Hyperledger Composer How to query using string

Question

I have a structure defined like that:

concept Data
{
  o Double Temp
  o Double Hum
}

asset Reading identified by ReadingID
{
    o String ReadingID
    o String DeviceID
    o Integer Time
    o Data Data
}

In Composer, I can search for ReadingID without coding anything, because it is the "primary key" and this query is automatically defined.

Is there a way for querying using basic types, like a String?

Answer 1

You can try this:

query selectReading {
  description: "my query"
  statement:
      SELECT org.acme.biznet.Reading
          WHERE (DeviceID ==_$device_id)
}


return query('selectReading', {device_id: device} )
// return query('selectReading', {device_id: '1234567'} )
        .then(function (results) {


           for (var n = 0; n < results.length; n++) {
            // process array of results
           }
       });