How do I use a variable within a sql statement

I am trying to use a local variable within an open SQL step but I keep getting an error.
My sql command looks like this "SELECT BoardDetailID FROM BoardDetails WHERE SerialNumber = " + locals.CurrentSerialNo
If I replace the locals.CurrentSerialNo with an actual value such as below the statement works fine.
"SELECT BoardDetailID FROM BoardDetails WHERE SerialNumber = " + " 'ABC001' "
Can someone tell me how to correctly format the statement to use a variable?

Hi,
Thanks for the reply. I have changed the required variable to a string, but with no success. I have reattached my updated sequence file and an image of the error.
When looking at the Data operation step I see that the sql statement is missing everything after the last quotation mark.
Thanks again,
Stuart
Attachments:
Database Test Sequence.seq ‏10 KB
TestStand error.JPG ‏37 KB

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