[Python]PostgreSQL字典/JSON类型递归自展开
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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | 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
1 2 3 4 5 6 7 8 | # 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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 | 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" } } ] } |
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