Hibernate一对一主键单向关联

模型user,address

address对user进行外键关联，意思就是address的主键是由user的主键关联生成的，现有user后有address

user sql语句

CREATE TABLE `NewTable` (
`userid`  int(11) NOT NULL AUTO_INCREMENT ,
`account`  varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL ,
`password`  varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL ,
PRIMARY KEY (`userid`)
)
ENGINE=InnoDB
DEFAULT CHARACTER SET=utf8 COLLATE=utf8_general_ci
AUTO_INCREMENT=6
ROW_FORMAT=COMPACT
;

address sql语句

CREATE TABLE `NewTable` (
`addressid`  int(11) NOT NULL AUTO_INCREMENT ,
`addressinfo`  varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL ,
PRIMARY KEY (`addressid`),
FOREIGN KEY (`addressid`) REFERENCES `user` (`userid`) ON DELETE RESTRICT ON UPDATE RESTRICT
)
ENGINE=InnoDB
DEFAULT CHARACTER SET=utf8 COLLATE=utf8_general_ci
AUTO_INCREMENT=6
ROW_FORMAT=COMPACT
;

user 类

package dto;

import java.io.Serializable;

public class User{
	private int userid;
	
	private String account;
	
	private String password;
	

	public int getUserid() {
		return userid;
	}
	public void setUserid(int userid) {
		this.userid = userid;
	}
	public String getAccount() {
		return account;
	}
	public void setAccount(String account) {
		this.account = account;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
}

user.hbm.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">
<!-- Generated 2015-6-17 22:15:11 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
    <class name="dto.User" table="user" catalog="snlu">
        <id name="userid" type="java.lang.Integer" access="field">
            <column name="userid" />
            <generator class="identity" />
        </id>
        <property name="account" type="string">
            <column name="account" />
        </property>
        <property name="password" type="string">
            <column name="password" />
        </property>

    </class>
</hibernate-mapping>

address类

package dto;

public class Address {
		private String addressinfo;
		private int addressid;
		private User user;
		
		public User getUser() {
			return user;
		}
		public void setUser(User user) {
			this.user = user;
		}
		public String getAddressinfo() {
			return addressinfo;
		}
		public void setAddressinfo(String addressinfo) {
			this.addressinfo = addressinfo;
		}
		public int getAddressid() {
			return addressid;
		}
		public void setAddressid(int addressid) {
			this.addressid = addressid;
		}
		
		
}

address.hbm.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">
<!-- Generated 2015-6-17 22:15:11 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
    <class name="dto.Address" table="address" catalog="snlu">
        <id name="addressid" type="java.lang.Integer" access="field">
            <column name="addressid" />
            <generator class="foreign">
                <param name="property">user</param>
            </generator>
        </id>
        <one-to-one name="user" class="dto.User" constrained="true"></one-to-one>
        <property name="addressinfo" type="string">
            <column name="addressinfo" />
        </property>

    </class>
</hibernate-mapping>

注：若使用hibernate tools生成实体类xml很可能生成的为一对一主键双向关联注意查看 on-to-one标签

hibernate.cfg.xml

<?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="hibernate.bytecode.use_reflection_optimizer">false</property>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password">root</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/snlu</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="hibernate.jdbc.fetch_size">5</property>
        <property name="hibernate.max_fetch_depth">1</property>
        <property name="hibernate.search.autoregister_listeners">false</property>
        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.validator.apply_to_ddl">false</property>
        <mapping resource="dto/User.hbm.xml"/>
        <mapping resource="dto/Address.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

main

package test;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Test;

import util.HibernateUtil;
import dao.DAOFactory;
import dao.UserDAO;
import dao.UserDAOImpl;
import dto.Address;
import dto.User;

public class UserTest {
	public static void main(String[] args) {
		Session session=HibernateUtil.getSessionFactory().openSession();
		Transaction tx=session.beginTransaction();
		User user=new User();
		user.setAccount("jack");
		user.setPassword("111111");
		Address a=new Address();
		a.setAddressinfo("america");
		a.setUser(user);
		
		session.save(user);
		session.save(a);



		tx.commit();
		HibernateUtil.closeSession();
	}
	
	
}

hibernateUtil可在上篇文章hibernate速成中找到

注：将save(user)注释掉，只跑save(address)仍会保存user