hibernate 和 jpa 的关系这里就不介绍了,你可以这么理解:hibernate用jpa的方式来实现
1.引入依赖 (jpa里面已经有了hiebrnate的依赖包)
<!--整合hibernate要jpa-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
2.修改 application.properties
datasource的参数跟你整合mybatis一样,不过整合hibernate还得指定jpa的配置
#datasource
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=123
#jpa配置
spring.jpa.database = MYSQL
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
# stripped before adding them to the entity manager)
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
3.创建实体类(这里用注解式开发,没有了.hbm.xml文件)
通过注解将表名和类名,字段名和属性名关联起来,还有指定主键生成策略
package com.liqiye.springbootdemo.entity;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import javax.persistence.Entity;
import javax.persistence.Table;
/**
* @author liqiye
* @description hibernate的实体类
* @date 2019/5/11
*/
@Entity // @Entity标识一个实体类,任何Hibernate映射对象都要有这个注解
@Table(name = "Person")
public class Person implements Serializable{
@Id
// @GeneratedValue(strategy = GenerationType.AUTO) // 这个和默认一样是以Oracle的方式来实现自增主键,会自动生成hibernate_sequence表
@GeneratedValue(strategy = GenerationType.IDENTITY)
protected Long id;
@Column(name = "name")
protected String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Person{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}
4.定义数据库操作接口
类似mybatis的mapper接口一样,包含操作数据库的方法,注入到service层使用,这里用的jpa,继承 JpaRepository 类
JpaRepository 的子类已经实现了简单的增删改查的方法,我们也可以自定义HQL的方法
package com.liqiye.springbootdemo.mapper;
import com.liqiye.springbootdemo.entity.Person;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
// hibernate的接口,springboot整合hibernate用的是jpa,接口要集成JpaRepository
// 里面已经集成了几个方法,额外的查询需要我们手动添加方法HQL
public interface PersonRepository extends JpaRepository<Person,Integer> {
public Person findById(Long id); // 这个在集成的类的子类里面有明确的sql实现,不用再写SQL或者HQL,也可以不写,直接在service里用子类的
public Person save(Person user); // 同上
@Query(value = "SELECT p FROM Person p WHERE name=:name") // 这是HQL :xx 指传入参数,跟下面注解@Param对应
// @Query(value = "SELECT * FROM Person WHERE name=?", nativeQuery = true) // 这是SQL nativeQuery为true代表使用SQL语言
public Person findByName(@Param("name") String name);
}
5.service
package com.liqiye.springbootdemo.service;
import com.liqiye.springbootdemo.entity.Person;
import com.liqiye.springbootdemo.mapper.PersonRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
* @author liqiye
* @description
* @date 2019/5/11
*/
@Service
public class PersonService {
@Autowired
private PersonRepository personRepository;
public Person findById(Long id){
return personRepository.findById(id);
}
public Person findByName(String name){
return personRepository.findByName(name);
}
public void save(Person person){
personRepository.save(person);
}
}
5.controller
package com.liqiye.springbootdemo.controller;
import com.liqiye.springbootdemo.entity.Person;
import com.liqiye.springbootdemo.service.PersonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
/**
* @author liqiye
* @description
* @date 2019/5/11
*/
@Controller
public class PersonController {
@Autowired
private PersonService personService;
@RequestMapping("/findById")
@ResponseBody
public String findById(String id){
return personService.findById(Long.parseLong(id)).toString();
}
@RequestMapping("/findByName")
@ResponseBody
public String findByName(String name){
return personService.findByName(name).toString();
}
@RequestMapping("/save")
@ResponseBody
public String save(){
Person person = new Person();
person.setName("张三");
personService.save(person);
return "插入成功";
}
}
6.测试
运行项目,发现数据库自动创建了person 表
发起接口请求
http://localhost:8080/save
成功插入数据
发起接口请求
http://localhost:8080/findById?id=1
成功返回一条person数据
发起接口请求
http://localhost:8080/findByName?name=张三
成功返回一条person数据
总结:整体下来,跟整合mybatis的用法大同小异,只不过其中的具体实现有点差别。
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