFactory.openSession() and session.close(): Name and version of the database you are using:oracle 9i Hello, I have a supperclass that is extended by two classes and I wish to map them to the same table (using annotations). My problem is that subclass A needs some data to be non null and subclass B doesnt have this data ...