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For setting up new variables within the SSIS Environment, you want to have SSDT open as well as SSMS.
Copy and paste the name & value for each parameter from the SSDT parameters window into the SSIS environment variable window (note: I tend to use an EV prefix but that's just a personal preference).
This describes one way to handle connections by grouping them with parameters.
I ensure that all connections are project level (not package level) and then I like to parameterize each of my connection strings: In this example I've parameterized the connecting string itself.
Let's say a column is deleted in the underlying table or view that feeds an SSIS package.
Or, maybe you're starting with a 'template' SSIS package that has metadata for a different table than the one you are building..you adjust the source query, you see red X's on the precedence constraints (pipeline paths) in the data flow: Prior to SQL Server 2012, updating metadata changes of this nature was a very tedious process. First, you right-click on the precedence constraint and choose Resolve References: And voila, the references no longer exist for the transformations down below in the data flow.
And here's an example of how a source query in my data flow has been associated to the project parameters: Usually an SSIS project of any size ends up with at least a few project/package parameters, but it is possible that you don't have any.
A few days ago I was speaking with an SSIS developer who wasn't aware of this change so I thought I'd share it.Next we want to create a new SSIS Environment (assuming it doesn't already exist).Environments are usually called Dev, QA, Prod, that sort of thing, but they could of course be used differently in some situations.This technique is applicable to SQL Server 2012 and up, and only to the project deployment mode (i.e., not package deployment mode).The concept of SSIS Configurations is no longer applicable with the project deployment mode as they've been replaced with SSIS Environment Variables.
My Blue Granite colleague and friend Meagan Longoria has been convincing me recently that these are the kind of changes that BIML is well-equipped to take care of quickly & efficiently when it regenerates a package.