Is there a way to execute T-SQL code inside a Dataflow in SSIS?

Question

Background

I have a dimension table that has a single record for each day. Each record has a primary key so example data would be:

Dimension Table
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| ID   | DateTime               |
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| 1083 | 04/10/2008 10:02:00 PM |
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What I am trying to do is take my source data column which has a SQL datetime value (such as 04/10/2008 10:02:00 PM) and have SSIS derive what the primary key from the dimension table should be (1083 in the above example). I am trying to fit this into the Data Flow within my package and avoid using staging tables.

I would like to call a database function during my dataflow to have my SSIS package discover the timeid for a datetime record. I have tried to use DeriveColumn but that doesn't seem to allow the use of T-SQL; rather only functions that are built into ANSI SQL.

Question

Is there another way to do this inside the dataflow? Or will I need to use staging tables and use a SQLTask outside of the dataflow to manipulate my data?

Answer 1

If I understand you, you have a data mart with a time dimension, and you need to get the timeId that corresponds to a particular time.

If that's correct, then you want to use a Lookup component. For the reference table use something like SELECT timeId, timeStamp FROM TimeDimension, then look up against the input column that holds the timestamp. Use the timeId as the output column, and now each row in your data flow will have the timeId that corresponds to its time stamp.