SpringBoot 学习六：数据库的增删改查

1、新建一个Girl类，添加如下代码：

package controlle;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity

public class Girl {

    @Id
    @GeneratedValue

    private Integer id;

    private String cupSize;

    private Integer age;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getCupSize() {
        return cupSize;
    }

    public void setCupSize(String cupSize) {
        this.cupSize = cupSize;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

}

2、新建一个接口类：GirlRepository，添加如下代码：

package controlle;

import org.springframework.data.jpa.repository.JpaRepository;

public interface GirlRepository extends JpaRepository<Girl, Integer> {
}

3、在GirlController类中，实现增删改查

package controlle;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.websocket.server.PathParam;
import java.util.List;

@RestController
public class GirlController {

    @Autowired
    private GirlRepository girlRepository;

    //查询所有女生
    @GetMapping(value = "/girls")
    public List<Girl> girlsList() {
        return girlRepository.findAll();
    }

    //添加一个女生
    @PostMapping(value = "/girls")
    public Girl girlAdd(@RequestParam("cupSize") String cupSize,
                          @RequestParam("age") Integer age) {
        Girl girl = new Girl();
        girl.setCupSize(cupSize);
        girl.setAge(age);
        return girlRepository.save(girl);
    }

    //查询一个女生
    @GetMapping(value = "/girls/{id}")
    public Girl girlFindOne(@PathVariable("id") Integer id) {
        return girlRepository.findById(id).orElse(null);
    }

    //更新
    @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 girlRepository.save(girl);
    }

    //删除
    @DeleteMapping(value = "/girls/{id}")
    public void girlDelete(@PathVariable("id") Integer id) {
        girlRepository.deleteById(id);
    }
}