- Hvis der opstår fejl med cx_Oracle, er det nok bedst at logge disse til en tekstfil.
- Du kan prøve at omdirigere sys.stdout og sys.stderr til fillignende objekter, som logger det, der er skrevet til dem, til en logger.
- Jeg vil gætte på, at du ønsker at forpligte dig efter hver begivenhed, medmindre du har stærke grunde til ikke at gøre dette. Alternativt kan du buffere flere hændelser og skrive dem alle i en enkelt transaktion med jævne mellemrum.
- Nedenfor er et eksempel, der bruger mx.ODBC, du kan sikkert tilpasse dette til cx_Oracle uden for mange problemer. Det er meningen, at det skal være Python DB-API 2.0-kompatibelt, tror jeg.
Den selvstændige Python-logningsdistribution (før logning blev tilføjet til Python) er på http://www.red-dove.com/python_logging.html, og selvom logningspakken i Python er meget mere opdateret, indeholder den selvstændige distribution en test mappe, som har en masse nyttige eksempler på afledte handlerklasser.
#!/usr/bin/env python
#
# Copyright 2001-2009 by Vinay Sajip. All Rights Reserved.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose and without fee is hereby granted,
# provided that the above copyright notice appear in all copies and that
# both that copyright notice and this permission notice appear in
# supporting documentation, and that the name of Vinay Sajip
# not be used in advertising or publicity pertaining to distribution
# of the software without specific, written prior permission.
# VINAY SAJIP DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
# ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
# VINAY SAJIP BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
# ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
# IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# This file is part of the standalone Python logging distribution. See
# http://www.red-dove.com/python_logging.html
#
"""
A test harness for the logging module. An example handler - DBHandler -
which writes to an Python DB API 2.0 data source. You'll need to set this
source up before you run the test.
Copyright (C) 2001-2009 Vinay Sajip. All Rights Reserved.
"""
import sys, string, time, logging
class DBHandler(logging.Handler):
def __init__(self, dsn, uid='', pwd=''):
logging.Handler.__init__(self)
import mx.ODBC.Windows
self.dsn = dsn
self.uid = uid
self.pwd = pwd
self.conn = mx.ODBC.Windows.connect(self.dsn, self.uid, self.pwd)
self.SQL = """INSERT INTO Events (
Created,
RelativeCreated,
Name,
LogLevel,
LevelText,
Message,
Filename,
Pathname,
Lineno,
Milliseconds,
Exception,
Thread
)
VALUES (
%(dbtime)s,
%(relativeCreated)d,
'%(name)s',
%(levelno)d,
'%(levelname)s',
'%(message)s',
'%(filename)s',
'%(pathname)s',
%(lineno)d,
%(msecs)d,
'%(exc_text)s',
'%(thread)s'
);
"""
self.cursor = self.conn.cursor()
def formatDBTime(self, record):
record.dbtime = time.strftime("#%m/%d/%Y#", time.localtime(record.created))
def emit(self, record):
try:
#use default formatting
self.format(record)
#now set the database time up
self.formatDBTime(record)
if record.exc_info:
record.exc_text = logging._defaultFormatter.formatException(record.exc_info)
else:
record.exc_text = ""
sql = self.SQL % record.__dict__
self.cursor.execute(sql)
self.conn.commit()
except:
import traceback
ei = sys.exc_info()
traceback.print_exception(ei[0], ei[1], ei[2], None, sys.stderr)
del ei
def close(self):
self.cursor.close()
self.conn.close()
logging.Handler.close(self)
dh = DBHandler('Logging')
logger = logging.getLogger("")
logger.setLevel(logging.DEBUG)
logger.addHandler(dh)
logger.info("Jackdaws love my big %s of %s", "sphinx", "quartz")
logger.debug("Pack my %s with five dozen %s", "box", "liquor jugs")
try:
import math
math.exp(1000)
except:
logger.exception("Problem with %s", "math.exp")