Context Bindings

The expression {p in Persons where age>21} assumes the collection of Persons is already in memory.

But where might it come from:

1. It might have been passed in as an input
2. We might have constructed it earlier in the program
3. We might read it from a database

Note that the expression already looks a bit like a SQL query, so how might we connect this expression to a database

Maybe we simply treat {p in Persons where age>21} as if it were an instance method applied to a database table For example something along these lines:

CONN=createConnection(DATABASE='MYSQL',TABLE='PERSONS',USER='admin',PASSWORD='')

C1=CONN.{p in Persons where age>21}