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Accessing data in JSON Objects within DataMiner schema's
Through the database schema's page ("<appliance url>/dm/schema") it is possible to see the various tables and fields that can be queried. In certain cases it is possible that the table contain JSON objects identified as "jsonb" type fields. These are collections of additional fields.
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To see what is contained in such an object in your DataMiner query use:
SELECT
library_properties::TEXT
FROM
cqx_data.file_library
With the text in red being the object and table names. This will show all columns & values in the object as a single string.
The result would then look like:
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Alternatively you can also run:
SELECT
*
FROM
cqx_data.file_library
But not run it as grid but as JSON.
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This will show the properties field in a JSON format in most browsers.
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Once you know what is in the object you can also retrieve individual elements from it. To get an individual column from the object use the "->>" operator:
SELECT
library_properties ->> 'size' AS lib_size
FROM
cqx_data.file_library

With the text in red being: The object name, the item name (in the object) and the table name. To determine the item name use the first option to see what items are contained within the JSON object.
Nested JSON OBJECTS:
In some cases the JSON objects can also hold JSON objects themselves (nested objects). These can be identified because the text that appears on running an <OBJECT>::TEXT will have the following structure:
{"<NESTED OBJECT NAME1>":{"COLUMN NAME 1": <value>, "COLUMN NAME 2": <value>, … etc}, {"<NESTED OBJECT NAME2>":{"COLUMN NAME 1": <value>, "COLUMN NAME 2": <value>, … etc}, … etc}
Example:
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Or:
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To access elements of the nested elements you first need to get to the nested object itself and identify what information you want to get.

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In the above screenprint we see for instance that "Communities" is a nested object from the "applications" object in the "cqx_data.community_activity_applications" table that contains a field called "user_count". To get the specific user_count of community activity I therefor first need to access the "Applications" object to get to the "Communities" object to then retrieve the specific "user_count" field value.
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This can be done in two ways by either using a sub select:
SELECT
split_communities_object ->> 'user_count' as user_count_communities,
*
FROM
(SELECT
*,
applications -> 'Communities' AS split_communities_object
FROM
cqx_data.community_activity_applications
) splitObject

Or by splitting it all in one go (more direct option):
SELECT
applications -> 'Communities' ->> 'user_count' as user_count_communities,
*
FROM
cqx_data.community_activity_applications
The result in both cases is:
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In the example I only lifted out one column from the application object, you can of course add multiple.

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