Mybatis新增save结束后自动返回主键id

女爷i 2023-06-12 04:20 24阅读 0赞

# 1.使用场景 #

save操作之前实体类中id为null，save之后自动返回带id的实体类

@Override
        public ChartPagePanel save(ChartPagePanel entity) { 
            UserDetails user = SecurityContextHolder.getUserDetails();
            entity.setCreateUser(user.getUsername());
            entity.setLastModifyUser(user.getUsername());
            //entity中的id为null
            chartPagePanelMapper.save(entity);
            //经过save操作后自动返回带id的entity
            // savePanelManage(entity); 其中的entity带有id
            savePanelManage(entity);
            return entity;
        }
    
        @Transactional
        public void savePanelManage(ChartPagePanel entity){ 
            if(entity.getChartPageManges()!=null && entity.getChartPageManges().size()>0) { 
                Map<String, Object> map = new HashMap<>();
                for (int i = 0; i < entity.getChartPageManges().size(); i++) { 
                    int manageId = entity.getChartPageManges().get(i).getId();
                    map.put("manageId", manageId);
                    map.put("panelId", entity.getId());
                    chartPagePanelManageMapper.save(map);
                }
            }
        }

# 2.原理在Mybatis配置了*useGeneratedKeys=“true”* *keyProperty=“id”* #

<insert id="save" parameterType="com.centrin.generator.entity.ChartPagePanel" useGeneratedKeys="true" keyProperty="id">
    	insert into chart_page_panel
    	(
            `parent_id`,
            `position`,
            `name`,
            `create_time`,
            `create_user`,
            `last_modify_time`,
            `last_modify_user`
            )
    	values (
    		#{ parentId},
    		#{ position},
    		#{ name},
    		NOW(),
    		#{ createUser},
    		NOW(),
    		#{ lastModifyUser}
    		)
      </insert>