AWS IoT规则JSON密钥上的SQL查询以数字开头

Question

I've been at this for a few hours and can't figure it out. So I thought maybe someone here would have an idea.

I have JSON which is being published to a thing shadow(format of JSON being posted is not under my control). The JSON looks like this:

{"state":{"reported":{"0013A20011223344":{"input_1":1}}}}

I tried this query statement which would be used to send a publish to SNS:

SELECT "input closed" AS default FROM "$aws/things/Cell_Test_Thing/shadow/update" WHERE state.reported.0013A200418C5535.input_1 = 1

The problem is the SQL query does not like that key starting with a 0. I determined this by replacing 0013... with device here and it worked perfectly:

SELECT "input closed" AS default FROM "$aws/things/Cell_Test_Thing/shadow/update" WHERE state.reported.device.input_1 = 1

So the problem is that JSON key beginning with a number. If I change device to device0 it works but if you change it to 0device it fails. From what I can determine it is perfectly valid to start a JSON key with a number so hopefully there is a work around for this.

Ideas?

Answer 1

Try this:

SELECT "input closed" AS default 
FROM "$aws/things/Cell_Test_Thing/shadow/update" 
WHERE "state"."reported"."0013A200418C5535"."input_1" = 1

Each part of the name must be in quotes. This is because the name has a structure in four parts.

Why can't you just use one set of quotes? Think about it this way. The four-part name "state"."reported"."0013A200418C5535"."input_1" has four parts, separated by dots. But what if one of those parts had a dot in it?

(Technically only parts which contain certain characters need to be quoted, but sometimes it's easier just to do them all).