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五、数据库操作

1.引入依赖

2.在配置文件中添加信息

3.Girl类的书写

4.GirlRepository继承JpaRepository

5.GirlController的实现，可通过Postman来模拟请求

package com.lcz;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.*;import java.util.List;import java.util.Optional;/** * @Author:Coding Chaozhang */@RestControllerpublic class GirlController {    @Autowired    private GirlRepository repository;    @Autowired    private GirlService girlService;    /**     * 查询所有女生列表     * @return     */    @GetMapping(value = "/girls")    public List
   
      girlList(){        return repository.findAll();    }    /**     * 创建女生信息     * @param cupSize     * @param age     * @return     */    @PostMapping(value = "/girls")    public Girl girlAdd(@RequestParam("cupSize")String cupSize,                           @RequestParam("age")Integer age){        Girl girl=new Girl();        girl.setAge(age);        girl.setCupSize(cupSize);        return repository.save(girl);    }    /**     * 查询一个女生     * @param id     * @return     */    @GetMapping(value = "/girls/{id}")    public Optional
    
      girlFindOne(@PathVariable("id")Integer id){        return repository.findById(id);    }    /**     * 更新一个女生信息     * @param id     * @param cupSize     * @param age     * @return     */    @PutMapping(value = "/girls/{id}")    public Girl girlUpdate(@PathVariable("id")Integer id,                            @RequestParam("cupSize")String cupSize,                            @RequestParam("age") Integer age){        Girl girl=new Girl();        girl.setId(id);        girl.setCupSize(cupSize);        girl.setAge(age);        return repository.save(girl);    }    /**     * 删除女生     * @param id     */    @DeleteMapping(value = "/girls/{id}")    public void girlDelete(@PathVariable("id")Integer id){        repository.deleteById(id);    }    @GetMapping(value = "/girls/age/{age}")    public List
     
       girlListByAge(@PathVariable("age")Integer age) {        return repository.findByAge(age);    }    @PostMapping(value = "/girls/two")    public void girlTwo(){        girlService.insertTwo();    }}
     
    
   

六、事务管理

@Transactional

package com.lcz;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;/** * @Author:Coding Chaozhang */@Servicepublic class GirlService {    @Autowired    private GirlRepository girlRepository;    @Transactional    public void insertTwo(){        Girl girlA=new Girl();        girlA.setCupSize("A");        girlA.setAge(18);        Girl girlB=new Girl();        girlB.setCupSize("A");        girlB.setAge(18);        girlRepository.save(girlA);        girlRepository.save(girlB);    }}

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