使用MyBatis-Plus提供的通用Service，测试增删改查操作

UserServiceImpl.java

package com.dzqc.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.dzqc.mapper.UserMapper;
import com.dzqc.pojo.User;
import com.dzqc.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * ServiceImpl是MyBatis-Plus提供的通用Service实现类
 * ServiceImpl<mapper接口类型>
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper,User> implements IUserService {
    /*@Autowired
    private UserMapper userMapper;
    @Override
    public void getUsers() {

    }*/
}

IUserService.java

package com.dzqc.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.dzqc.pojo.User;

/**
 * 业务逻辑层
 * 调用dao层
 * IService 通用Service接口，里面包含有各种save。。。update。。。remove。。。get。。。list。。page
 */
public interface IUserService extends IService<User> {
    /*void getUsers();*/
}

Service类

package com.dzqc;

import com.dzqc.pojo.User;
import com.dzqc.service.IUserService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.Arrays;
import java.util.List;

@SpringBootTest
public class ServiceTest {
    @Autowired
    private IUserService userService;

    @Test
    public void testGet(){
        List<User> list = userService.list();//调用service中查询方法
        list.forEach(System.out::println);
    }
    @Test
    public void testadd(){
        User user = new User();
        user.setName("Betty");
        user.setAge(23);
        user.setEmail("[email protected]");
        boolean save = userService.save(user);
        System.out.println("save = " + save);
    }
    @Test
    public void testUpdate(){
        //调用service中查询方法
        User user = new User();
        user.setId(1651053072898105346L);
        user.setName("nina");
        boolean b = userService.updateById(user);
        System.out.println("b = " + b);
    }
    @Test
    public void testRem(){
        //List<Long> longs = Arrays.asList(3L, 4L);
        long count = userService.count();
        System.out.println("count = " + count);
    }
    @Test
    public void testDelete(){
        boolean b = userService.removeById(2L);
        System.out.println("b = " + b);

    }
}