Mysql Rewrite Column with JSON Array - mysql

Question

I want to write an MySQL Query where I replace a JSON Array with Data from another Table.
I have got two Tables, "Reserved" and "Seats". Reserved contains one column "Seats", an JSON Array referring to the ID of the Table "Seats". Table Seats also contains a column "Name". I now want to basically replace the IDs in the JSON Data of the Seats column of the Reserved Table, with the name of the corresponding IDs stored in the Seats Table.
Is there a way to do this in an Mysql Query. I do not know how to pack a query result in a JSON Format and return it as a column
I already tried to utilize JSON_EXTRACT somehow : see test below.
SELECT * FROM `seats` WHERE ID = JSON_EXTRACT('["276", "277", "278"]','$.*')
Basically I want a Query like this:
SELECT *,
JSONCreate(SELECT name from `seats` WHERE seats.id IN JSON_EXTRACT(reserved.seats)) as name
FROM `reserved`
WHERE 1

Answer 1

You can use one of the following solutions.
solution using JSON_SEARCH and JSON_ARRAYAGG
SELECT r.seats, JSON_ARRAYAGG(s.name)
FROM reserved r JOIN seats s ON JSON_SEARCH(r.seats, 'one', CONVERT(s.id, CHAR(10))) IS NOT NULL
GROUP BY r.seats
solution using ... MEMBER OF () and JSON_ARRAYAGG
SELECT r.seats, JSON_ARRAYAGG(s.name)
FROM reserved r INNER JOIN seats s ON CONVERT(s.id, CHAR) MEMBER OF(r.seats)
GROUP BY r.seats
solution using JSON_CONTAINS and JSON_ARRAYAGG
SELECT r.seats, JSON_ARRAYAGG(s.name)
FROM reserved r INNER JOIN seats s ON JSON_CONTAINS(r.seats, JSON_QUOTE(CONVERT(s.id, CHAR))) = 1
GROUP BY r.seats
You can also use JSON_TABLE to solve this:
SELECT JSON_ARRAYAGG(IFNULL(s.name, ''))
FROM reserved r, JSON_TABLE(
r.seats,
"$[*]" COLUMNS (
id CHAR(50) PATH "$"
)
) AS rr LEFT JOIN seats s ON rr.id = s.id
GROUP BY r.seats
Note: You can use INNER JOIN to remove the empty values. Instead of GROUP BY r.seats you should use a id column.
demo on dbfiddle.uk