[IOTDB-163] Support create device template and create device.

• Type: Improvement
• Status: Closed
• Priority: Trivial
• Resolution: Fixed
• Labels: medium pull-request-available
• Assignee: Unassigned
• Reporter: Tian Jiang
• Created: 14/Aug/19 02:22
• Updated: 26/Apr/21 09:34
• Resolved: 26/Apr/21 09:34

Description

In the present version, it is a little trouble some to create a set timeseries that has the same measurements. On the other hand, although we use the conception "device" in the code, it is not properly abstracted.

Expected usage:

Using IoTDB in a more relational way:

CREATE DEVICE TEMPLATE vehicle (speed DOUBLE PLAIN, direction DOUBLE PLAIN, temperature DOUBLE PLAIN, fuel DOUBLE PLAIN)

If all datatypes(or encodings) are the same, you can write the equal form:

CREATE DEVICE TEMPLATE vehicle MEASUREMENTS (speed, direction, temperature, fuel) DATATYPE DOUBLE ENCODING PLAIN

Then you will be able to create time series in an easier way:

CREATE DEVICE (vehicle) root.sg1.vehicle1

Which equals:

CREATE TIMESERIES root.sg1.vehicle1.speed WITH DATATYPE=DOUBLE,ENCODING=PLAIN

CREATE TIMESERIES root.sg1.vehicle1.direction WITH DATATYPE=DOUBLE,ENCODING=PLAIN

CREATE TIMESERIES root.sg1.vehicle1.fuel WITH DATATYPE=DOUBLE,ENCODING=PLAIN

CREATE TIMESERIES root.sg1.vehicle1.temperature WITH DATATYPE=DOUBLE,ENCODING=PLAIN

I ** hope this will narrow the gap of using IoTDB and traditional relation databases.

Issue Links

• duplicates: IOTDB-1200 Support device template
• links to: GitHub Pull Request #527