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>