(SQL Server) JSON Iterate Members

Demonstrates how to loop over the immediate members of a JSON object.

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)
    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 @jsonStr nvarchar(4000)
    SELECT @jsonStr = '{ "id": 1, "name": "A green door", "tags": ["home", "green"], "price": 125 }'

    DECLARE @success int
    EXEC sp_OAMethod @json, 'Load', @success OUT, @jsonStr
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @json, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @json
        RETURN
      END

    DECLARE @numMembers int
    EXEC sp_OAGetProperty @json, 'Size', @numMembers OUT
    DECLARE @i int

    SELECT @i = 0
    WHILE @i <= @numMembers - 1
      BEGIN

        DECLARE @name nvarchar(4000)
        EXEC sp_OAMethod @json, 'NameAt', @name OUT, @i
        DECLARE @value nvarchar(4000)
        EXEC sp_OAMethod @json, 'StringAt', @value OUT, @i



        PRINT @name + ': ' + @value

        DECLARE @iValue int
        EXEC sp_OAMethod @json, 'IntAt', @iValue OUT, @i


        PRINT @name + ' as integer: ' + @iValue

        SELECT @i = @i + 1
      END

    -- Note: The StringAt method returns the value as a string regardless of the type.
    -- If the value is a JSON array (such as for ["home", "green"]), then the JSON encoding
    -- of the entire array is returned.

    -- The IntAt method returns the value as an integer.  If the value does not convert to 
    -- an integer, then 0 is returned

    EXEC @hr = sp_OADestroy @json


END
GO