mybatis-plus

1. insert(T):int

  @Test
    public void insert(){
        User user = new User();
        user.setId(new Long(9));
        user.setName("haibaraguo");
        user.setAge(21);
        user.setEmail("1156544355@qq.com");
        userMapper.insert(user);
        System.out.println(userMapper.selectById(9).toString());
    }

2. deleteById(Serialzable):int

   @Test
    public void deleteById(){
        userMapper.deleteById(9);
        System.out.println(userMapper.selectById(9));
    }

3. deleteByMap(Map):int

 @Test
    public void deleteByMap(){
        Map<String, Object> columnMap = new HashMap<String, Object>();
        columnMap.put("name", "我日你哥");
        int result=userMapper.deleteByMap(columnMap);
        System.out.println("*******************\n"+result);
    }

4. delete(Wrapper):int

  @Test
    public void delete(){
        int result = userMapper.delete(new QueryWrapper<User>().eq("id",7));
        System.out.println("*******************\n"+result);
    }

5. deleteBatchIds(Collection<? extends Serializable>):int

  @Test
    public void deleteBatchIds(){
        List<Long> ids = new ArrayList<>();
        ids.add(new Long(4));
        ids.add(new Long(5));
        int result = userMapper.deleteBatchIds(ids);
        System.out.println("*******************\n"+result);
    }

6. updateById(T):int

  @Test
    public void updateById(){
        User user = userMapper.selectById(3);
        user.setName("我爱你");
        int result = userMapper.updateById(user);
        System.out.println("*******************\n"+result);
    }

7. update(T,Wrapper):int

 @Test
    public void update(){
        int result = userMapper.update(null,new UpdateWrapper<User>().set("name","我爱你").set("age",38).le("age",20));
        System.out.println("*******************\n"+result);
    }

8.selectById(Serializable):T

 @Test
    public void selectById(){
        User user = userMapper.selectById(2);
        System.out.println("*******************\n"+user.toString());
    }

9. selectBatchIds(Collection<? extends Serializable>):List

  @Test
    public void selectBatchIds(){
        List<Long> ids = new ArrayList<>();
        ids.add(new Long(1));
        ids.add(new Long(2));
        List<User> users = userMapper.selectBatchIds(ids);
        users.forEach(System.out::println);
    }

10. selectByMap(Map):List

 @Test
    public void selectByMap(){
        Map<String,Object> map = new HashMap<>();
        map.put("name","我爱你");
        List<User> users = userMapper.selectByMap(map);
        users.forEach(System.out::println);
    }

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