Add simple error code values and a place to store them

Revise $dbh->exec().
The driver doer() method should populate dbh->affected_rows if it can determine its value.

Add $dbh->exec() method.
Rename $dbh->beginWork() to $dbh->beginTransaction().

Expand the prepare() prototype to accept additional options.

forgotten off the last commit

handle binding/quoting of queries for drivers with emulated prepares

Skeleton for emulated prepare()

we need the source string length for binary safe string handling

include guard

Some pedantic fixes for gcc.

Hello PDO.

Still more to come. Give it a couple of days before starting to write drivers
for the other databases; a few things might change, so I'd like to coordinate
that, but in a

Hello PDO.

Still more to come. Give it a couple of days before starting to write drivers
for the other databases; a few things might change, so I'd like to coordinate
that, but in a couple of days.

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