Department.java
package com.many2one.bean;
import java.util.Set;
public class Department {
private int id;
private String name;
private Set<Employee> sets;
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;
}
public Set<Employee> getSets() {
return sets;
}
public void setSets(Set<Employee> sets) {
this.sets = sets;
}
}
Employee.java
package com.many2one.bean;
public class Employee {
private int id;
private String name;
private Department department;
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;
}
public Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
}
映射文件
Department.hbm.xml
<?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-mapping package="com.many2one.bean">
<class name="Department" table="department" catalog="Hibernate_Many2One">
<id name="id" column="id">
<generator class="native"/>
</id>
<property name="name" column="name"/>
</class>
</hibernate-mapping>
Employee.hbm.xml
<?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-mapping package="com.many2one.bean">
<class name="Employee" table="employee" catalog="Hibernate_Many2One">
<id name="id" column="id">
<generator class="native"/>
</id>
<property name="name" column="name"/>
<many-to-one name="department" column="deptid" cascade="all" />
</class>
</hibernate-mapping>
導出的sql
create table Hibernate_Many2One.department (
id integer not null auto_increment,
name varchar(255),
primary key (id)
)
create table Hibernate_Many2One.employee (
id integer not null auto_increment,
name varchar(255),
deptid integer,
primary key (id)
)
alter table Hibernate_Many2One.employee
add index FK4722E6AE3829E242 (deptid),
add constraint FK4722E6AE3829E242
foreign key (deptid)
references Hibernate_Many2One.department (id)
測試代碼
@Test
public void insert(){
Session session=HibernateSessionFactory.getSession();
Transaction transaction=session.beginTransaction();
try {
transaction.begin();
Department department=new Department();
department.setName("軟件測試部");
Employee employee=new Employee();
employee.setName("張三");
employee.setDepartment(department);
session.save(employee);
transaction.commit();
} catch (HibernateException e) {
e.printStackTrace();
}
}
@Test
public void select(){
Session session=HibernateSessionFactory.getSession();
try {
Employee employee=(Employee) session.get(Employee.class, 1);
System.out.println(employee.getName());
System.out.println(employee.getDepartment().getName());
} catch (HibernateException e) {
e.printStackTrace();
}
}