多对一单向关联

Group 表

'CREATE TABLE `t_group` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8'

 

User表

'CREATE TABLE `t_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `userGroup` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `FK_jog6r2ybduivtuy35bqrtwtjx` (`userGroup`),
  CONSTRAINT `FK_jog6r2ybduivtuy35bqrtwtjx` FOREIGN KEY (`userGroup`) REFERENCES `t_group` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8'

 

Annotation方法

User类

package hibernate.entities;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name="t_user")
public class User {

	private int id;
	private String name;
	private Group group;
	
	@Id
	@GeneratedValue
	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;
	}
	
	@ManyToOne
	@JoinColumn(name="userGroup")
	public Group getGroup() {
		return group;
	}
	public void setGroup(Group group) {
		this.group = group;
	}
	
	
}

 

Group类

package hibernate.entities;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="t_group")
public class Group {

	private int id;
	private String name;
	
	@Id
	@GeneratedValue
	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;
	}
	
	
}

 

 XML方法：

User.hbm.xml

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

<hibernate-mapping package="hibernate.entities">
    <class name="User" table="t_user">
       <id name="id" column="id">
       	<generator class="native"></generator>
       </id>
       
       <property name="name" column="name"/>
       
       <many-to-one name="group"></many-to-one>
       
    </class>
</hibernate-mapping>

 

 Group.hbm.xml

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

<hibernate-mapping package="hibernate.entities">
    <class name="Group" table="t_group">
       <id name="id" column="id">
       	<generator class="native"></generator>
       </id>
       
       <property name="name" column="name"/>
       
    </class>
</hibernate-mapping>