springboot数据库操作及事物管理操作例子

一.配置文件

pom.xml

    <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

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

application-dev.yml

 server:
   port:
 girl:
   cupSize: B
   age: 

active: dev 这句active后面的dev代码加载的是application-dev.yml这个配置.

ddl-auto: update这句ddl-auto后面是的update代表的是更新这个表,如果的create的话,代表删掉原来的表重新建表,配置完这些之后就不需要我们自己建表
,数据库会给我们建好相应的表.

二.代码

Girl.java

  */
 @Entity
 public class Girl {

     @Id
     @GeneratedValue
     private Integer id;

     @NotBlank(message = "这个字段必传")
     private String cupSize;

     @Min(value = , message = "未成年少女禁止入门")
 //    @NotNull
 //    @Max()
 //    @Length()
     private Integer age;

     @NotNull(message = "金额必传")
     private Double money;

     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;
     }

     public Double getMoney() {
         return money;
     }

     public void setMoney(Double money) {
         this.money = money;
     }
 }

程序是的入口
GirlApplication.java

 @SpringBootApplication
 public class GirlApplication {

     public static void main(String[] args) {
         SpringApplication.run(GirlApplication.class, args);
     }
 }

GirlProperties.java

 @Component
 @ConfigurationProperties(prefix = "girl")
 public class GirlProperties {

     private String cupSize;

     private Integer age;

     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;
     }
 }

GirlController.java

 @RestController
 public class GirlController {

     @Autowired
     private GirlRepository girlRepository;

     @Autowired
     private GirlService girlService;

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

     /**
      * 添加一个女生
　　　　 *
      * @return
      */
     @PostMapping(value = "/girls")
     public Girl girlAdd(@Valid Girl girl, BindingResult bindingResult) {
         if (bindingResult.hasErrors()) {
             System.out.println(bindingResult.getFieldError().getDefaultMessage());
             return null;
         }

         girl.setCupSize(girl.getCupSize());
         girl.setAge(girl.getAge());

         return girlRepository.save(girl);
     }

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

     //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.delete(id);
     }

     //通过年龄查询女生列表
     @GetMapping(value = "/girls/age/{age}")
     public List<Girl> girlListByAge(@PathVariable("age") Integer age) {
         return girlRepository.findByAge(age);
     }

     @PostMapping(value = "/girls/two")
     public void girlTwo() {
         girlService.insertTwo();
     }
 }

最上面添加女生,这个是通过传入Gril这个参数,通过点出get方法来获取对应的属性值,推荐这个写法.

GirlRepository .java

 public interface GirlRepository extends JpaRepository<Girl, Integer> {

     //通过年龄来查询
     public List<Girl> findByAge(Integer age);
 }

GirlService.java

 @Service
 public class GirlService {

     @Autowired
     private GirlRepository girlRepository;

     @Transactional
     public void insertTwo() {
         Girl girlA = new Girl();
         girlA.setCupSize("A");
         girlA.setAge();
         girlRepository.save(girlA);

         Girl girlB = new Girl();
         girlB.setCupSize("BBBB");
         girlB.setAge();
         girlRepository.save(girlB);
     }
 }

GirlService.java这个类是用来测试事物管理.
在这个类的某个方法上加上@Transactional这个注解说明这个方法就已经交由springboot事物管理.有事物管理和没有事物管理的区别是:
有事物管理这个方法内有一个操作失败,如这个类的插入操作,有一个插入失败,这个方法内的操作全部失败.
如果没有事物就只有失败的那一个操作失败.
一般用于同时操作多条数据,只有查询的时候不加事物.