SQL Server

Load JSON Object from HTTP Response Body

Demonstrates how to load the HTTP response body directly into a JSON object. SQL Server

-- 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)
    DECLARE @success int
    SELECT @success = 0

    DECLARE @http int
    EXEC @hr = sp_OACreate 'Chilkat.Http', @http OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @resp int
    EXEC @hr = sp_OACreate 'Chilkat.HttpResponse', @resp OUT

    EXEC sp_OAMethod @http, 'HttpStr', @success OUT, 'GET', 'https://www.chilkatsoft.com/exampledata/sample.json', '', '', '', @resp
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @resp
        RETURN
      END

    -- A JSON object is JSON that begins with "{" and ends with "}"
    DECLARE @json int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT

    -- If we wish to transfer (instead of copy) the JSON from the HttpResponse to the JsonObject, then add the keyword "TakeResponseBody" to UncommonOptions
    -- This could save memory for extremely large JSON responses.
    EXEC sp_OASetProperty @resp, 'UncommonOptions', 'TakeResponseBody'

    EXEC sp_OAMethod @resp, 'GetBodyJson', @success OUT, @json

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

    -- Note: If UncommonOptions contained "TakeResponseBody", then the response BodyStr will now be empty:

    PRINT '----'
    EXEC sp_OAGetProperty @resp, 'BodyStr', @sTmp0 OUT
    PRINT @sTmp0

    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @resp
    EXEC @hr = sp_OADestroy @json


END
GO