Hibernate Study Notes-Article 2 link ing-to-one

Allow-to-one

Assume two objects, respectively person and address.

One address contains multiple persons.

Create classes respectively

 Package  CN. itcase. hibernate. domain;  Public   Class  Address {  Private   Int  ID;  Private  String Street;  Public   Int  GETID (){ Return  ID ;}  Public   Void Setid ( Int  ID ){  This . ID = ID ;}  Public  String getstreet (){  Return  Street ;}  Public   Void  Setstreet (string Street ){ This . Street = Street ;}}  Package  CN. itcase. hibernate. domain;  Public   Class  Person {  Private   Int  ID;  Private  String name;  Private  Address;  Public Address getaddress (){  Return  Address ;}  Public   Void  Setaddress (Address ){  This . Address = Address ;}  Public   Int  GETID (){  Return  ID ;}  Public   Void Setid (Int  ID ){  This . ID = ID ;}  Public  String getname (){  Return  Name ;}  Public   Void  Setname (string name ){  This . Name = Name ;}} 

The corresponding configuration file is

<? XML version = "1.0"?> <! Doctype hibernate-mapping public "-// hibernate/hibernate DTD ing DTD 3.0 // en" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 
 
 

 
// Test multiple-to-one example
 

Package CN. itcast. hibernate; import Java. util. hashset; import Java. util. set; import Org. hibernate. hibernate; import Org. hibernate. session; import Org. hibernate. transaction; import CN. itcase. hibernate. domain. address; import CN. itcase. hibernate. domain. person; public class many2one2 {/*** @ Param ARGs */public static void main (string [] ARGs) {// todo auto-generated method stubperson depart = add (); person EMP = Qu Ery (1); // system. out. println (EMP. getdepart (). getname (); // querydepart (3); // system. out. println (addrquery (1 ). getper (). getname ();} static address addrquery (int id) {session S = NULL; transaction Tx = NULL; try {S = hibernateutil. getsession (); Tx = S. begintransaction (); Address ADDR = (Address) s. get (address. class, ID); // system. out. print (EMP. getdepart (). getname (); hibernate. initialize (ADDR. getstreet (); Tx. commit (); retu Rn ADDR;} finally {If (s! = NULL) s. close () ;}} static person query (int pid) {session S = NULL; transaction Tx = NULL; try {S = hibernateutil. getsession (); Tx = S. begintransaction (); person P = (person) s. get (person. class, pid); Tx. commit (); Return P;} finally {If (s! = NULL) s. close () ;}} static person add () {session S = NULL; transaction Tx = NULL; try {address addr1 = new address (); addr1.setstreet ("Add1 "); person p1 = new person (); p1.setname ("p1"); person P2 = new person (); p2.setname ("p2"); p1.setaddress (addr1); p2.setaddress (addr1 ); S = hibernateutil. getsession (); Tx = S. begintransaction (); S. save (addr1); S. save (P1); S. save (P2); Tx. commit (); Return P1;} finally {If (s! = NULL) S. Close ();}}}