SQL Server 2016 for JSON output integer array

Question

I\'d like to get JSON with an array of integers using SQL Server 2016\'s For JSON feature. I\'m stumped on array of integers.

Database table structures:

Answer 1

In AdventureWorks 2016 CTP3 JSON sample you can find a function that can clean array of key:value pairs and create array od values:

DROP FUNCTION IF EXISTS dbo.ufnToRawJsonArray
GO
CREATE FUNCTION
[dbo].[ufnToRawJsonArray](@json nvarchar(max), @key nvarchar(400)) returns nvarchar(max)
AS BEGIN
       declare @new nvarchar(max) = replace(@json, CONCAT('},{"', @key,'":'),',')
       return '[' + substring(@new, 1 + (LEN(@key)+5), LEN(@new) -2 - (LEN(@key)+5)) + ']'
END

Just provide result of your SELECT FOR JSON expression as @json parameter and name of the key that you want to remove as second parameter. Probably something like:

select
e.Name as Employee,
JSON_QUERY(dbo.ufnToRawJsonArray(
    (select 
     convert(nvarchar(10),ep.PermissionID) as PermID 
     from @EmployeePermissions ep 
     where ep.EmployeeID=e.ID 
     for json path)
  , 'PermID'))
   as 'Permissions'
from
@Employees e
for json path, root('EmployeePermissions')