Issue #805858 by Pancho, Steven Jones, simg: Fixed Affected rows inconsistent across database engines.

Issue #203955 by pdrake, webchick, andrewsl, iflista: Create database at installation time if the db user has appropriate permissions.

Issue #843114 by sun, quicksketch, Berdir, c960657, Crell: Fixed DatabaseConnection::__construct() and DatabaseConnection_mysql()::__construct() leaks  (Too many connections).

Fixes #1567438 - Wrong transaction type was being catched in a MySQL transaction specific loop when releasing transactions

Catch DatabaseExceptions in MySQL's sequence emulation rather than PDOException, since we're now always wrapping the latter.

Issue #1171866 by sun: Fixed Enforced fetching of fields/columns in lowercase breaks third-party integration.

Rename classes to remove the redundant Database prefix and move query exceptions into the query namespace.

Initial move and rename of database classes to PSR-0 namespaces.  So far only MySQL has been converted.

Nate Lampton authored Oct 30, 2011 and catch committed Nov 01, 2011

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

Issue #1007830 follow-up by bfroehle: Better fix for nested transactions throw exceptions on ddl changes in MySQL.

Issue #1007830 follow-up by bfroehle: Add more specificity to MySQL nested DDL transaction error check.

Issue #1007830 by drunken monkey, Damien Tournoud, bfroehle: Fixed Nested transactions throw exceptions on ddl changes.

- Patch #878198 by pwolanin, Damien Tournoud: add back a method to the DB driver interface that reports the server version.

- Patch #878198 by pwolanin: add back a method to the DB driver interface that reports the server version.

#710142 by Berdir, moshe weitzman, chx: Handle exceptions in shutdown functions (with tests). Hopefully the last of these weird 'Stack frame in Unknown line 0' errors.

#616650 by Crell: Default MySQL to transactions ON. Makes sense now that we default to InnoDB as well.

#356074 by chx and Damien Tournoud: Provide a sequences API. Gets rid of stupid tables that only contain an incrementing ID, and fixes database import problems due to user ID 0.

#564394 by Berdir and Crell: Removed database BC layer. nah nah nah nah... hey hey hey... gooood byeeee...