从uknknown数组键中提取JSON

Question

I have a structure - column visitors

[{"firstname":"john","lastname":"penn"},{"firstname":"mickey","lastname":"smith"},{"firstname":"darth","lastname":"vader"}]

I would like to find out if there is a john among all these people listed inside this json.

My quers does not find anything (no rows found)

SELECT conference_name FROM conference WHERE JSON_EXTRACT(visitors, "$[*].firstname") = 'john';

Is this possible to achieve using just json_extract and NOT json_search since it is very slow with big tables?

Answer 1

Like mentioned in the docs :

mysql> SELECT c, JSON_EXTRACT(c, "$.firstname"), g
 > FROM jemp
 > WHERE JSON_EXTRACT(c, "$.firstname") = 'john';

or in your case you can try

SELECT conference_name FROM conference WHERE JSON_EXTRACT(visitors, "$.firstname") = 'john';

or ?

SELECT conference.conference_name FROM conference WHERE JSON_EXTRACT(conference.visitors, "$.firstname") = 'john';