Chaining JSON_EXTRACT with CAST or STR_TO_DATE fails

Question

I\'m trying to extract a datetime from a JSONFIELD \"data\" in MySQL.

If I do a simple JSON_EXTRACT however, the return field type is a JSON.

mysql&g         


        

Answer 1

You have to use JSON_UNQUOTE

select CAST( JSON_UNQUOTE( JSON_EXTRACT(data, "$.new_time")) as DATETIME) from analytics_calendaranalytics limit 10;

Would work. I am saying would because you haven't provided sample data. I tried as follows:

select @js := JSON_OBJECT('new_time',"2016-09-30T04:00:00+00:00"  );

select CAST(JSON_UNQUOTE(JSON_EXTRACT(@js,'$.new_time')) as DATETIME);

The following query also works

 select STR_TO_DATE(JSON_UNQUOTE(JSON_EXTRACT(@js,'$.new_time')) ,"%Y-%m-%d");