Postgres 将假期测试解析为 table

Question

我有一个 table 存储配置，我需要在查询中使用它们。起始 table 的值存储为以下文本：

---
'1':
  '1': New Year's Day
  '6': Epiphany
'11':
  '1': All the Saints
'12':
  '24': Christmas Eve
  '25': First Christmas Day
  '26': Second Christmas Day
  '31': New Year's Eve
'5':
  '1': International Workers' Day
'8':
  '15': Mid-August

例如，在第二行中，我有月份，在第三行结束时有两个 space 缩进，我有日期及其描述，用冒号分隔。

我想把它放在像这样的 table 中：

id	description	month	day
1	New Year's Day	1	1

我放了一个example in db<>fiddle.

Answer 1

更多黑暗正则表达式魔法将文本数据转换为 json 格式。
这样就可以通过 json 方法提取数据。

INSERT INTO holidays (holiday,description)
select 
  make_date(2018, l2.Month, l2.Day) as holiday
, l2.Name as description
from test
cross join lateral (
  select 
  regexp_replace(
   regexp_replace(
    regexp_replace(
     regexp_replace(wh, 
      '^\W+(\d+)\W+(\w.*)$',' {"day":"","name":""},','gm')
    , '^''(\d+)'':', '{"month":"","days":[','gm')
    , '\},(\s*)(?=\{"month"|$)', '}]},','g')
    , '^.*?(\{.*\}).*$', '[]')::json as whjs
) l1
cross join lateral (
  select 
    (mjs.value->>'month')::int as Month
  , (djs.value->>'day'):: int as Day
  , djs.value->>'name' as Name
  from json_array_elements(l1.whjs) mjs
  cross join lateral json_array_elements(mjs.value->'days') djs
) l2

9 rows affected

select * from holidays;

id description holiday

1 New Year's Day 2018-01-01

2 Epiphany 2018-01-06

3 All the Saints 2018-11-01

4 Christmas Eve 2018-12-24

5 First Christmas Day 2018-12-25

6 Second Christmas Day 2018-12-26

7 New Year's Eve 2018-12-31

8 International Workers' Day 2018-05-01

9 Mid-August 2018-08-15

在 db<>fiddle here

上测试

Postgres 将假期测试解析为 table

Postgres parse vacation days test to table

regex

postgresql

parsing

id	description	holiday
1	New Year's Day	2018-01-01
2	Epiphany	2018-01-06
3	All the Saints	2018-11-01
4	Christmas Eve	2018-12-24
5	First Christmas Day	2018-12-25
6	Second Christmas Day	2018-12-26
7	New Year's Eve	2018-12-31
8	International Workers' Day	2018-05-01
9	Mid-August	2018-08-15