Map UpdateField

CREATE PROCEDURE [dbo].[crud_testMap_updateField]
    @itemID int,
    @field nvarchar(64),
    @value nvarchar(max),
    @username nvarchar(64)
AS
BEGIN

if(@field = 'marker') begin
    declare @lat nvarchar(32), @lng nvarchar(32)
    set @lat = [dbo].[str_splitPart](@value,  '||', 1   )
    set @lng = [dbo].[str_splitPart](@value,  '||', 2   )

    update tst_addresses
    set lat = @lat, lng = @lng
    where id = @itemID
end else begin
    select 'Невалидный код свойства' Msg, 0 Result
    return
end
select '' Msg, 1 Result

END