Help Me! About Snap! API.

Thank you so much Sir @jguille2 for the Snap4Arduino http protocol Link, but my question is so much related to @ericstein post

Is there any working sample of this API for me to start with?
That would be a great help for me.

What realy i am working on is a Snap Modification so that it can Access a Database using Blocks. I want Snap to be able to Read and Write a database by building a new Block that can Build Database Queries Like - "Select * From TableStudents" or
UPDATE table_name
SET column1 = value1 , column2 = value2 , ...
WHERE condition ;

This is what i come up so far:
SnapAPI2

I want to capture and execute the value of the abc varible from outside Snap. Can I do that using Snap API?