Hibernate-----One-to-one shared primary key association mappings (map File mode)

Shared primary key affinity mapping: Let two objects have the same primary key value to indicate a one-to-one correspondence between them; database tables do not have additional fields to maintain their relationships, only through the table's primary key

One, one-way Association mappings:

One (Maintenance side: Person)

<?xml version= "1.0" encoding= "UTF-8"? ><! DOCTYPE hibernate-mapping Public "-//hibernate/hibernate mapping dtd3.0//en" "Http://hibernate.sourceforge.net/hiber Nate-mapping-3.0.dtd ">
To
One (non-maintenance side: Idcard)
<?xml version= "1.0" encoding= "UTF-8"? ><! DOCTYPE hibernate-mapping public    "-//hibernate/hibernate mapping DTD 3.0//en"    "http// Hibernate.sourceforge.net/hibernate-mapping-3.0.dtd ">

public void Testonetoone () {       session session = NULL;       try {           session = Hibernateutils.getsession ();           Session.begintransaction ();           Idcard idcard = new Idcard ();           Idcard.setcardno ("111111");             Person person           = new person ();           Person.setname ("name");           Person.setidcard (Idcard);           The attribute of a one-to-one correlation mapping determines that the associated object (Idcard) is saved when the person is saved (by default cascading properties), so the save person can be saved idcard           //maintenance end to save           Session.save ( person);           Session.gettransaction (). commit ();       } catch (Exception e) {           e.printstacktrace ();           Session.gettransaction (). rollback ();       } finally {           hibernateutils.closesession (session);       }    }




Two, two-way association mapping
One (person: maintenance side)
<?xml version= "1.0" encoding= "UTF-8"? ><! DOCTYPE hibernate-mapping public    "-//hibernate/hibernate mapping DTD 3.0//en"    "http// Hibernate.sourceforge.net/hibernate-mapping-3.0.dtd ">
To
One (Idcard: non-maintenance)
<?xml version= "1.0" encoding= "UTF-8"? ><! DOCTYPE hibernate-mapping public    "-//hibernate/hibernate mapping DTD 3.0//en"    "http// Hibernate.sourceforge.net/hibernate-mapping-3.0.dtd ">






Hibernate-----One-to-one shared primary key association mappings (map File mode)