I'm attempting to use the cx_Oracle.Cursor.executemany method to execute a PL/SQL block, and I want to use the batcherrors parameter to catch any errors that might occur. However, my sample statement throws an error on the first execution rather than batching the errors.

>>> sql = """
>>> begin
>>>    raise_application_error(-20000, :0);
>>> end;
>>> """
>>> cursor.executemany(sql, [['a'], ['b']], batcherrors=True)
Traceback (most recent call last):
  File "<stdin>", line 5, in <module>
cx_Oracle.DatabaseError: ORA-20000: a
ORA-06512: at line 3

>>> cursor.getbatcherrors()
[]

Is this not the intended functionality of the batcherrors parameter and getbatcherrors method? And if not, can that be clarified in the documentation?

I'm running cx_Oracle 5.3 on 32-bit Python 2.7.11 on a 64-bit Windows 10 box.

(Note: I recognize that there's not really a good reason to use executemany on a PL/SQL block, but I think this should probably be clarified in the documentation.)