(SQL Server) HTTP POST JSON and Parse JSON Response

Demonstrates how to send a JSON POST and then parse the JSON response.

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)
    -- This example assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    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

    DECLARE @success int
    EXEC sp_OAMethod @json, 'LoadFile', @success OUT, 'qa_data/json/jsonBodyForHttpPost.json'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @json, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @json
        RETURN
      END

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

    DECLARE @resp int
    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    EXEC sp_OAMethod @http, 'PostJson2', @resp OUT, 'https://test.something.com/XYZ/API/v1/CreditInsuranceCalculator/CalculatePremiums', 'application/json', @sTmp0
    EXEC sp_OAGetProperty @http, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @json
        EXEC @hr = sp_OADestroy @http
        RETURN
      END

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

    EXEC sp_OAGetProperty @resp, 'BodyStr', @sTmp0 OUT
    EXEC sp_OAMethod @jsonResp, 'Load', @success OUT, @sTmp0

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

    -- The JSON response to be parsed looks like this:
    -- {
    --   "LifeAmount": 513.85,
    --   "LifeResidualAmount": 123.38,
    --   "CriticalIllnessAmount": 0,
    --   "CriticalIllnessResidualAmount": 0,
    --   "DisabilityAmount": 881.70,
    --   "PolicyFee": 0.00,
    --   "PolicyFeeSecondary": 0,
    --   "PolicyFeeHidden": 50.00,
    --   "PolicyFeeHiddenSecondary": 0
    -- }

    -- We can get the floating point numbers as strings.  Then convert to double
    -- using the appropriate string-to-double conversion for your programming language.
    -- For example, in C++ use atof.  In C# use Convert.ToDouble.  
    DECLARE @lifeAmount nvarchar(4000)
    EXEC sp_OAMethod @jsonResp, 'StringOf', @lifeAmount OUT, 'LifeAmount'
    DECLARE @lifeResidualAmount nvarchar(4000)
    EXEC sp_OAMethod @jsonResp, 'StringOf', @lifeResidualAmount OUT, 'LifeResidualAmount'


    PRINT 'LifeAmount = ' + @lifeAmount

    PRINT 'LifeResidualAmount = ' + @lifeResidualAmount

    EXEC @hr = sp_OADestroy @json
    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @jsonResp


END
GO