How to search JSON array in MySQL?

Question

Let\'s say I have a JSON column named data in some MySQL table, and this column is a single array. So, for example, data may contain:

Answer 1

Since MySQL 8 there is a new function called JSON_TABLE.

CREATE TABLE my_table (id INT, data JSON);

INSERT INTO my_table VALUES 
  (1, "[1,2,3,4,5]"), 
  (2, "[0,1,2]"), 
  (3, "[3,4,-10]"), 
  (4, "[-1,-2,0]");

SELECT DISTINCT my_table.* 
FROM my_table, JSON_TABLE(data, "$[*]" COLUMNS(nr INT PATH '$')) as ids 
WHERE ids.nr > 2;

+------+-----------------+
| id   | data            |
+------+-----------------+
|    1 | [1, 2, 3, 4, 5] |
|    3 | [3, 4, -10]     |
+------+-----------------+
2 rows in set (0.00 sec)

Answer 2

You can use JSON extract to search and select data

SELECT data, data->"$.id" as selectdata
FROM table
WHERE JSON_EXTRACT(data, "$.id") = '123'
#ORDER BY c->"$.name";
limit 10 ;

Answer 3

I have similar problem, search via function

create function searchGT(threshold int, d JSON)
returns int
    begin
        set @i = 0;
        while @i < json_length(d) do
            if json_extract(d, CONCAT('$[', @i, ']')) > threshold then
                return json_extract(d, CONCAT('$[', @i, ']'));
            end if;
            set @i = @i + 1;
        end while;
        return null;
    end;

select searchGT(3, CAST('[1,10,20]' AS JSON));

Answer 4

You may search an array of integers as follows:

  JSON_CONTAINS('[1,2,3,4,5]','7','$') Returns: 0
  JSON_CONTAINS('[1,2,3,4,5]','1','$') Returns: 1

You may search an array of strings as follows:

  JSON_CONTAINS('["a","2","c","4","x"]','"x"','$') Returns: 1
  JSON_CONTAINS('["1","2","3","4","5"]','"7"','$') Returns: 0

Note: JSON_CONTAINS returns either 1 or 0

In your case you may search using a query like so:

SELECT * from my_table
WHERE JSON_CONTAINS(data, '2', '$');

Answer 5

A possible way is to deal with the problem as string matching. Convert the JSON to string and match.

Or you can use JSON_CONTAINS.

Answer 6

I don't know if we found the solution. I found with MariaDB a way, to search path in a array. For example, in array [{"id":1}, {"id":2}], I want find path with id equal to 2.

SELECT JSON_SEARCH('name_field', 'one', 2, null, '$[*].id')
FROM name_table

The result is:

"$[1].id"

The asterisk indicate searching the entire array