Springboot + jpa  上面是代码

配置

spring:  datasource:    url: jdbc:mysql://localhost:3306/demo    username: root    password: root    driver-class-name: com.mysql.jdbc.Driver  jpa: # jpa 配置    database: mysql    show-sql: true    hibernate:      ddl-auto: update  devtools: # 热部署配置    restart:      enabled: true

实体类

mport javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;/** * * @author rainyday * @createTime 2018/7/2. */@Entitypublic class Cat {    @Id    @GeneratedValue(strategy = GenerationType.AUTO)    private int id;    private String catName;    private int catAge;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getCatName() {        return catName;    }    public void setCatName(String catName) {        this.catName = catName;    }    public int getCatAge() {        return catAge;    }    public void setCatAge(int catAge) {        this.catAge = catAge;    }}

继承

CrudRepository

可以直接调用 jpa的方法

import org.springframework.data.repository.CrudRepository;import springboot.bean.Cat;public interface CatRepository extends CrudRepository
     
      {}
     

Service层

import org.springframework.beans.factory.annotation.Autowired;import org.springframework.cache.annotation.Cacheable;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;import springboot.bean.Cat;import springboot.repository.CatRepository;/** * @author rainyday * @createTime 2018/7/2. */@Servicepublic class CatService {    @Autowired    private CatRepository catRepository;    @Transactional    public void save(Cat cat) {        catRepository.save(cat);    }    @Transactional    public void delete(int id) {        catRepository.deleteById(id);    }    @Cacheable("getAll")    public Iterable
     
       getAll() {        System.out.println("no use cache");        return catRepository.findAll();    }}
     

控制层

import org.springframework.beans.factory.annotation.Autowired;import org.springframework.util.StringUtils;import org.springframework.web.bind.annotation.*;import springboot.bean.Cat;import springboot.service.CatService;/** * @author rainyday * @createTime 2018/7/2. */@RestController@RequestMapping("/cat")public class CatController {    @Autowired    private CatService catService;    @PostMapping("/save")    public void save(@RequestParam(required = false) Cat  cat) {        if (StringUtils.isEmpty(cat)) {            cat = new Cat();            cat.setCatName("jack");        }        cat.setCatAge(3);        catService.save(cat);    }    @RequestMapping("delete")    public String delete() {        catService.delete(1);        return "delete ok!";    }    public Iterable
     
       getAll() {        return catService.getAll();    }}