Springboot基础篇（二） 简单的增删改查

springboot简单的增删改查：

1.底层代码实现

public interface GirlRespository extends JpaRepository<Girl,Integer>{ //通过年龄 public List<Girl> findByAge(Integer age); }

2增删改查：

@Autowired private GirlRespository girlRespository; //所有的记录 @GetMapping(value = "/girls") @GetMapping public List<Girl> girlList(){ return girlRespository.findAll(); } //增加一条记录 @PostMapping(value = "/addgirl") @PostMapping public Girl girladd(@RequestParam("cupSize") String cupSize, @RequestParam("age") Integer age ){ Girl girl=new Girl(); girl.setAge(age); girl.setCupSize(cupSize); return girlRespository.save(girl); } // 根据id进行查询 @GetMapping @GetMapping(value = "/find/{id}") public Girl findOne(@PathVariable("id") Integer id){ return girlRespository.findOne(id); } //根据id进行更新 @PutMaping @PutMapping(value = "/update/{id}") public Girl updateGirl(@PathVariable("id") Integer id, @RequestParam("age") Integer newage, @RequestParam("cupsize") String newSize) { Girl girl=new Girl(); girl.setId(id); girl.setAge(newage); girl.setCupSize(newSize); return girlRespository.save(girl); } //根据id删除记录 @DeleteMaping @DeleteMapping(value = "/delete/{id}") public void girldelete(@PathVariable("id") Integer id){ girlRespository.delete(id); } @GetMapping(value = "/findage/{age}") public List<Girl> findByAge(@PathVariable("age") Integer age){ return girlRespository.findByAge(age); }

事务篇： 注：在增加，删除，更新记录是，请添注解： @Transactional

@Transactional public void insertTwo(){ Girl girl=new Girl(); girl.setCupSize("E"); girl.setAge(187777); girlRespository.save(girl); Girl girl2=new Girl(); girl2.setAge( null); girl2.setCupSize("F"); girlRespository.save(girl2); }

参考地址：（典型的老司机） http://www.imooc.com/learn/810