SQL Server

JSON: Nested Array

See more JSON Examples

Here we have a JSON object that contains nested arrays. This example demonstrates how to access the contents of the nested arrays.

{
 "numbers" : [ 
    ["even", 2, 4, 6, 8], 
    ["prime", 2, 3, 5, 7, 11, 13] 
  ] }

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
    DECLARE @iTmp0 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 @json int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
    -- The presence of whitespace chars for pretty-printing makes no difference to the Load
    -- method. 
    DECLARE @jsonStr nvarchar(4000)
    SELECT @jsonStr = '{ "numbers" : [ ["even", 2, 4, 6, 8], ["prime", 2, 3, 5, 7, 11, 13] ] }'

    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

    -- Get the value of the "numbers" object, which is an array that contains JSON arrays.
    DECLARE @outerArray int
    EXEC sp_OAMethod @json, 'ArrayOf', @outerArray OUT, 'numbers'
    EXEC sp_OAGetProperty @json, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN

        PRINT 'numbers array not found.'
        EXEC @hr = sp_OADestroy @json
        RETURN
      END

    DECLARE @numArrays int
    EXEC sp_OAGetProperty @outerArray, 'Size', @numArrays OUT
    DECLARE @i int

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

        DECLARE @innerArray int
        EXEC sp_OAMethod @outerArray, 'ArrayAt', @innerArray OUT, @i

        -- The first item in the innerArray is a string
        EXEC sp_OAMethod @innerArray, 'StringAt', @sTmp0 OUT, 0

        PRINT @sTmp0 + ':'

        DECLARE @numInnerItems int
        EXEC sp_OAGetProperty @innerArray, 'Size', @numInnerItems OUT
        DECLARE @j int

        SELECT @j = 1
        WHILE @j <= @numInnerItems - 1
          BEGIN


            EXEC sp_OAMethod @innerArray, 'IntAt', @iTmp0 OUT, @j
            PRINT '  ' + @iTmp0

            SELECT @j = @j + 1
          END

        EXEC @hr = sp_OADestroy @innerArray

        SELECT @i = @i + 1
      END

    EXEC @hr = sp_OADestroy @outerArray


    EXEC @hr = sp_OADestroy @json


END
GO