execute() does not fail if an incorrect number of parameters is specified

[philip-stoev]

Statements such as:

    cursor.execute("SELECT ? FROM DUAL");
    cursor.execute("SELECT ?, ? FROM DUAL", []);

must fail with an exception such as "wrong number of parameters specified, expected X got Y". Otherwise, simple typos may lead to data loss or wrong results.

Others fail with an exception "TypeError: init() takes exactly 2 arguments (1 given)" which is not very informative.

[jgetto]

I improved the "incorrect number of parameters error message" and made it account for

cursor.execute("SELECT ?, ? FROM DUAL", []);

This caused test_toomany_parameters and test_insufficient_parameters to error out. Do you want to fix them? I also noticed that they aren't using the

with self.assertRaises(SomeException):
    do_something()

assertion. That might be more stable than try/except+asssert?

[jgetto]

The cursor.execute("SELECT ? FROM DUAL"); is tracked as DB-3312, since NuoDB doesn't seem to complain at a non-prepared statement with parameters.