Deprecation: #78244 - Deprecate TYPO3_DB and Prepared Statement class 

See forge#78244

Description 

The classes TYPO3\CMS\Core\Database\DatabaseConnection and TYPO3\CMS\Core\Database\PreparedStatement have been marked as deprecated. This classes have been succeeded by Doctrine DBAL in TYPO3 v8, and will be removed in TYPO3 v9.

Impact 

Calling any methods of the classes above will trigger a deprecation log entry.

Affected Installations 

Any TYPO3 instances with references to $GLOBALS['TYPO3_DB'] or use instances of the mentioned classes above.

Migration 

Use the ConnectionPool and the QueryBuilder classes to achieve future-proof and proper database abstraction for future TYPO3 versions.