(SQL Server) Insert JSON Object into another JSON Object

Demonstrates how to insert one JSON object into another. Effectively, the JSON object must be copied into the other..

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
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- Imagine we have two separate JSON objects.
    DECLARE @jsonA int
    -- Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @jsonA OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int
    EXEC sp_OAMethod @jsonA, 'UpdateString', @success OUT, 'animal', 'zebra'
    EXEC sp_OAMethod @jsonA, 'UpdateString', @success OUT, 'colors[0]', 'white'
    EXEC sp_OAMethod @jsonA, 'UpdateString', @success OUT, 'colors[1]', 'black'

    EXEC sp_OASetProperty @jsonA, 'EmitCompact', 0
    EXEC sp_OAMethod @jsonA, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    -- jsonA contains:

    -- {
    --   "animal": "zebra",
    --   "colors": [
    --     "white",
    --     "black"
    --   ]
    -- }

    DECLARE @jsonB int
    -- Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @jsonB OUT

    EXEC sp_OAMethod @jsonB, 'UpdateString', @success OUT, 'type', 'mammal'
    EXEC sp_OAMethod @jsonB, 'UpdateBool', @success OUT, 'carnivore', 0

    EXEC sp_OASetProperty @jsonB, 'EmitCompact', 0
    EXEC sp_OAMethod @jsonB, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    -- jsonB contains:

    -- {
    --   "type": "mammal",
    --   "carnivore": false
    -- }

    -- Let's say we want to insert jsonB into jsonA to get this:

    -- {
    --   "animal": "zebra",
    --   "info" " {
    --       "type": "mammal",
    --       "carnivore": false
    -- 	},
    --   "colors": [
    --     "white",
    --     "black"
    --   ]
    -- }

    -- First add an empty object at the desired location:
    EXEC sp_OAMethod @jsonA, 'AddObjectAt', @success OUT, 1, 'info'

    -- Get the JSON object at that location, and load the JSON..
    DECLARE @jsonInfo int
    EXEC sp_OAMethod @jsonA, 'ObjectOf', @jsonInfo OUT, 'info'
    EXEC sp_OAMethod @jsonB, 'Emit', @sTmp0 OUT
    EXEC sp_OAMethod @jsonInfo, 'Load', @success OUT, @sTmp0
    EXEC @hr = sp_OADestroy @jsonInfo

    EXEC sp_OAMethod @jsonA, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    -- The end result is this:

    -- {
    --   "animal": "zebra",
    --   "info": {
    --     "type": "mammal",
    --     "carnivore": false
    --   },
    --   "colors": [
    --     "white",
    --     "black"
    --   ]
    -- }

    EXEC @hr = sp_OADestroy @jsonA
    EXEC @hr = sp_OADestroy @jsonB


END
GO