(SQL Server) JSON: Miscellaneous Operations

Demonstrates a variety of JSON API methods. This example uses the following JSON document:

{
   "alphabet": "abcdefghijklmnopqrstuvwxyz",
   "sampleData" : {
           "pi": 3.14,
	   "apple": "juicy",
	   "hungry": true,
	   "withoutValue": null,
           "answer": 42
          
	}
}

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @json int
    -- Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OASetProperty @json, 'EmitCompact', 0

    -- Assume the file contains the data as shown above..
    DECLARE @success int
    EXEC sp_OAMethod @json, 'LoadFile', @success OUT, 'qa_data/json/sample2.json'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @json, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @json
        RETURN
      END

    -- First navigate to the "sampleData" object:
    DECLARE @sampleData int
    EXEC sp_OAMethod @json, 'ObjectOf', @sampleData OUT, 'sampleData'

    -- Demonstrate BoolAt and BoolOf

    EXEC sp_OAMethod @sampleData, 'BoolOf', @iTmp0 OUT, 'hungry'
    PRINT 'hungry: ' + @iTmp0

    EXEC sp_OAMethod @sampleData, 'BoolAt', @iTmp0 OUT, 2
    PRINT 'hungry: ' + @iTmp0

    -- StringOf returns the value as a string regardless of it's actual type:

    EXEC sp_OAMethod @sampleData, 'StringOf', @sTmp0 OUT, 'pi'
    PRINT 'pi: ' + @sTmp0

    EXEC sp_OAMethod @sampleData, 'StringOf', @sTmp0 OUT, 'answer'
    PRINT 'answer: ' + @sTmp0

    EXEC sp_OAMethod @sampleData, 'StringOf', @sTmp0 OUT, 'withoutValue'
    PRINT 'withoutValue: ' + @sTmp0

    EXEC sp_OAMethod @sampleData, 'StringOf', @sTmp0 OUT, 'hungry'
    PRINT 'hungry: ' + @sTmp0

    -- Demonstrate IsNullOf / IsNullAt

    EXEC sp_OAMethod @sampleData, 'IsNullOf', @iTmp0 OUT, 'withoutValue'
    PRINT 'withoutValue is null? ' + @iTmp0

    EXEC sp_OAMethod @sampleData, 'IsNullAt', @iTmp0 OUT, 3
    PRINT 'withoutValue is null? ' + @iTmp0

    EXEC sp_OAMethod @sampleData, 'IsNullOf', @iTmp0 OUT, 'apple'
    PRINT 'apple is null? ' + @iTmp0

    EXEC sp_OAMethod @sampleData, 'IsNullAt', @iTmp0 OUT, 1
    PRINT 'apple is null? ' + @iTmp0

    -- IntOf

    EXEC sp_OAMethod @sampleData, 'IntOf', @iTmp0 OUT, 'answer'
    PRINT 'answer: ' + @iTmp0

    -- SetNullAt, SetNullOf
    -- Set "pi" to null
    EXEC sp_OAMethod @sampleData, 'SetNullAt', @success OUT, 0
    -- Set "answer" to null
    EXEC sp_OAMethod @sampleData, 'SetNullOf', @success OUT, 'answer'

    -- Show the changes:
    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    -- Restore pi and apple:
    EXEC sp_OAMethod @sampleData, 'SetNumberAt', @success OUT, 0, '3.14'
    EXEC sp_OAMethod @sampleData, 'SetNumberOf', @success OUT, 'answer', '42'

    -- Show the changes:
    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    -- Add a null value named "afterApple" just after "apple"
    EXEC sp_OAMethod @sampleData, 'AddNullAt', @success OUT, 2, 'afterApple'

    -- Add a boolean value just after "pi"
    EXEC sp_OAMethod @sampleData, 'AddBoolAt', @success OUT, 1, 'afterPi', 0

    EXEC @hr = sp_OADestroy @sampleData

    -- Examine the changes..
    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    EXEC @hr = sp_OADestroy @json


END
GO