hibernate 多对多注解配置

1、在公司一个员工对应多个部门，一个部门对应多个员工，因此部门与员工之间就是多对多的关系。

Person类的代码如下：

package com.mr.cheng.bean;import java.util.Set;import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;import org.hibernate.annotations.Cascade;@Entity
public class Person {private Integer id;private String name;private int age;private double price;private Set<Dept> depts;/*** 多对多由一方来完成，*/@ManyToMany(cascade=CascadeType.ALL)@JoinTable(name="personDeptTable",/*** 这一方的Id*/joinColumns={@JoinColumn(name="personId")},/*** 反转的另外一段的列名,既对方一张表的Id* @return*/inverseJoinColumns={@JoinColumn(name="deptId")})public Set<Dept> getDepts() {return depts;}@Overridepublic String toString() {return "Person [id=" + id + ", name=" + name + ", age=" + age+ ", price=" + price + ", depts=" + depts + "]";}public void setDepts(Set<Dept> depts) {this.depts = depts;}@Id@GeneratedValuepublic Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}
}

　　Dept类的代码如下：

package com.mr.cheng.bean;import java.util.Set;import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;@Entity
@Table(name="deptTable")
public class Dept {private int id;private String name;private Set<Person>persons;@Id@GeneratedValuepublic 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;}@ManyToMany(mappedBy="depts")public Set<Person> getPersons() {return persons;}public void setPersons(Set<Person> persons) {this.persons = persons;}
}

2、hibernate.hbm.xml配置如下：

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration><session-factory><property name="connection.driver_class">com.mysql.jdbc.Driver</property><property name="connection.url">jdbc:mysql://localhost/test</property><property name="connection.username">root</property><property name="connection.password">root</property><property name="dialect">org.hibernate.dialect.MySQLDialect</property><!--<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property><property name="connection.url">jdbc:oracle:thin:@localhost:1521:SXT</property><property name="connection.username">scott</property><property name="connection.password">tiger</property><property name="dialect">org.hibernate.dialect.OracleDialect</property>--><!-- JDBC connection pool (use the built-in) --><property name="connection.pool_size">1</property><!-- Enable Hibernate's automatic session context management --><property name="current_session_context_class">thread</property><!-- Disable the second-level cache  --><property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property><!-- Echo all executed SQL to stdout --><property name="show_sql">true</property><property name="format_sql">true</property><mapping class="com.mr.cheng.bean.Dept" /><mapping class="com.mr.cheng.bean.Person" /></session-factory></hibernate-configuration>

3、测试代码如下：

package com.mr.cheng.test;import java.util.Date;
import java.util.HashSet;import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;import com.mr.cheng.bean.Dept;
import com.mr.cheng.bean.Person;public class HibernateTest {private static SessionFactory sessionFactory;//@BeforeClasspublic static void beforeClass() {sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();}//@AfterClasspublic static void afterClass() {sessionFactory.close();}@Testpublic void testSchemaExport() {new SchemaExport(new AnnotationConfiguration().configure()).create(true, true);}public static void main(String[] args) {beforeClass();}/*** 多对多单向*/@Testpublic void testManyToManyAddPersonAndDept(){new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();Session session = sessionFactory.openSession();session.beginTransaction();Dept dept = new Dept();dept.setName("财务部");Dept dept1 = new Dept();dept1.setName("财务部");Person person = new Person();person.setName("A111");person.setAge(33);person.setPrice(33);Person person1 = new Person();person1.setName("A111");person1.setAge(33);person1.setPrice(33);person.setDepts(new HashSet<Dept>());person1.setDepts(new HashSet<Dept>());person.getDepts().add(dept);person.getDepts().add(dept1);person1.getDepts().add(dept);person1.getDepts().add(dept1);session.save(person1);session.save(person);/*session.save(dept1);session.save(dept);*/session.getTransaction().commit();}/*** 多对多单向查询 Person 一方*/@Testpublic void testManyToManyQueryPerson(){new SchemaExport(new AnnotationConfiguration().configure()).create(false, false);sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();Session session = sessionFactory.openSession();session.beginTransaction();Person p = (Person) session.load(Person.class, 1);System.out.println(p.getDepts());session.getTransaction().commit();}/*** 多对多单向查询 Dept 一方*/@Testpublic void testManyToManyQueryDept(){new SchemaExport(new AnnotationConfiguration().configure()).create(false, false);sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();Session session = sessionFactory.openSession();session.beginTransaction();Dept dept = (Dept) session.load(Dept.class, 1);System.out.println(dept.getPersons());session.getTransaction().commit();}@Testpublic void testManyToManyAddPersonAndDept1(){sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();Session session = sessionFactory.openSession();session.beginTransaction();Dept dept = new Dept();dept.setName("财务部");Dept dept1 = new Dept();dept1.setName("财务部");Person person = new Person();person.setName("A111");person.setAge(33);person.setPrice(33);Person person1 = new Person();person1.setName("A111");person1.setAge(33);person1.setPrice(33);dept1.setPersons(new HashSet());dept.setPersons(new HashSet());dept1.getPersons().add(person1);dept1.getPersons().add(person);/*  session.save(person1);session.save(person);*/session.save(dept1);session.save(dept);session.getTransaction().commit();}
}

转载于:https://www.cnblogs.com/chengAddress/p/4365953.html

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