How to make DB connection url string as Text

Hi 

I am using Import Excel to  Database Smart service and for Datasource I tried to make connection using Connected System .I called the CS in constant using  CS as its type .But in Import excel smart service ,

Datasource is defined Text type .
Is it possible to give DB connection url string as Text and pass it in constant and then use it .
If yes then what is correct connection url string?

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