SQL Server and JSON – JSON AUTO

We’ll seen how to get JSON data from a file and how to insert JSON directly into a table.

But how do take data from our SQL Server queries and turn that data into valid JSON?

Turns out that we have a few options – and we’ll look at some right now.

FOR JSON Auto

And it’s actually quite simple, all we need to do is place FOR JSON AUTO on the very end of our T-SQL statement

USE [tempdb];
GO

SELECT 
	 C.configuration_id
	,[Configuration name]  = C.[name]
	,[Configuration Value] = C.[value]
	,C.minimum
	,C.maximum
	,C.value_in_use
	,C.[description]
	,C.is_dynamic
	,C.is_advanced
FROM 
	sys.configurations AS C
ORDER BY
	C.configuration_id
FOR JSON AUTO;

Notice that we have aliased the columns “name” to “Configuration name” and “value” to “Configuration Value” – both of which can be seen from the JSON produced.

[
  {
    "configuration_id": 101,
    "Configuration name": "recovery interval (min)",
    "Configuration Value": 0,
    "minimum": 0,
    "maximum": 32767,
    "value_in_use": 0,
    "description": "Maximum recovery interval in minutes",
    "is_dynamic": true,
    "is_advanced": true
  },
  {
    "configuration_id": 102,
    "Configuration name": "allow updates",
    "Configuration Value": 0,
    "minimum": 0,
    "maximum": 1,
    "value_in_use": 0,
    "description": "Allow updates to system tables",
    "is_dynamic": true,
    "is_advanced": false
  }
]

We can do something a something a touch more complex. Let’s see how many dynamic values we have on our instance

SELECT 
     [is_dynamic] = 
	 CASE
		WHEN C.is_dynamic = 0 THEN 'No'
		ELSE 'YES'
	 END
	,[Count] = COUNT(*)
FROM 
	sys.configurations AS C
GROUP BY
	C.is_dynamic
ORDER BY
	[is_dynamic]
FOR JSON AUTO;

Which will give us the JSON below

[
  {
    "is_dynamic": "No",
    "Count": 17
  },
  {
    "is_dynamic": "YES",
    "Count": 66
  }
]

And that’s all there really is too it.

We’ll have a look at something a bit flexible in the next instalment.

I hope this has helped on your SQL Server JSON journey. We’ll see more real soon.

Have a great day

Cheers

Marty

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SQL Server and JSON – JSON Auto

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