The format stored when you upload data JSON data using REST is the same format
you get when using
xdmp:transform-from-json( "{ json data} " )
If you want to turn that back into JSON use
xdmp:transform-to-json( < xml data from database > )
If you want to augment the data which is stored in the DB with your own JSON
you can use instead
xdmp:transform-to-json-object( < xml data from database > )
Which will produce a json:object
>From there you can add to this object and then finally use
json:to-json( json object )
to generate the actual JSON as a string
Is this what you were after ?
If not could you provide some more details on exactly what you are trying to
accomplish ?
-----------------------------------------------------------------------------
David Lee
Lead Engineer
MarkLogic Corporation
[email protected]
Phone: +1 812-482-5224
Cell: +1 812-630-7622
www.marklogic.com<http://www.marklogic.com/>
From: [email protected]
[mailto:[email protected]] On Behalf Of Steve Spigarelli
Sent: Monday, July 22, 2013 3:22 PM
To: MarkLogic Developer Discussion
Subject: Re: [MarkLogic Dev General] json:object
Thank you for your responses.
I'm trying to write a REST extension that can create a JSON object with some
objects previously uploaded using the REST interface.
What I see to be the problem is that the REST interface translates the JSON
into one format, and the json:map and json:array functions generate completely
different internal XML structures. The files ingested with the REST interface
require json:transform-to-json and json:map and json:array require xdmp:to-json
to translate from XML to JSON.
Starting with JSON of {"hello": "world"} I see the following:
REST Interface (after upload):
<json type="object" xmlns="http://marklogic.com/xdmp/json/basic";>
<hello type="string">world</hello>
</json>
and using json:object() I get:
json:object(
<json:object xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:json="http://marklogic.com/xdmp/json";>
<entry key="hello">
<json:value xsi:type="xs:string">world</json:value>
</entry>
</json:object>
)
I would expect them to be the same. Is there a way to convert from one to the
other?
Thanks
Steve
--
Steve
On Mon, Jul 22, 2013 at 12:47 PM, Danny Sokolsky
<[email protected]<mailto:[email protected]>> wrote:
You can try looking through this section of the doc for a little more info too:
http://docs.marklogic.com/guide/app-dev/json
-Danny
From:
[email protected]<mailto:[email protected]>
[mailto:[email protected]<mailto:[email protected]>]
On Behalf Of David Lee
Sent: Monday, July 22, 2013 11:44 AM
To: MarkLogic Developer Discussion
Subject: Re: [MarkLogic Dev General] json:object
json:object is the in-memory representation of maps used for json.
The only difference between map:map and json:object is that the keys are
ordered (which actually is not something JSON guarentees ... but we do).
Your "magic function" is xdmp:to-json().
You dont do a transformation on json:object TO JSON ... its already in the
form needed ... You can turn it into a JSON string using xdmp:to-json() but
thats not a transformation.
Transformations occur between XML <-> JSON
Did that answer your question ?
-----------------------------------------------------------------------------
David Lee
Lead Engineer
MarkLogic Corporation
[email protected]<mailto:[email protected]>
Phone: +1 812-482-5224<tel:%2B1%20812-482-5224>
Cell: +1 812-630-7622<tel:%2B1%20812-630-7622>
www.marklogic.com<http://www.marklogic.com/>
From:
[email protected]<mailto:[email protected]>
[mailto:[email protected]<mailto:[email protected]>]
On Behalf Of Steve Spigarelli
Sent: Monday, July 22, 2013 2:39 PM
To: [email protected]<mailto:[email protected]>
Subject: [MarkLogic Dev General] json:object
I'm having a difficult time understanding what good the json:object() function
is. From what I can tell after using it, it is a specialized map:map object. I
have tried using json:transform-to-json on the object but the transform
function doesn't like that.
So, what is the proper way to create a json:object and receive back the actual
JSON string?
For example:
let $json-obj := json:object()
let $_ := map:put($json-obj, "key", "value")
return magic-function($json-obj) which would return {"key": "value"}
What I get instead by calling json:transform-to-json($json-obj) is an invalid
coercion error. Even wrapping the object and passing the node doesn't work.
Any ideas? Has anyone actually used this function? From the comments in the
documentation it doesn't have many comments.
(http://docs.marklogic.com/json:transform-to-json)
--
Steve
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