MybatisPlus 可以插入，读取表中内容不能删除

可以插入，读取表中内容不能删除

@SpringBootTest
public class PetsitterTest {

    @Autowired
    public UserMapper userMapper;

    @Test
    public void select () {
        List<user> list = userMapper.selectList(null);
        for (Object object : list) {
            System.out.println(object);
        }
    }

    @Test
    public void inster (){
        //新增用户信息
        //INSERT INTO user ( user_psw, user_id, user_name, user_img ) VALUES ( ?, ?, ?, ? )
            user user = new user();
            user.setUser_id(19);
            user.setUser_name("nuibi");
            user.setUser_psw("123456");
            user.setUser_img("haokan");
            int insert = userMapper.insert(user);
            System.out.println("受影响的行数:" + insert);
        System.out.println("id:"+user.getUser_id());
        }

    @Test
    public void delete(){
        List<Long> list = Arrays.asList(1L, 2L);
        int i = userMapper.deleteById(19L);
        //int i = userMapper.deleteBatchIds(list);
        System.out.println("删除了："+i);

    }



    }

不会报错

Warn: Could not find @TableId in Class: com.example.pojo.user.
2022-03-19 18:08:59.317  INFO 11708 --- [           main] com.example.PetsitterTest                : Started PetsitterTest in 2.556 seconds (JVM running for 3.694)
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@ffd4cba] was not registered for synchronization because synchronization is not active
2022-03-19 18:08:59.574  INFO 11708 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2022-03-19 18:08:59.775  INFO 11708 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
JDBC Connection [HikariProxyConnection@2043889470 wrapping com.mysql.cj.jdbc.ConnectionImpl@4dad0eed] will not be managed by Spring
==>  Preparing: DELETE FROM user WHERE null=? 
==> Parameters: 1(Long)
<==    Updates: 0
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@ffd4cba]
删除了：0
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@fd09e43] was not registered for synchronization because synchronization is not active
JDBC Connection [HikariProxyConnection@1510312933 wrapping com.mysql.cj.jdbc.ConnectionImpl@4dad0eed] will not be managed by Spring
==>  Preparing: INSERT INTO user ( user_psw, user_id, user_name, user_img ) VALUES ( ?, ?, ?, ? ) 
==> Parameters: 123456(String), 101(Long), nuibi(String), haokan(String)
<==    Updates: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@fd09e43]
受影响的行数:1
id:101
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@52ea0269] was not registered for synchronization because synchronization is not active
JDBC Connection [HikariProxyConnection@2062828451 wrapping com.mysql.cj.jdbc.ConnectionImpl@4dad0eed] will not be managed by Spring
==>  Preparing: SELECT user_psw,user_id,user_name,user_img FROM user 
==> Parameters: 
<==    Columns: user_psw, user_id, user_name, user_img
<==        Row: 123456, 1, qhy, quh
<==        Row: 123456, 2, qhy, quh
<==        Row: 123456, 3, qhy, quh
<==        Row: 123456, 5, nuibi, haokan
<==        Row: 123456, 9, nuibi, haokan
<==        Row: 123456, 10, nuibi, haokan
<==        Row: 123456, 11, nuibi, haokan
<==        Row: 123456, 14, nuibi, haokan
<==        Row: 123456, 15, nuibi, haokan
<==        Row: 123456, 19, nuibi, haokan
<==        Row: 123456, 100, nuibi, haokan
<==        Row: 123456, 101, nuibi, haokan
<==      Total: 12
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@52ea0269]
user(user_id=1, user_img=quh, user_name=qhy, user_psw=123456)
user(user_id=2, user_img=quh, user_name=qhy, user_psw=123456)
user(user_id=3, user_img=quh, user_name=qhy, user_psw=123456)
user(user_id=5, user_img=haokan, user_name=nuibi, user_psw=123456)
user(user_id=9, user_img=haokan, user_name=nuibi, user_psw=123456)
user(user_id=10, user_img=haokan, user_name=nuibi, user_psw=123456)
user(user_id=11, user_img=haokan, user_name=nuibi, user_psw=123456)
user(user_id=14, user_img=haokan, user_name=nuibi, user_psw=123456)
user(user_id=15, user_img=haokan, user_name=nuibi, user_psw=123456)
user(user_id=19, user_img=haokan, user_name=nuibi, user_psw=123456)
user(user_id=100, user_img=haokan, user_name=nuibi, user_psw=123456)
user(user_id=101, user_img=haokan, user_name=nuibi, user_psw=123456)