SpringBoot集成JAP框架

pom.xml

        <!-- 数据库依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.21</version>
        </dependency>
        <!-- JPA框架 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

application.yml

server:
  port: 8888

spring:
  application:
    name: node09-boot-jpa
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/tutu?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

UserRepository.java

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;

@Repository
public interface UserRepository extends JpaRepository<User,Integer> {

    User findByAge(Integer age);
    User findByNameAndAge(String name, Integer age);
    @Query("from User u where u.name=:name")
    User findSql(@Param("name") String name);
}

UserService.java

import org.springframework.stereotype.Service;
import javax.annotation.Resource;

@Service
public class UserService {

    @Resource
    private UserRepository userRepository ;

    // 保存
    public void addUser (User user){
        userRepository.save(user) ;
    }

    // 根据年龄查询
    public User findByAge (Integer age){
        return userRepository.findByAge(age) ;
    }

    // 多条件查询
    public User findByNameAndAge (String name, Integer age){
        return userRepository.findByNameAndAge(name,age) ;
    }

    // 自定义SQL查询
    public User findSql (String name){
        return userRepository.findSql(name) ;
    }

    // 根据ID修改
    public void update (User user){
        userRepository.save(user) ;
    }

    //根据id删除一条数据
    public void deleteStudentById(Integer id){
        userRepository.deleteById(id);
    }

}