SSIS 2012: How do I change the project's environment variables?

Question

I want to change 2 date project variables, StartDateTime and EndDateTime. I have another variable called RunType. Very simply, I want to read the value RunType first. If it is set to "Incremental" I want to change the StartDate from whatever it is to 12:00:00 AM yesterday and the EndDate to 11:59:59 PM yesterday. The errors I get from trying to write back the values seem to indicate writes are out on project level variables. Is this true--or is there something I need to do differently when dealing with these project level variables? I thought of creating package level variables, a control table, blah blah... It seems like overkill for this.

When I test the package manually by changing the parameter values under the integration service catalog/environments--I get the range I expect. This package will run via sql agent job. Is there a pre-ssis step I can create and execute to do this simple task outside of ssis?

Answer 1

While the values may be stored in internal.object_parameters, resist the temptation to edit the values in those tables directly. Instead use the supplied methods for manipulation. In this case, the stored procedure catalog.set_environment_variable_value.

Below is a sample of how you can programmatically change the value of an environment variable. I would see this as being a TSQL jobstep in SQL Agent job that runs prior to your package launching to ensure the correct values for StartDateTime and EndDateTime are set as expected.

DECLARE @var sql_variant;

DECLARE
    @StartDateTime date
,   @EndDateTime datetime
,   @RunType bit = 1;

SELECT
    @StartDateTime = CAST(dateadd(d, -1, CURRENT_TIMESTAMP) AS date)
,   @EndDateTime = DATEADD(s, -1, cast(cast(current_timestamp AS date) AS datetime))

SELECT @StartDateTime, @EndDateTime;


IF (@RunType = 1)
BEGIN
    SET @var = @StartDateTime;
    EXECUTE [SSISDB].[catalog].[set_environment_variable_value] 
        @variable_name=N'StartDateTime'
    ,   @environment_name=N'MyEnvironmentName'
    ,   @folder_name=N'MyFolder'
    ,   @value=@var;

    SET @var = @EndDateTime;
    EXECUTE [SSISDB].[catalog].[set_environment_variable_value] 
        @variable_name=N'EndDateTime'
    ,   @environment_name=N'MyEnvironmentName'
    ,   @folder_name=N'MyFolder'
    ,   @value=@var;
END
ELSE
BEGIN
    PRINT 'Logic goes here to handle the other conditions for RunType'
END