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  *  Copyright 2009-2014 Pavel Ponec
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
package org.ujorm.orm;
The OrmUjo is a basic interface of the persistent object in the ORM support. The class can be Serializable. A class that implements the interface must have got a next special features:
  • exactly one Key must be identified as the primary key.
  • A Key for a relation type of many-to-one (for lazy lodading) must be an instance of OrmKey
  • reference to a foreign BO must be able to store an object of any type by the method Ujo.writeProperty(...). This feature is necessary for the proper functioning of the lazy initialization
  • relation many to one can be mapped by a RelationToMany key
  • each table OrmUjo must be registered in the Database by a key type of RelationToMany

public interface OrmUjo extends Ujo {

Read an ORM session where the session is an transient key.
    public Session readSession();

Write an ORM session.
    public void writeSession(Session session);

Returns keys of changed values in a time when any session is assigned. The method is used by a SQL UPDATE statement to update assigned values only. Implementation tip: create a new key type of Set<Key> and in the method writeValue assign the current Key always.

clear True value clears all the key changes.
Key array of the modified values.
    public Key[] readChangedProperties(boolean clear);
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