Spring Boot 菜鸟笔记（一）数据库基础

Spring Boot 菜鸟笔记（一）

数据库操作（mysql）

• pom.xml的配置

  <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-data-jpa</artifactId>
      </dependency>
  
      <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
      </dependency>

• application.yml的配置

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/dbgirl
    username: root
    password: 12345
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

• 建立实体类

@Entity
@Table(name="Girl")
public class Girl {
    @Id
    @GeneratedValue
    private Integer id;
    private String cupSize;
    private Integer age;

    public Girl() {
    }

    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;
    }
}

• 建立接口类

 @Repository
public interface GirlRepository extends JpaRepository<Girl,Integer> {
    public List<Girl> findByAge(Integer age);
}

• 建立控制类

@RestController
public class GirlController {
    @Autowired
    public GirlRepository girlRepository;
    @GetMapping(value="/girls")
    public List<Girl> girlList(){
        return girlRepository.findAll();
    }

    @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);
    }

    @GetMapping(value="/girls/{id}")
    public Girl girlFindOne(@PathVariable("id") Integer id){
        return girlRepository.findById(id).get();
    }

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

    @GetMapping(value="girls/age/{age}")
    public List<Girl> girlListByAge(@PathVariable("age") Integer age){
        return girlRepository.findByAge(age);
    }
}