How to use DS's text processing to parsel the text data stored in DB table?

I want to use DS's text processing to parse the text data stored in a database table, but all the demo I see is parsing text from a flat file. I tried with the blueprint  sample and edit the input from a flat file to database table, but can not map the column with the base entityExtraction. anyone can give me a guide or example? thanks so much!
regards,
Bin

Still looking for some ansewers. Can any one help me?

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