Patch for OCI8Statement to support param[0] being null. Switched isset to array_key_exists. Added test that demonstrates the bug and confirms the fix.

DBAL-132 - Make Table::addUnnamedForeignKeyConstraint() generate a name based on the input, @deprecated addUnnamedForeignKeyConstraint and addNamedForeignKeyConstraint.

DDC-1282 - Remove overprotective casting of days/months to integer, which prevents passing columns as days. The platform is not responsible for escapsing, the DQL parser already does it way before generating the sql statements.

DDC-1271 - Fix date diff in PostgreSQL when timestamps are passed by casting everything into dates explicitly.

This reverts commit 0d2af886, reversing
changes made to eb0a4615.

DDC-1271 - Fix date diff in PostgreSQL when timestamps are passed by casting everything into dates explicitly.

Fixed: MySQL Driver didn't return Database name if DBAL was initialized using existing PDO instance

Writing the result into the output object instead of just echoing it out.

Support for Postgres SET NULL, SET DEFAULT, and NO ACTION foreign key detection in the PostgresSQLSchema Manager

OCI8 Change private properties and methods to protected.