SpringBoot整合JdbcTemplate

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>druid-spring-boot-starter</artifactId>
   <version>1.1.10</version>
</dependency>

<dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <scope>runtime</scope>
   <version>8.0.17</version>
</dependency>

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.username=root
spring.datasource.password=12345678
spring.datasource.url=jdbc:mysql://localhost:3306/spoon

@Service
public class UserService {
    @Autowired
    JdbcTemplate jdbcTemplate;

    public Integer addUser(User user) {
        System.out.println("addUser");
        return jdbcTemplate.update("insert into user (name , address) values (?, ?)", user.getName(), user.getAddress());
    }

    public Integer updateUsernameById(User user){
        System.out.println("updateUsernameById");
        return jdbcTemplate.update("update user set name = ? where id = ?", user.getName(), user.getId());
    }

    public Integer deleteUserById(Integer id){
        System.out.println("deleteUserById");
        return jdbcTemplate.update("delete from user where id = ?", id);
    }

    public List<User> getAllUsers(){
        return jdbcTemplate.query("select * from user", new RowMapper<User>() {
            @Override
            public User mapRow(ResultSet resultSet, int i) throws SQLException {
                User user = new User();
                user.setId(resultSet.getInt("id"));
                user.setName(resultSet.getString("name"));
                user.setAddress(resultSet.getString("address"));
                return user;
            }
        });
    }

    public List<User> getAllUsers2(){
        return jdbcTemplate.query("select * from user", new BeanPropertyRowMapper<>(User.class));
    }
}

@SpringBootTest
class DemoApplicationTests {

    @Autowired
    UserService userService;

    @Test
    void contextLoads() {
        User user = new User();
        user.setName("zhangxin");
        user.setAddress("www.n22.online");
        userService.addUser(user);
    }

    @Test
    void test1(){
        User user = new User();
        user.setId(1);
        user.setName("zhangsanjin");
        userService.updateUsernameById(user);
    }

    @Test
    void test2(){
        userService.deleteUserById(1);
    }

    @Test
    void test3(){
        System.out.println(userService.getAllUsers());
    }

    @Test
    void  test4(){
        System.out.println(userService.getAllUsers2());
    }
}