SQL Server

JSON: Access Array Values

See more JSON Examples

Demonstrates how to access values in a JSON array. 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

    DECLARE @jsonStr nvarchar(4000)
    SELECT @jsonStr = '{ "id": 1, "name": "A green door", "tags": ["home", 22, "green"], "price": 125 }'

    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 "tags" array, which contains "home", 22, "green"
    DECLARE @tagsArray int
    EXEC sp_OAMethod @json, 'ArrayOf', @tagsArray OUT, 'tags'
    EXEC sp_OAGetProperty @json, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN

        PRINT 'tags member not found.'
        EXEC @hr = sp_OADestroy @json
        RETURN
      END

    -- Get the value at each array index. 
    -- Output will be:
    -- [0] = home
    -- [0] as integer = 0
    -- [1] = 22
    -- [1] as integer = 22
    -- [2] = green
    -- [2] as integer = 0

    DECLARE @arraySize int
    EXEC sp_OAGetProperty @tagsArray, 'Size', @arraySize OUT
    DECLARE @i int

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

        DECLARE @sValue nvarchar(4000)
        EXEC sp_OAMethod @tagsArray, 'StringAt', @sValue OUT, @i



        PRINT '[' + @i + '] = ' + @sValue

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


        PRINT '[' + @i + '] as integer = ' + @iValue

        SELECT @i = @i + 1
      END

    EXEC @hr = sp_OADestroy @tagsArray

    -- Note: The StringAt method returns the value as a string regardless of the type.

    -- 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