MyBatis-Plus 通用IService使用详解

/**
 * <p>
 * 用户 服务类
 * </p>
 *
 * @author IT贱男
 * @since 2019-06-14
 */
public interface UserService extends IService<User> {

}

/**
 * <p>
 * 用户 服务实现类
 * </p>
 *
 * @author IT贱男
 * @since 2019-06-14
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

}

 @Test
 public void getOne() {
  User one = userService.getOne(Wrappers.<User>lambdaQuery().eq(User::getAge, 31),false);
  System.out.println(one);
 }

 @Test
 public void saveOrUpdateBatch() {
  User user1 = new User();
  user1.setName("兔子");
  user1.setAge(18);

  User user2 = new User();
  user2.setId(1088250446457389060L);
  user2.setName("乌龟");
  user2.setAge(18);

  List<User> users = Arrays.asList(user1, user2);

  boolean b = userService.saveOrUpdateBatch(users);
  System.out.println(b);
 }

 /**
  * lombda查询
  */
 @Test
 public void lambdaQuery(){
  List<User> list = userService.lambdaQuery().eq(User::getAge, 18).list();
  list.forEach(System.out::println);
 }

 /**
  * lombda修改
  */
 @Test
 public void lambdaUpdate(){
  boolean update = userService.lambdaUpdate().eq(User::getAge, 18).set(User::getAge, 31).update();
  System.out.println(update);
 }

 /**
  * lombda删除
  */
 @Test
 public void lambdaRemoce(){
  boolean remove = userService.lambdaUpdate().eq(User::getAge, 18).remove();
  System.out.println(remove);
 }