feat(sqlalchemy): added option to support oracle database

pallets-eco#102

Author: christopherpickering

flask_session/__init__.py

@@ -91,6 +91,7 @@ def _get_interface(self, app):
         config.setdefault("SESSION_MONGODB_TZ_AWARE", False)
         config.setdefault("SESSION_SQLALCHEMY", None)
         config.setdefault("SESSION_SQLALCHEMY_TABLE", "sessions")
+        config.setdefault("SESSION_SQLALCHEMY_SEQUENCE", None)
 
         if config["SESSION_TYPE"] == "redis":
             session_interface = RedisSessionInterface(
@@ -134,6 +135,7 @@ def _get_interface(self, app):
                 config["SESSION_KEY_PREFIX"],
                 config["SESSION_USE_SIGNER"],
                 config["SESSION_PERMANENT"],
+                config["SESSION_SQLALCHEMY_SEQUENCE"],
             )
         else:
             session_interface = NullSessionInterface()

flask_session/sessions.py

@@ -562,7 +562,16 @@ class SqlAlchemySessionInterface(SessionInterface):
     serializer = pickle
     session_class = SqlAlchemySession
 
-    def __init__(self, app, db, table, key_prefix, use_signer=False, permanent=True):
+    def __init__(
+        self,
+        app,
+        db,
+        table,
+        key_prefix,
+        use_signer=False,
+        permanent=True,
+        sequence=None,
+    ):
         if db is None:
             from flask_sqlalchemy import SQLAlchemy
 
@@ -571,12 +580,21 @@ def __init__(self, app, db, table, key_prefix, use_signer=False, permanent=True)
         self.key_prefix = key_prefix
         self.use_signer = use_signer
         self.permanent = permanent
+        self.sequence = sequence
         self.has_same_site_capability = hasattr(self, "get_cookie_samesite")
 
         class Session(self.db.Model):
             __tablename__ = table
 
-            id = self.db.Column(self.db.Integer, primary_key=True)  # noqa: A003, VNE003
+            if sequence:
+                id = self.db.Column(
+                    self.db.Integer, self.db.Sequence(sequence), primary_key=True
+                )
+            else:
+                id = self.db.Column(
+                    self.db.Integer, primary_key=True
+                )  # noqa: A003, VNE003
+
             session_id = self.db.Column(self.db.String(255), unique=True)
             data = self.db.Column(self.db.LargeBinary)
             expiry = self.db.Column(self.db.DateTime)