De-emphasize notion of "default driver" (DBAPI)

Fixes: #6960

Even though a default driver still exists for
each dialect, remove most usages of `dialect://`
to encourage users to explicitly specify
`dialect+driver://`

Change-Id: I0ad42167582df509138fca64996bbb53e379b1af

3 files changed, 3 insertions, 3 deletions

diff --git a/examples/large_collection/large_collection.py b/examples/large_collection/large_collection.py
index 0f34c54dc..2b8c57232 100644
--- a/examples/large_collection/large_collection.py
+++ b/examples/large_collection/large_collection.py
@@ -69,7 +69,7 @@ mapper(Member, member_table)
 
 if __name__ == "__main__":
     engine = create_engine(
-        "postgresql://scott:tiger@localhost/test", echo=True
+        "postgresql+psycopg2://scott:tiger@localhost/test", echo=True
     )
     meta.create_all(engine)
 
diff --git a/examples/materialized_paths/materialized_paths.py b/examples/materialized_paths/materialized_paths.py
index 37e91684c..ad2a4f4a9 100644
--- a/examples/materialized_paths/materialized_paths.py
+++ b/examples/materialized_paths/materialized_paths.py
@@ -106,7 +106,7 @@ class Node(Base):
 
 if __name__ == "__main__":
     engine = create_engine(
-        "postgresql://scott:tiger@localhost/test", echo=True
+        "postgresql+psycopg2://scott:tiger@localhost/test", echo=True
     )
     Base.metadata.create_all(engine)
 
diff --git a/examples/postgis/postgis.py b/examples/postgis/postgis.py
index a12b824ba..2b45b98f5 100644
--- a/examples/postgis/postgis.py
+++ b/examples/postgis/postgis.py
@@ -233,7 +233,7 @@ if __name__ == "__main__":
     from sqlalchemy.ext.declarative import declarative_base
 
     engine = create_engine(
-        "postgresql://scott:tiger@localhost/test", echo=True
+        "postgresql+psycopg2://scott:tiger@localhost/test", echo=True
     )
     metadata = MetaData(engine)
     Base = declarative_base(metadata=metadata)