hibernate mysql 注解主健_Hibernate，JPA注解@PrimaryKeyJoinColumn

最新推荐文章于 2021-09-09 18:40:05 发布

原创最新推荐文章于 2021-09-09 18:40:05 发布 · 561 阅读

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#hibernate mysql 注解主健

一对一(One-to-one)，主键关联

用例代码如下：

数据库DDL语句

1，CAT表

create table CAT

(

id VARCHAR2(32 CHAR) not null,

create_time TIMESTAMP(6),

update_time TIMESTAMP(6),

cat_name VARCHAR2(255 CHAR),

first_name VARCHAR2(255 CHAR),

last_name VARCHAR2(255 CHAR),

version NUMBER(10) not null

)

2，CAT_INFO表

create table CAT_INFO

(

address VARCHAR2(255 CHAR),

birthday TIMESTAMP(6),

cat_id VARCHAR2(32 CHAR) not null

)

hibernate.cfg.xml

/p>

PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"

"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

org.hibernate.dialect.Oracle10gDialect

oracle.jdbc.OracleDriver

jdbc:oracle:thin:@127.0.0.1:1521:orcl

wxuatuser

xlh

true

update

java类

实体类 - 基类

package model;

import java.io.Serializable;

import java.util.Date;

import javax.persistence.Column;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.MappedSuperclass;

import org.hibernate.annotations.GenericGenerator;

/**

* 实体类 - 基类

@MappedSuperclass

public class BaseEntity implements Serializable {

private static final long serialVersionUID = -6718838800112233445L;

private String id;// ID

private Date create_time;// 创建日期

private Date update_time;// 修改日期

@Id

@Column(length = 32, nullable = true)

@GeneratedValue(generator = "uuid")

@GenericGenerator(name = "uuid", strategy = "uuid")

public String getId() {

return id;

}

public void setId(String id) {

this.id = id;

}

@Column(updatable = false)

public Date getCreate_time() {

return create_time;

}

public void setCreate_time(Date create_time) {

this.create_time = create_time;

}

public Date getUpdate_time() {

return update_time;

}

public void setUpdate_time(Date update_time) {

this.update_time = update_time;

}

@Override

public int hashCode() {

return id == null ? System.identityHashCode(this) : id.hashCode();

}

@Override

public boolean equals(Object obj) {

if (this == obj) {

return true;

}

if (obj == null) {

return false;

}

if (getClass().getPackage() != obj.getClass().getPackage()) {

return false;

}

final BaseEntity other = (BaseEntity) obj;

if (id == null) {

if (other.getId() != null) {

return false;

}

} else if (!id.equals(other.getId())) {

return false;

}

return true;

}

实体类

Cat.java

package a8_OneToOne_PrimaryKeyJoinColumn;

import javax.persistence.AttributeOverride;

import javax.persistence.AttributeOverrides;

import javax.persistence.CascadeType;

import javax.persistence.Column;

import javax.persistence.Embedded;

import javax.persistence.Entity;

import javax.persistence.OneToOne;

import javax.persistence.PrimaryKeyJoinColumn;

import javax.persistence.Version;

import model.BaseEntity;

import org.hibernate.annotations.DynamicInsert;

import org.hibernate.annotations.DynamicUpdate;

@Entity

@DynamicInsert

@DynamicUpdate

public class Cat extends BaseEntity{

/**

* 实体类

private static final long serialVersionUID = -2776330321385582872L;

private Cat_Info cat_Info;

private String cat_name;

private Name name;

private int version;

@Version

public int getVersion() {

return version;

}

public void setVersion(int version) {

this.version = version;

}

public String getCat_name() {

return cat_name;

}

public void setCat_name(String cat_name) {

this.cat_name = cat_name;

}

@Embedded

@AttributeOverrides({

@AttributeOverride(name = "first_name", column = @Column(name = "first_name")),

@AttributeOverride(name = "last_name", column = @Column(name = "last_name")) })

public Name getName() {

return name;

}

public void setName(Name name) {

this.name = name;

}

* mappedBy属性：

* 如果关系是单向的，则该关联提供程序确定拥有该关系的字段。

* 如果关系是双向的，则将关联相反(非拥有)方上的 mappedBy 元素设置为拥

* 有此关系的字段或属性的名称

@OneToOne(cascade = CascadeType.ALL,mappedBy="cat")

@PrimaryKeyJoinColumn

public Cat_Info getCat_Info() {

return cat_Info;

}

public void setCat_Info(Cat_Info cat_Info) {

this.cat_Info = cat_Info;

}

Cat_Info.java

package a8_OneToOne_PrimaryKeyJoinColumn;

import java.io.Serializable;

import java.util.Date;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.OneToOne;

import org.hibernate.annotations.GenericGenerator;

import org.hibernate.annotations.Parameter;

@Entity

public class Cat_Info implements Serializable{

/**

* 实体类

private static final long serialVersionUID = 8258082211095664606L;

private Cat cat;

private String address;

private Date birthday;

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}

public Date getBirthday() {

return birthday;

}

public void setBirthday(Date birthday) {

this.birthday = birthday;

}

@OneToOne

@Id

@GeneratedValue(generator = "pkGenerator")

@GenericGenerator(

name = "pkGenerator",

strategy = "foreign",

parameters = @Parameter(name = "property", value = "cat")

)

public Cat getCat() {

return cat;

}

public void setCat(Cat cat) {

this.cat = cat;

}

组件类

package a8_OneToOne_PrimaryKeyJoinColumn;

import java.io.Serializable;

import javax.persistence.Embeddable;

@Embeddable

public class Name implements Serializable {

/**

* 嵌入式组建

private static final long serialVersionUID = -2776330321385582872L;

private String first_name;

private String last_name;

public String getFirst_name() {

return first_name;

}

public void setFirst_name(String first_name) {

this.first_name = first_name;

}

public String getLast_name() {

return last_name;

}

public void setLast_name(String last_name) {

this.last_name = last_name;

}

Dao

package daoUtil;

import org.hibernate.HibernateException;

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 HibernateUtil {

private static final SessionFactory sessionFactory;

static {

try {

Configuration cfg = new Configuration().configure();

ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()

.applySettings(cfg.getProperties()).buildServiceRegistry();

sessionFactory = cfg.buildSessionFactory(serviceRegistry);

} catch (Throwable ex) {

throw new ExceptionInInitializerError(ex);

}

public static Session getSession() throws HibernateException {

return sessionFactory.openSession();

}

public static Object save(Object obj){

Session session = HibernateUtil.getSession();

Transaction tx = null;

try {

tx = session.beginTransaction();

session.save(obj);

tx.commit();

} catch (RuntimeException e) {

if (tx != null) {

tx.rollback();

}

throw e;

} finally {

session.close();

}

return obj;

}

public static void delete(Class> clazz,String id){

Session session = HibernateUtil.getSession();

Transaction tx = null;

try {

tx = session.beginTransaction();

Object obj = session.get(clazz,id);

session.delete(obj);

tx.commit();

} catch (RuntimeException e) {

if (tx != null) {

tx.rollback();

}

throw e;

} finally {

session.close();

}

main

package a8_OneToOne_PrimaryKeyJoinColumn;

import java.util.Date;

import daoUtil.HibernateUtil;

public class Test_OneToOne_PrimaryKeyJoinColumn {

private Cat save(){

Cat_Info info = new Cat_Info();

info.setAddress("201503281");

info.setBirthday(new Date());

Cat cat = new Cat();

cat.setCat_name("a8_OneToOne_PrimaryKeyJoinColumn");

cat.setName(new Name());

cat.setCat_Info(info);

info.setCat(cat);

HibernateUtil.save(cat);

System.out.println(cat.getId());

return cat;

}

public static void main(String[] args) {

Cat cat = new Test_OneToOne_PrimaryKeyJoinColumn().save();

Cat cat1 = (Cat)HibernateUtil.getSession().get(Cat.class, cat.getId());

System.out.println(cat1.getId());

}

环境：JDK1.6，MAVEN，tomcat，eclipse

源码地址：http://files.cnblogs.com/files/xiluhua/hibernate%40PrimaryKeyJoinColumn.rar

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