PostgreSql 习惯上会将特殊数据类型的各个节点按字典/JSON类型存储
程序中需要获得完整的数据信息的时候,需要对这个节点进行自展开。
以下使用global id方式进行展开,一般适用于SQL+NoSQL结合的系统使用
import sys, os
import numpy as np
def get_object_by_gid(id):
for dict in data["json"]:
if dict["gid"] == id:
return dict.copy()
def self_exact_node(key):
dict = get_object_by_gid(key)
for k,v in dict.items():
if k == "sub_item" :
item_arr = []
for id in v["gids"]:
item_arr.append(self_exact_node(id))
v["item_arr"] = item_arr.copy()
return dict
def demo():
data_exact = data.copy()
for d in data_exact["json"]:
d = self_exact_node(d["gid"])
def main():
demo()
if __name__ == '__main__’:
sys.exit(main())
其他玩法
# Global ID方式
"gid": "大分类2:中分类2:子分类2",
# 复合ID
"id":{"l1_cat":"大分类1","l2_cat":"中分类2","l3_cat":"子分类2"}
# 链表式
"chain":{"next_gid":"","pre_gid":"","head_gid":"","tail_gid":""}
# 二叉树式
"btree":{"next_sibling":"","child":”"}
测试用数据
data = {
"json": [{
"gid": "大分类1",
"sub_item": {
"gids": ["大分类1:中分类1", "大分类1:中分类2"]
},
"values": {
"k1": "1000"
}
},
{
"gid": "大分类2",
"sub_item": {
"gids": ["大分类2:中分类1", "大分类2:中分类2"]
},
"values": {
"k1": "2000"
}
},
{
"gid": "大分类1:中分类1",
"sub_item": {
"gids": ["大分类1:中分类1:子分类1", "大分类1:中分类1:子分类2"]
},
"values": {
"k1": "1100"
}
},
{
"gid": "大分类1:中分类2",
"sub_item": {
"gids": ["大分类1:中分类1:子分类1", "大分类1:中分类1:子分类2"]
},
"values": {
"k1": "1200"
}
},
{
"gid": "大分类2:中分类1",
"sub_item": {
"gids": ["大分类2:中分类1:子分类1", "大分类2:中分类1:子分类2"]
},
"values": {
"k1": "2100"
}
},
{
"gid": "大分类2:中分类2",
"sub_item": {
"gids": ["大分类2:中分类2:子分类1", "大分类2:中分类2:子分类2"]
},
"values": {
"k1": "2200"
}
},
{
"gid": "大分类1:中分类1:子分类1",
"sub_item": {
"gids": []
},
"values": {
"k1": "1110"
}
},
{
"gid": "大分类1:中分类1:子分类2",
"sub_item": {
"gids": []
},
"values": {
"k1": "1120"
}
},
{
"gid": "大分类1:中分类2:子分类1",
"sub_item": {
"gids": []
},
"values": {
"k1": "1210"
}
},
{
"gid": "大分类1:中分类2:子分类2",
"sub_item": {
"gids": []
},
"values": {
"k1": "1220"
}
},
{
"gid": "大分类2:中分类1:子分类1",
"sub_item": {
"gids": []
},
"values": {
"k1": "2110"
}
},
{
"gid": "大分类2:中分类1:子分类2",
"sub_item": {
"gids": []
},
"values": {
"k1": "2120"
}
},
{
"gid": "大分类2:中分类2:子分类1",
"sub_item": {
"gids": []
},
"values": {
"k1": "2210"
}
},
{
"gid": "大分类2:中分类2:子分类2",
"id":{"l1_cat":"大分类1","l2_cat":"","l3_cat":""}
"sub_item": {
"gids": []
},
"values": {
"k1": "2220"
}
},
{
"gid": "大分类2:中分类2:子分类2",
/*复合ID*/
"id":{"l1_cat":"大分类1","l2_cat":"中分类2","l3_cat":"子分类2"}
/*链表式*/
"chain":{"next_gid":"","pre_gid":"","head_gid":"","tail_gid":""}
/*二叉树式*/
"btree":{"next_sibling":"","child":""}
"sub_item": {
"gids": []
},
"values": {
"k1": "2220"
}
}
]
}