MySQL - Split Delimited Right and Left Values - mysql

Question

I have a case where I will get input for products and their values separated with a delimited special character. Using this string I need to separate products and their values to MySQL Rows like below.
Input:
{"1301":29.00,"1302":25.01,"1306":50.09,"1678":100.00}
Output:
Product ID Value
1301 29.00
1302 25.01
1306 50.09
1678 100.00
Here the products Id counts are dynamic, we can get n count every time. Please help me getting the above output in MySQL.

Answer 1

MySQL only solution with JSON functions.
Query
SELECT
TRIM(REPLACE(
SUBSTRING_INDEX(
SUBSTRING_INDEX(json_parsed, ',', number_generator.number)
, ','
, -1
)
, '"'
, ''
)) AS 'Product ID'
, JSON_EXTRACT(json, CONCAT('$.', SUBSTRING_INDEX(
SUBSTRING_INDEX(json_parsed, ',', number_generator.number)
, ','
, -1
))) AS 'Value'
FROM (
SELECT
#row := #row + 1 AS number
FROM (
SELECT 0 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9
) row1
CROSS JOIN (
SELECT 0 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9
) row2
CROSS JOIN (
SELECT #row := 0
) init_user_params
) AS number_generator
CROSS JOIN (
SELECT
SUBSTRING(json_keys, 2, json_keys_length - 2) AS json_parsed
, json_keys
, json
, JSON_LENGTH(json_keys) AS json_array_length
FROM (
SELECT
JSON_KEYS(record.json) AS json_keys
, json
, LENGTH(JSON_KEYS(record.json)) AS json_keys_length
FROM (
SELECT
'{"1301":29.00,"1302":25.01,"1306":50.09,"1678":100.00}' AS json
FROM
DUAL
) AS record
) AS json_information
) AS json_init
WHERE
number_generator.number BETWEEN 0 AND json_array_length
Result
| Product ID | Value |
| ---------- | ----- |
| 1301 | 29.0 |
| 1302 | 25.01 |
| 1306 | 50.09 |
| 1678 | 100.0 |
see demo

Answer 2

You really should be treating this like JSON, but you can use brute-force string methods. Here is one method:
select replace(substring_index(str, ':', 1), '"', '') as product_id, substring_index(str, ':', -1) as value
from (select replace(replace(substring_index(#x, ',', 1), '{', ''), '}', '') as str) x
union all
select replace(substring_index(str, ':', 1), '"', '') as product_id, substring_index(str, ':', -1) as value
from (select replace(replace(substring_index(substring_index(#x, ',', 2), ',', -1), '{', ''), '}', '') as str) x
union all
select replace(substring_index(str, ':', 1), '"', '') as product_id, substring_index(str, ':', -1) as value
from (select replace(replace(substring_index(substring_index(#x, ',', 3), ',', -1), '{', ''), '}', '') as str) x
union all
select replace(substring_index(str, ':', 1), '"', '') as product_id, substring_index(str, ':', -1) as value
from (select replace(replace(substring_index(substring_index(#x, ',', 4), ',', -1), '{', ''), '}', '') as str) x;
along with a db<>fiddle.