更新数据库树结构的level和code列

update_tree_data_code_column.sql

-- 初始化
update tjyqhdmhcxhfdm set level = -1, code = '';
update tjyqhdmhcxhfdm set level = 0, code = concat(parentId, ',', id, ',') where parentId = 0;

-- 查询
select * from tjyqhdmhcxhfdm_2017 where level >= 0 order by level asc, parentId asc, code asc limit 1000;

-- 更新
update 
		tjyqhdmhcxhfdm t1 inner join tjyqhdmhcxhfdm_2017 t2 on t1.parentId = t2.id 
set 
		t1.level = t2.level + 1,
		t1.code = concat(t2.code, t1.id, ',')
where t2.level = 0;