Query on a list of json in Mysql 5.6 - mysql

Question

I am using mysql 5.6 and it will not be feasible for me to upgrade it to 5.7. I have a table which stores json as an attribute. Attaching screenshot for reference.
Here, the column policy_status contains status and values of different policies as json for each user.
How can I find the list of users, say, with appVersion' status as success and value = 1437.
I got a few references online but as I am new to stored procedures I am not able to reach a solution. I will appreciate any help. Thanks in advance.

Answer 1

It is not efficient at all but may can help you with ideas:
SELECT *
FROM data
WHERE
(LOCATE('"employmentType":["status":"success"]', policy_status) > 0
AND
LOCATE('"value": 1', policy_status) > 0);
Using the LOCATE function you can see whether the field contains your desired appVersion and value strings. See sqlfiddle demo here.
Where the simple test data:
CREATE TABLE data (
id INT UNSIGNED NOT NULL,
policy_status TEXT
);
INSERT INTO data (id, policy_status) VALUES
(1,'{"employmentType":["status":"success"], "value": 1}'),
(2,'{"employmentType":["status":"no"], "value": 1}'),
(3,'{"employmentType":["status":"no"], "value": 0}'),
(4,'{"employmentType":["status":"success"], "value": 0}'),
(5,'{"employmentType":["status":"no"], "value": 1}');
gives the result:
{"employmentType":["status":"success"], "value": 1}
Where both strings are found.
UPDATE:
Also if you can add FULLTEXT index for your policy_status column than you can use fulltext search in the WHERE clause:
...
WHERE
MATCH (policy_status) AGAINST ('+"employmentType:[status:success]" +"value: 1"' IN BOOLEAN MODE)
Note the + and " characters in AGAINST(...). They are special boolean full-text search operators. See here.
A leading or trailing plus sign indicates that this word must be
present in each row that is returned
and
A phrase that is enclosed within double quote (") characters matches
only rows that contain the phrase literally, as it was typed. The
full-text engine splits the phrase into words and performs a search in
the FULLTEXT index for the words. Nonword characters need not be
matched exactly.
If it is not an option in your case, you can use LIKE for matching the substrings:
...
WHERE
(policy_status LIKE '%"employmentType":["status":"success"]%'
AND
policy_status LIKE '%"value": 1%');
See sqlfiddle demo for both.