Wrapper
Basically a wrapper is something that allows a (java) client to access to
a source so a Wrapper can be described with a simple (Java) interface.
A wrapper is basically able to perform 2 tasks:
- the source introspection: this describes the source "schema" in a
MOMIS way, using both ODLi3 and an XML description.
- the source querying: the wrapper (by the interface WrapperRS)
enables a client to access data through a Result Set,
that data resulting from a query are accessible
as cursor on a table.
Operation allowed are to get the numeber of
selected columns, get value of a given column and move
the cursor on the next row of the table.
Bibliografia di base:
Last Update: 5 Dicember 2005