This module provides methods for retrieving and storing data in
SQL databases. It provides methods for all of the more important
SQL commands (like SELECT, INSERT, REPLACE, UPDATE, DELETE).
It endeavors to produce an interface that will be intuitive to
those already familiar with SQL.
Notable features include:
* data_source generation for some DBD drivers.
* Can check to make sure the connection is not stale and reconnect
if it is.
* Controls statement handles for you.
* Can delay writes.
* Generates complex where clauses from hashes and arrays.
* Shortcuts (convenience functions) for some common cases. (Like
select_all_to_hashref.)
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