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Hibernate单向1-1含连接表映射实例详解

发布时间：2016-11-28 编辑：jiaochengji.com

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这里小编来给大家介绍Hibernate单向1-1映射，包括了简单的单向1-1含连接表映射与单向1-1含中间连接表映射范例，希望对大家会有所帮助。

Hibernate单向1-1映射范例

其实 Many-to-one 和 one-to-one 非常相似，只需要在 <many-to-one> 的尖括号中添加 unique="true"即可

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;

public class Member{
    private Integer id;
    private Integer age;
    private String name;
    private Address 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 Address getAddress() {
        return address;
    }
    public void setAddress(Address address) {
        this.address = address;
    }
}

3.Member类的映射规则文件 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>
        
        <many-to-one name="address" unique="true" class="Address" cascade="all" lazy="proxy"></many-to-one>
        
    </class>
</hibernate-mapping>

4.(一)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 的地址映射文件

6.对持久化类操纵的类: 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(int i) {
             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();
            m.setAge(24 i);
            m.setName("IT客栈");
            Address ad = new Address("广州" i "路");
            m.setAddress(ad);
            session.save(m);
            session.getTransaction().commit();
            session.close();
        }

     public static Member query(int id)
     {
            Configuration conf = new Configuration();
            conf.configure();
            ServiceRegistry sr = new ServiceRegistryBuilder().applySettings(conf.getProperties()).buildServiceRegistry();
            SessionFactory sf = conf.buildSessionFactory(sr);
            Session session = sf.openSession();
            Member m = (Member)session.get(Member.class, 1);
            session.close();
            return m;
     }

     public static Member addMemberInSameAddress(Member m, int id)
     {
         Configuration conf = new Configuration();
         conf.configure();
         ServiceRegistry sr = new ServiceRegistryBuilder().applySettings(conf.getProperties()).buildServiceRegistry();
         SessionFactory sf = conf.buildSessionFactory(sr);
         Session session = sf.openSession();
         Transaction tx = session.beginTransaction();
         m.setAddress(query(id).getAddress());
         session.save(m);
         tx.commit();
         session.close();
         return m;
     }

    public static void main(String[] args) {
        for(int i=0; i<2; i )
        {
            insert(i);
        }
    }
}

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   | address |
---- ------ -------- ---------
| 1 |   24 | IT客栈 |       1 |
| 2 |   25 | IT客栈 |       2 |
---- ------ -------- ---------
2 rows in set (0.00 sec)

mysql> select * from address;
------------ ----------------
| ADDRESS_ID | ADDRESS_DETAIL |
------------ ----------------
| 1 | 广州0路 |
| 2 | 广州1路 |
------------ ----------------
2 rows in set (0.00 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    |                |
| address | int(11)      | YES | UNI | NULL    |                |
--------- -------------- ------ ----- --------- ----------------
4 rows in set (0.02 sec)

当我们在hibernate中的1对1的模式下如果出现插入重复数据的时候，hibernate将出现下面的报错信息:
Exception in thread "main" org.hibernate.exception.ConstraintViolationException: could not execute statement

单向1-1含中间连接表映射范例

其实 Many-to-one 和 one-to-one 非常相似，只需要在 <many-to-one> 的尖括号中添加 unique="true"即可

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;

3.Member类的映射规则文件 Member.cfg.xml

4.(一)持久化类 Address.java

package org.Rudiment.hibernate;

5.Address.java 的地址映射文件 Address.cfg.xml

6.对持久化类操纵的类: 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 |   24 | IT客栈 |
| 2 |   25 | IT客栈 |
---- ------ --------
2 rows in set (0.00 sec)

mysql> select * from member_address;
----------- ---------
| person_id | address |
----------- ---------
| 1 | 1 |
| 2 | 2 |
----------- ---------
2 rows in set (0.00 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)

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

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