hibernate单向N-1无表连接级联

今天做到hibernate关系映射单向N-1级联这里憋了一上午终于调通了一个例子有点收获。下边说一下流程

1、创建数据库

address表



person表



建立他们之间的外键关系（关于怎样设置关系查看;http://jingyan.baidu.com/album/5225f26b05a25de6fa0908ae.html?picindex=2）



2、在hibernate中建立他们的实体类

person的实体类

package com.wxb.model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;

import static javax.persistence.GenerationType.IDENTITY;

import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

import org.hibernate.annotations.Cascade;
import org.hibernate.annotations.CascadeType;

/**
* PersonInf entity.
* @author 王校兵
* @version 1.0, 2015-11-27
*/
@Entity
@Table(name = "person_inf")
public class PersonInf implements java.io.Serializable {

// Fields

private Integer personId;
private Integer age;
private String name;
private AddressInf addressInf;

// Constructors

/** default constructor */
public PersonInf() {
}

/** full constructor */
public PersonInf(AddressInf addressInf, Integer age, String name) {
this.addressInf = addressInf;
this.age = age;
this.name = name;
}

// Property accessors
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "person_id", unique = true, nullable = false)
public Integer getPersonId() {
return this.personId;
}

public void setPersonId(Integer personId) {
this.personId = personId;
}

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "address_id", nullable = false)
@Cascade(CascadeType.ALL)
public AddressInf getAddressInf() {
return this.addressInf;
}

public void setAddressInf(AddressInf addressInf) {
this.addressInf = addressInf;
}

@Column(name = "age", nullable = false)
public Integer getAge() {
return this.age;
}

public void setAge(Integer age) {
this.age = age;
}

@Column(name = "name", nullable = false)
public String getName() {
return this.name;
}

public void setName(String name) {
this.name = name;
}

}

address的实体类

package com.wxb.model;

import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;

/**
* PersonInf entity.
* @author 王校兵
* @version 1.0, 2015-11-27
*/
@Entity
@Table(name = "address_inf")
public class AddressInf implements java.io.Serializable {

// Fields

private Integer addressId;
private String addressDetial;

// Constructors

/** default constructor */
public AddressInf() {
}

/** minimal constructor */
public AddressInf(String addressDetial) {
this.addressDetial = addressDetial;
}

// Property accessors
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "address_id", unique = true, nullable = false)
public Integer getAddressId() {
return this.addressId;
}

public void setAddressId(Integer addressId) {
this.addressId = addressId;
}

@Column(name = "addressDetial", nullable = false)
public String getAddressDetial() {
return this.addressDetial;
}

public void setAddressDetial(String addressDetial) {
this.addressDetial = addressDetial;
}

}

最后测试类

package com.wxb.dao;

import org.hibernate.Session;
import org.hibernate.Transaction;

import com.wxb.model.AddressInf;
import com.wxb.model.PersonInf;
import com.wxb.util.HibernateSessionFactory;

/**
* 测试级联dao类
* @author 王校兵
* @version	1.0， 2015-11-27
*
* */
public class PersonCascadeDao {

/**
* 运行的主方法
* */
public static void main(String[] args) {
Session session = HibernateSessionFactory.getSession();
Transaction ts = session.beginTransaction();

PersonInf p = new PersonInf();

AddressInf a = new AddressInf("asdf");

p.setName("123");
p.setAge(12);
p.setAddressInf(a);

session.persist(p);

AddressInf a2 = new AddressInf("123");

p.setAddressInf(a2);

ts.commit();

}
}

执行测试类就可以实现级联。

其中一定要注意cascade级联一定要设置为all不然就会报错。