I have a simple one-to-many relationship. When I insert child record for a parent, hibernate initializes the lazy collection for the parent. Even though there is no change in the parent attributes. The lazy collection should not initialize. This is big performance issue as the performance degrades if there are more children for the parent.
Any help to overcome/resolve this issue?
Thanks in advance !!!
Example:
Parent Object = Person
Child Object = Pfolder
Mapping definition:
<!-- One-to-Many Relation -->
<class name="net.sf.hibernate.examples.quickstart.Person" table="PERSON" dynamic-update="true">
<id name="id" type="string" unsaved-value="null" >
<column name="person_ID" sql-type="varchar(255)" not-null="true"/>
<generator class="assigned"/>
</id>
<property name="name" type="string"/>
<set name="folders" lazy="true" table="PFOLDER">
<key column="person_id"/>
<one-to-many class="net.sf.hibernate.examples.quickstart.Pfolder"/>
</set>
</class>
<class name="net.sf.hibernate.examples.quickstart.Pfolder" table="PFOLDER" dynamic-update="true">
<id name="id" type="string" unsaved-value="null" >
<column name="folder_ID" sql-type="varchar(255)" not-null="true"/>
<generator class="assigned"/>
</id>
Code:
public void createFolderPerson(PrintWriter out)
throws HibernateException {
out.print("<h3>Creating Folder for Person:</h3>");
try {
String id = "101";
String name = null;
Class cls = Class.forName("net.sf.hibernate.examples.quickstart.Person");
Person person = (Person) session.load(cls, id);
out.println("Creating folder for this person:");
// new folder
Pfolder pfld = new Pfolder();
pfld.setId(new String("111"));
pfld.setName("folder 111");
pfld.setParent(person);
session.save(pfld);
} catch (Exception e) {
e.printStackTrace();
}
}
===============================================
Logs:
- net.sf.hibernate.examples.quickstart.SampleServlet - before begin transaction
- net.sf.hibernate.examples.quickstart.SampleServlet - before session.load
Hibernate: select person0_.person_ID as person_ID0_, person0_.name as name0_ from PERSON person0_ where person0_.person_ID=?
- net.sf.hibernate.examples.quickstart.SampleServlet - after session.load
Hibernate: select pfolder0_.folder_ID as folder_ID__, pfolder0_.person_id as person_id__, pfolder0_.folder_ID as folder_ID0_, pfolder0_.person_id as person_id0_, pfolder0_.name as name0_ from PFOLDER pfolder0_ where pfolder0_.person_id=?
Hibernate: select person0_.person_ID as person_ID0_, person0_.name as name0_ from PERSON person0_ where person0_.person_ID=?
- net.sf.hibernate.examples.quickstart.SampleServlet - before session.save
- net.sf.hibernate.examples.quickstart.SampleServlet - after session.save
Hibernate: insert into PFOLDER (person_id, name, folder_ID) values (?, ?, ?)
Hibernate: update PFOLDER set person_id=? where folder_ID=?
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