Hibernate ---- N-1 (1), hibernate ---- N-1 (

Hibernate ---- N-1 (1), hibernate ---- N-1 (

* *********************** Hibernate. cfg. xml

<? Xml version = '1. 0' encoding = 'utf-8'?>
<! DOCTYPE hibernate-configuration PUBLIC
"-// Hibernate/Hibernate Configuration DTD 3.0 // EN"
Http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd>

<Hibernate-configuration>

<Session-factory>

<! -- Database connection settings -->
<Property name = "connection. driver_class"> com. mysql. jdbc. Driver </property>
<Property name = "connection. url"> jdbc: mysql: // localhost: 3306/hibernate </property>
<Property name = "connection. username"> root </property>
<Property name = "connection. password"> 123456 </property>

<! -- SQL dialect -->
<Property name = "dialect"> org. hibernate. dialect. MySQL5InnoDBDialect </property>

<! -- Echo all executed SQL to stdout -->
<Property name = "show_ SQL"> true </property>

<! -- Drop and re-create the database schema on startup -->
<Property name = "hbm2ddl. auto"> create </property>

<! -- Names the annotated entity class -->
<Mapping class = "com. ij34.dao. Address"/>
<Mapping class = "com. ij34.dao. People"/>
</Session-factory>

</Hibernate-configuration>

 

 

 

 

 

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Package com. ij34.dao;

Import java. util. HashSet;
Import java. util. Set;

Import javax. persistence .*;

@ Entity
@ Table (name = "lele_inf ")
Public class People implements java. io. Serializable {
Private static final long serialVersionUID = 1L;
@ Id
Private String first;
@ Id
Private String last;
Private int age;
// Record all Address entities associated with the People object
@ Onetoty (targetEntity = Address. class, mappedBy = "people", cascade = CascadeType. ALL)
Private Set <Address> address = new HashSet <> ();
Public String getFirst (){
Return first;
}
Public void setFirst (String first ){
This. first = first;
}
Public String getLast (){
Return last;
}
Public void setLast (String last ){
This. last = last;
}
Public int getAge (){
Return age;
}
Public void setAge (int age ){
This. age = age;
}
Public Set <Address> getAddress (){
Return address;
}
Public void setAddress (Set <Address> address ){
This. address = address;
}

}

**************************************** **********************************

Package com. ij34.dao;

Import javax. persistence .*;

@ Entity
@ Table (name = "Address_inf ")
Public class Address {
@ Id @ Column (name = "address_id ")
@ GeneratedValue (strategy = GenerationType. IDENTITY)
Private int addressId;
Private String message;
@ ManyToOne (targetEntity = People. class)
// Use the composite primary key
@ JoinColumns ({
@ JoinColumn (name = "lele_first", referencedColumnName = "first", nullable = false ),
@ JoinColumn (name = "lele_last", referencedColumnName = "last", nullable = false)
})
Private People people;
Public int getAddressId (){
Return addressId;
}
Public void setAddressId (int addressId ){
This. addressId = addressId;
}
Public String getMessage (){
Return message;
}
Public void setMessage (String message ){
This. message = message;
}
Public People getPeople (){
Return people;
}
Public void setPeople (People people ){
This. people = people;
}

}

**************************************** **************************************** **

Package com. ij34.web;

Import org. hibernate. Session;
Import org. hibernate. SessionFactory;
Import org. hibernate. Transaction;
Import org. hibernate. boot. registry. StandardServiceRegistryBuilder;
Import org. hibernate. cfg. Configuration;
Import org. hibernate. service .*;

Import com. ij34.dao. Address;
Import com. ij34.dao. People;
Public class test01 {
Public static void main (String [] args) throws Exception {
// Instantiate Configuration
Configuration conf = new Configuration (). configure ();
ServiceRegistry SR = new StandardServiceRegistryBuilder (). applySettings (conf. getProperties (). build ();
// Create a SessionFactory instance with a Configuration instance
SessionFactory SF = conf. buildSessionFactory (SR );
// Create session
Session session = SF. openSession ();
// Start transaction
Transaction tx = session. beginTransaction ();
People person = new People ();
Person. setAge (29 );
// Set the value for the two members of the composite primary key
People people = new People ();
People. setAge (22 );
People. setFirst ("surnamed Lin ");
People. setLast (" ");
Address a1 = new Address ();
A1.setMessage ("Guangzhou ");
A1.setPeople (people );
Address a2 = new Address ();
A2.setMessage ("Maoming ");
A2.setPeople (people );
Session. save (people );
Session. save (a1 );
Session. save (a2 );
Tx. commit ();
Session. close ();
SF. close ();
}
}

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