Spring Boot之使用JPA操作mysql

最近刚开始接触spring boot，写了一个操作db的demo，在此记录一下

项目采用maven构建，首先在pom文件中引入spring boot

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.2.RELEASE</version>
</parent>

添加依赖（包括spring boot启动依赖、jpa、mysql、lombok）

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <scope>compile</scope>
    </dependency>
</dependencies>

然后在src/main/ersources目录下新建application.yml文件（application.properties也可以，只是yml文件更方便写配置），配置服务端口、编码、db连接串、jpa策略等等，配置文件内容如下：

server:
  port: 8080
  tomcat:
    uri-encoding: UTF-8
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/monitor?useSSL=false
    username: root
    password: root
    tomcat:
      max-active: 100
      max-idle: 200
      initial-size: 20
  jpa:
    database-platform: org.hibernate.dialect.MySQL5Dialect
    hibernate:
      naming:
        physical-strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

下面开始进入编码，首先创建entity类

@Data
@Entity
@Table(name="sys_order")
public class SysOrder {
   @Id
   private String id;
   @Column(name="PayerName")
   private String payerName;
   @Column(name="OrderID")
   private String orderID;
   @Column(name="PayResult")
   private String payResult;
   @Column(name="Remark")
   private String remark;
   @Column(name="CreatedTime")
   private String createdTime;
}

然后创建一个repository接口

@Repository
public interface SysOrderRepository extends JpaRepository<SysOrder,String>{
   List<SysOrder> findByOrderID(String orderID);
}

最后创建控制器

@SpringBootApplication
@RestController
public class Application {
   @Autowired
   SysOrderRepository orderRepository;
   @RequestMapping("/order/{orderId}")
   public String getOrderInfo(@PathVariable String orderId){
      List<SysOrder> order = orderRepository.findByOrderID(orderId);
      return order.get(0).getPayerName();
   }

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

启动项目，测试代码，完成！

Spring Boot之使用JPA操作mysql

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