[Sqlalchemy-tickets] Issue #3215: branched connection does not propagate invalidation to parent (zzzeek/sqlalchemy)

[Mike B. <iss...@bi...>]

New issue 3215: branched connection does not propagate invalidation to parent
https://bitbucket.org/zzzeek/sqlalchemy/issue/3215/branched-connection-does-not-propagate

Mike Bayer:


```
#!python

from sqlalchemy import create_engine, exc

e = create_engine("postgresql://scott:tiger@localhost/test", echo=True)

def test_one():
    c1 = e.connect()

    dbapi_conn = c1.connection.connection
    dbapi_conn.close()

    try:
        c1.execute("select 'hi'")
    except exc.DBAPIError:
        pass

    assert c1.invalidated
    c1.execute("select 'hi'")
    assert not c1.invalidated
    c1.close()

def test_two():
    c2 = e.connect()

    c2_branch = c2.connect()

    dbapi_conn = c2.connection.connection
    dbapi_conn.close()

    try:
        c2_branch.execute("select 'hi'")
    except exc.DBAPIError:
        pass

    assert c2_branch.invalidated

    # fails
    assert c2.invalidated

    # sqlalchemy.exc.StatementError: 'NoneType' object
    # has no attribute 'cursor' (original cause: AttributeError:
    # 'NoneType' object has no attribute 'cursor') u"select 'hi'" []
    c2.execute("select 'hi'")

    assert not c2_branch.invalidated
    c2.close()



test_one()
test_two()
```