Python Mysql Error Handler
Contents |
here for a quick overview of the site Help Center Detailed answers to any
Pymysql Error Handling
questions you might have Meta Discuss the workings and policies mysqldb error codes of this site About Us Learn more about Stack Overflow the company Business Learn more about
Python Pymysql Error Handling
hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack python mysqldb operationalerror Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error handling in Python-MySQL up vote 1 down vote favorite I am running a little webservice based on python flask, where I want to execute a small MySQL Query. python sql error handling When I get a valid input for my SQL query, everything is working as expected and I get the right value back. However, if the value is not stored in the database I receive a TypeError Traceback (most recent call last): File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1836, in __call__ return self.wsgi_app(environ, start_response) File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1820, in wsgi_app response = self.make_response(self.handle_exception(e)) File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1403, in handle_exception reraise(exc_type, exc_value, tb) File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1817, in wsgi_app response = self.full_dispatch_request() File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1478, in full_dispatch_request response = self.make_response(rv) File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1566, in make_response raise ValueError('View function did not return a response') ValueError: View function did not return a response I tried to tap into error handling myself and use this code for my project, but it seems like this doesn't work properly. #!/usr/bin/python from flask import Flask, request import MySQLdb import json app = Flask(__name__) @app.route("/get_user", methods=["POST"]) def get_user(): data = json.loads(request.data) email = data["email"
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring
_mysql_exceptions
developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question mysqldb execute x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join
Mysqldb Documentation
them; it only takes a minute: Sign up Correct exception handling with python MySQLdb connection up vote 6 down vote favorite 1 I created a small/basic python script to insert data into a MySQL database. I included some error handling http://stackoverflow.com/questions/30996401/error-handling-in-python-mysql - mainly to close the connection and/or prevent hanging connections in the case of an error (...but also to ignore some errors). I thought what I had (see below) was right - it seemed to be working okay. But occasionally I have been getting "Too many connection" errors - which I assumes means I am not actually closing the connection correctly at all (or perhaps error handling isn't right). conn=MySQLdb.connect(host=####, user=####, passwd=####, db=####) curs=conn.cursor() try: curs.execute(sql) conn.commit() except MySQLdb.Error http://stackoverflow.com/questions/21721109/correct-exception-handling-with-python-mysqldb-connection as e: if e[0]!= ###: raise finally: curs.close() conn.close() (I also tried without finally:) The other (I think important) point is that it is that the MySQL database uses an InnoDB storage engine. This is the first time I have used InnoDB engine and perhaps there are some differences to MyISAM that are relevant here, that I am not aware of (like conn.commit(), but for an error).... That seems to be the source of all my other problems! Thanks in advance python error-handling innodb mysql-python share|improve this question edited Feb 14 '14 at 3:34 asked Feb 12 '14 at 7:15 djmac 1591413 You should remove the conn.close() from the try body, as it will always be called within the finally body. Other than that, it looks like you're releasing your connections properly. –lanzz Feb 12 '14 at 7:51 Thanks Lanzz - sorry I made an error copying the code (was playing around without finally:, and had a conn.close() in the try body and the except body). Have fixed the question (still have the same problem, either way) –djmac Feb 14 '14 at 3:33 add a comment| 1 Answer 1 active oldest votes up vote 2 down vote I believe the issue was I wasn't invoking conn.rollback() in the except clause (and consequently, the connection was not closing properly). One line (see below) seemed to fix the issue (I can't be exactly
now Close Packt Logo Books & Videos Tech Packt Support Search My Collection Cart Book & Video Categories Web DevelopmentBig Data & Business IntelligenceApplication DevelopmentVirtualization & CloudGame DevelopmentNetworking https://www.packtpub.com/books/content/exception-handling-mysql-python & ServersHardware & CreativeBusiness All ProductsAll BooksAll VideosLatest Releases 50%off Deal of the Day https://sourceforge.net/p/mysql-python/mysqldb-2/ci/d55bfb1a4701f8eec4ebb087bba409fbd20ce4c3/tree/MySQLdb/exceptions.py A fast-paced guide to get you up and running with Swift 3 and its new features €12.60 RRP €25.18 Sign up here to get these deals straight to your inbox Tech Android AngularJS Arduino Blender Bootstrap Data Analysis Django Docker Drupal Graphics Programming Hadoop Internet of Things iOS Java JavaScript jQuery Linux Machine Learning OpenCV OpenStack sql error Oracle Penetration Testing PHP PostgreSQL Python QlikView R Scala Spark Spring Swift Unity WordPress Packt Publishing About Us Our Authors Trade & Partners Contact Us Careers Support FAQs Ordering Information Terms & Conditions Code Downloads & Errata Submit Errata Mapt Subscribe Mapt For Business Take me to Mapt Search Added to Cart ...and more You don't have anything in your cart right now. Subtotal 0.00 Free shipping on print orders for sql error handling US, UK, Europe and selected Asian countries View Cart Check Out Title added to cart Home > Books > MySQL for Python Exception Handling in MySQL for Python Albert Lukaszewski, PhD September 2010 MySQL for Python Integrate the flexibility of Python and the power of MySQL to boost the productivity of your Python applications Implement the outstanding features of Python's MySQL library to their full potential See how to make MySQL take the processing burden from your programs Learn how to employ Python with MySQL to power your websites and desktop applications Apply your knowledge of MySQL and Python to real-world problems instead of hypothetical scenarios A manual packed with step-by-step exercises to integrate your Python applications with the MySQL database server In the previous article, Inserting Multiple Entries with MySQL for Python, we learned about exception handling in Python. This article, Albert Lukaszewski, PhD, author of MySQL for Python, is a sequel of the previous article which discusses ways to handle errors and warnings that are passed from MySQL for Python and the differences between them. In this article we will specifically cover: Types of errors Customizing for catching Creating a feedback loop Project: Bad apples Read more about this book Types of Errors The followin
Python MySQL database connector for Python programming Brought to you by: adustman Summary Files Reviews Support Wiki MySQLdb1 MySQLdb2 MySQLdb-SVN Tickets ▾ Bugs Patches Feature Requests News Discussion Donate Browse Commits Fork Merge Requests 0 Forks 2 Branches default MySQLdb Tags tip [d55bfb]: MySQLdb / exceptions.py Maximize Restore History Download this file 118 lines (76 with data), 3.6 kB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117""" MySQLdb.exceptions ================== These classes are dictated by the DB API v2.0: http://www.python.org/topics/database/DatabaseAPI-2.0.html """ # from __future__ import absolute_import # Unfortunately, you cannot put the above in a conditional statement. # It would make things much cleaner for Python-2.5, but breaks older. try: from exceptions import Exception, StandardError, Warning except ImportError: import sys e = sys.modules['exceptions'] StandardError = e.StandardError Warning = e.Warning from MySQLdb.constants import ER class MySQLError(StandardError): """Exception related to operation with MySQL.""" class Warning(Warning, MySQLError): """Exception raised for important warnings like data truncations while inserting, etc.""" class Error(MySQLError): """Exception that is the base class of all other error exceptions (not Warning).""" class InterfaceError(Error): """Exception raised for errors that are related to the database interface rather than the database itself.""" class DatabaseError(Error): """Exception raised for errors that are related to the database.""" class DataError(DatabaseError): """Exception raised for errors that are due to problems with the processed data like division by zero, numeric value out of range, etc.""" class OperationalError(DatabaseError): """Exception raised for errors that are related to the database's operation and not necessarily under the control of the programmer, e.g. an unexpected disconnect occurs, the data source name is not found, a transaction could not be processed, a memory allocation error occurred during processing, etc.""" class IntegrityError(DatabaseError): """Exception raised when the relational integrity of the database is affect