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Java中Hibernate单向(1-N)映射实例详解

发布时间：2016-11-28 编辑：jiaochengji.com

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1.hibernate.cfg.xml

<!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>
    
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    
    <property name="hibernate.connection.username">root</property>
    
    <property name="hibernate.connection.password">root</property>
    
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate</property>
    
    <property name="hibernate.c3p0.max_size">20</property>
    
    <property name="hibernate.c3p0.min_size">1</property>
    
    <property name="hibernate.c3p0.timeout">5000</property>
    
    <property name="hibernate.show_sql">true</property>
    
    <property name="hibernate.format_sql">true</property>
    
    <property name="hibernate.use_sql_comments">true</property>

<property name="hibernate.c3p0.max_statements">100</property>
    <property name="hibernate.c3p0.idle_test_period">3000</property>
    <property name="hibernate.c3p0.acquire_increment">2</property>
    <property name="hibernate.c3p0.validate">true</property>
    
    <property name="hbm2ddl.auto">update</property>
    
    <mapping resource="org/Rudiment/hibernate/Member.hbm.xml" />
    <mapping resource="org/Rudiment/hibernate/Address.hbm.xml" />
</session-factory>
</hibernate-configuration>

2.(一)持久化类 Member.java

package org.Rudiment.hibernate;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

public class Member{
    private Integer id;
    private Integer age;
    private String name;
    private Set<Address> addressSet = new HashSet<Address>();

    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Set<Address> getAddressSet() {
        return addressSet;
    }
    public void setAddressSet(Set<Address> addressSet) {
        this.addressSet = addressSet;
    }
}

3.Member.java 的映射规则文件 Member.cfg.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="org.Rudiment.hibernate">
    <class name="Member" table="TEST_MEMBER">
        <id name="id" column="ID">
            <generator class="native"></generator>
        </id>
        <property name="age" column="AGE"></property>
        <property name="name" column="NAME"></property>
        
        <set name="addressSet" cascade="all">
            <key column="member_id" />
            <one-to-many class="Address" />
        </set>
    </class>
</hibernate-mapping>

4.(多)持久化类 Address.java

package org.Rudiment.hibernate;

public class Address
{
    private Integer address_id;
    private String address_detail;

    public Address()
    {}

    public Address(String detail)
    {
        this.address_detail = detail;
    }
    public Integer getAddress_id() {
        return address_id;
    }
    public void setAddress_id(Integer address_id) {
        this.address_id = address_id;
    }
    public String getAddress_detail() {
        return address_detail;
    }
    public void setAddress_detail(String address_detail) {
        this.address_detail = address_detail;
    }
}

5. Address.java 的映射规则文件 Address.cfg.xml

6. 操纵持久化类的处理类 MemberHandler.java

package org.Rudiment.hibernate;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class MemberHandler
{
     public static void insert() {
             Configuration conf = new Configuration();
             conf.configure();
             ServiceRegistry sr = new ServiceRegistryBuilder().applySettings(conf.getProperties()).buildServiceRegistry();
             SessionFactory sf = conf.buildSessionFactory(sr);
             Session session = sf.openSession();
            session.beginTransaction();
            Member m = new Member();
            Address ad1 = new Address("广州天河");
            session.persist(ad1);
            m.setName("IT客栈");
            m.setAge(15);
            m.getAddressSet().add(ad1);
            session.save(m);
            Address ad2 = new Address("上海虹口");
            session.persist(ad2);
            m.getAddressSet().add(ad2);
            session.getTransaction().commit();
            session.close();
        }

    public static void main(String[] args) {
            insert();
    }
}

注:

当运行MemberHandler的时候将发现,后台数据库多了一个 test_member 和 address 的数据表，表的内容如下:

mysql> select * from test_member;
---- ------ --------
| ID | AGE | NAME |
---- ------ --------
| 1 | 15 | IT客栈 |
---- ------ --------
1 row in set (0.00 sec)

mysql> select * from address;
------------ ---------------- -----------
| ADDRESS_ID | ADDRESS_DETAIL | member_id |
------------ ---------------- -----------
| 1 | 广州天河 | 1 |
| 2 | 上海虹口 | 1 |
------------ ---------------- -----------
2 rows in set (0.05 sec)

mysql> select * from test_member,address;
---- ------ -------- ------------ ---------------- -----------
| ID | AGE | NAME   | ADDRESS_ID | ADDRESS_DETAIL | member_id |
---- ------ -------- ------------ ---------------- -----------
| 1 |   15 | IT客栈 |          1 | 广州天河       |         1 |
| 1 |   15 | IT客栈 |          2 | 上海虹口       |         1 |
---- ------ -------- ------------ ---------------- -----------
2 rows in set (0.08 sec)

mysql> desc test_member;
------- -------------- ------ ----- --------- ----------------
| Field | Type         | Null | Key | Default | Extra          |
------- -------------- ------ ----- --------- ----------------
| ID    | int(11)      | NO   | PRI | NULL    | auto_increment |
| AGE   | int(11)      | YES |     | NULL    |                |
| NAME | varchar(255) | YES |     | NULL    |                |
------- -------------- ------ ----- --------- ----------------
3 rows in set (0.02 sec)

Hibernate单向(1-N)含中间连接表映射范例

1.hibernate.cfg.xml

<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

2.(一)持久化类 Member.java

package org.Rudiment.hibernate;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

3.Member.java 的映射规则文件 Member.cfg.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="org.Rudiment.hibernate">
    <class name="Member" table="TEST_MEMBER">
        <id name="id" column="ID">
            <generator class="native"></generator>
        </id>
        <property name="age" column="AGE"></property>
        <property name="name" column="NAME"></property>
        
        <set name="addressSet" cascade="all" table="member_address">
            <key column="member_id" />
            <many-to-many class="Address" unique="true" />
        </set>
    </class>
</hibernate-mapping>

4.(多)持久化类 Address.java

package org.Rudiment.hibernate;

5.Address.java 的映射规则文件 Address.cfg.xml

6.操纵持久化类的处理类 MemberHandler.java

package org.Rudiment.hibernate;

注:

当运行MemberHandler的时候将发现,后台数据库多了一个 test_member、member_address 和 address 的数据表，表的内容如下:

mysql> select * from test_member;
---- ------ --------
| ID | AGE | NAME |
---- ------ --------
| 1 | 15 | IT客栈 |
---- ------ --------
1 row in set (0.00 sec)

mysql> select * from member_address;
----------- -----
| member_id | elt |
----------- -----
| 1 | 1 |
| 1 | 2 |
----------- -----
2 rows in set (0.00 sec)

mysql> desc member_address;
----------- --------- ------ ----- --------- -------
| Field     | Type    | Null | Key | Default | Extra |
----------- --------- ------ ----- --------- -------
| member_id | int(11) | NO   | PRI | NULL    |       |
| elt       | int(11) | NO   | PRI | NULL    |       |
----------- --------- ------ ----- --------- -------
2 rows in set (0.02 sec)

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