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Find WebId after point creation

Question asked by ovenyg on Jul 9, 2019
Latest reply on Jul 10, 2019 by ovenyg

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Hi,

I'm using the Web API to create lab points as they arrive in our lims. This is working fine even though not all attributes may be set in the same API call.

Now I like to change some attributes (limits etc) after the point is created. However, I can't use the 'search" controller as it seems to only query the crawled data (https://myserver/search/query?q=mytag) so can't get back the WebId, which I need to issue an UpdateAttributeValue. If I wait a while until the next crawl cycle has finished I can get the WebID but that doesn't seem like a solution.

The question is, how to get the newly created point's WebId shortly after it is created?

Is there any way to bypass the index or use any other means of search?

Thanks!

rschmitz

Jul 9, 2019 7:34 PM

Correct Answer

Hi Ove,

The PI Web API conveniently returns the location of the point after creating it in the responses header. So if you unwrap the 201 response you'll see the below (I've redacted out part of the WebId and the Authentication) and one of the accessible parameters is the URL for accessing the point you just created.

HTTP/1.1 201 Created
Content-Length: 0
Location: https://hostnmame/piwebapi/points/F1DP...
Server: Microsoft-HTTPAPI/2.0
X-Frame-Options: SAMEORIGIN
WWW-Authenticate: [REDACTED]
Date: Tue, 09 Jul 2019 19:31:32 GMT

Cheers,

Rob

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rschmitz

Jul 9, 2019 7:34 PM

Hi Ove,

Cheers,

Rob

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rschmitz

@ rschmitz on Jul 9, 2019 7:41 PM

I'm also going to add onto this for completion's sake - yes, there is another way to search in the PI Web API and that's with either:

AFSearch - only for AF Objects, but is generally the preferred method for searching
- Also a link to the online course video for this to jump-start you
GetByPath calls - valid for both PI and AF Objects
- Requires know the full path to the object, which in your case of creating points you should
Using PI Web API's Core Filtering Functionality, which varies a bit from controller to controller and action to action, but in the case of points you can search on a name filter if you have the WebId for the Data Server (which you can get via a GetByPath call)

--Rob

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ovenyg @ rschmitz on Jul 10, 2019 12:03 PM

Thanks! That was what I was looking for!

Now that you mentioned the response header, I noticed that it was mentioned in the help files aswell which I missed

Ove

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rschmitz Jul 9, 2019 7:34 PM
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Correct Answer
Hi Ove,

The PI Web API conveniently returns the location of the point after creating it in the responses header. So if you unwrap the 201 response you'll see the below (I've redacted out part of the WebId and the Authentication) and one of the accessible parameters is the URL for accessing the point you just created.

HTTP/1.1 201 Created
Content-Length: 0
Location: https://hostnmame/piwebapi/points/F1DP...
Server: Microsoft-HTTPAPI/2.0
X-Frame-Options: SAMEORIGIN
WWW-Authenticate: [REDACTED]
Date: Tue, 09 Jul 2019 19:31:32 GMT

Cheers,
Rob
2 people found this helpful
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- rschmitz @ rschmitz on Jul 9, 2019 7:41 PM
  Mark Correct
  Correct Answer
  I'm also going to add onto this for completion's sake - yes, there is another way to search in the PI Web API and that's with either:
  AFSearch - only for AF Objects, but is generally the preferred method for searching
  Also a link to the online course video for this to jump-start you
  GetByPath calls - valid for both PI and AF Objects
  Requires know the full path to the object, which in your case of creating points you should
  Using PI Web API's Core Filtering Functionality, which varies a bit from controller to controller and action to action, but in the case of points you can search on a name filter if you have the WebId for the Data Server (which you can get via a GetByPath call)
  
  --Rob
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- ovenyg @ rschmitz on Jul 10, 2019 12:03 PM
  Mark Correct
  Correct Answer
  Thanks! That was what I was looking for!
  Now that you mentioned the response header, I noticed that it was mentioned in the help files aswell which I missed
  
  BR
  Ove
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