Home > python raise > python raise database error

Python Raise Database Error

Contents

— PyMOTW 3 gettext — Message Catalogs — PyMOTW 3 copy — Duplicate Objects — PyMOTW 3 LinksAbout Me Python Module of the Week The Python Standard Library by Example Long Form Posts Presentations Book Reviews Archives Archives Select Month python raise runtime error October 2016 September 2016 August 2016 July 2016 June 2016 May 2016 April 2016 March python raise runtimeerror 2016 February 2016 January 2016 November 2015 September 2015 August 2015 July 2015 June 2015 May 2015 April 2015 March 2015 January 2015

Python Mysqldb Error Handling

December 2014 November 2014 October 2014 September 2014 August 2014 July 2014 June 2014 May 2014 April 2014 March 2014 February 2014 January 2014 December 2013 November 2013 October 2013 September 2013 August 2013 July 2013 June 2013

Python Exception Handling Best Practices

May 2013 April 2013 March 2013 February 2013 January 2013 December 2012 November 2012 October 2012 September 2012 August 2012 June 2012 May 2012 April 2012 March 2012 February 2012 January 2012 December 2011 November 2011 October 2011 September 2011 August 2011 July 2011 June 2011 May 2011 April 2011 March 2011 February 2011 December 2010 October 2010 September 2010 August 2010 July 2010 June 2010 May 2010 April 2010 March 2010 February 2010 January 2010 December python raise runtime error example 2009 November 2009 October 2009 September 2009 August 2009 July 2009 June 2009 May 2009 April 2009 March 2009 February 2009 January 2009 December 2008 November 2008 October 2008 September 2008 August 2008 July 2008 June 2008 May 2008 April 2008 March 2008 February 2008 January 2008 December 2007 November 2007 October 2007 September 2007 August 2007 July 2007 June 2007 May 2007 April 2007 March 2007 February 2007 January 2007 December 2006 Python Exception Handling Techniques

Error reporting and processing through exceptions is one of Python’s key features. Care must be taken when handling exceptions to ensure proper application cleanup while maintaining useful error reporting. Error reporting and processing through exceptions is one of Python’s key features. Unlike C, where the common way to report errors is through function return values that then have to be checked on every invocation, in Python a programmer can raise an exception at any point in a program. When the exception is raised, program execution is interrupted as the interpreter searches back up the stack to find a context with an exception handler. This search algorithm allows error handling to be organized cleanly in a central or high-level place within the program structure. Libraries may not need to do any exception handling at all, and simple scripts can frequently get away with wrapping a portion of the main program

is 'module.Error'. In MySQL it is 'MySQLdb.Error'. Every DB-API https://doughellmann.com/blog/2009/06/19/python-exception-handling-techniques/ statement that you execute has the potential to raise an exception. So any time you execute a database query you should surround it http://www.mikusa.com/python-mysql-docs/exceptions.html with a try/exception block. This includes connections, cursor requests, and statement executions. # Get data from database try: cur.execute("SELECT * FROM song") rows = cur.fetchall() except MySQLdb.Error, e: try: print "MySQL Error [%d]: %s" % (e.args[0], e.args[1]) except IndexError: print "MySQL Error: %s" % str(e) # Print results in comma delimited format for row in rows: for col in row: print "%s," % col print "\n" <-- Home -->

implement some mechanism to handle errors gracefully.MySQLdb has MySQLdb.Error  exception, a top level exception that can be used to catch all database exception raised by MySQLdb http://thepythonguru.com/handling-errors/ module. from __future__ import print_function import MySQLdb as my try: db = my.connect(host="127.0.0.1", user="root", passwd="", db="world" ) cursor = db.cursor() sql = "select * from city" number_of_rows = cursor.execute(sql) print(number_of_rows) db.close() except my.Error as e: print(e) except : print("Unknown error occurred")123456789101112131415161718192021222324from __future__ import print_functionimport MySQLdb as mytry:db = my.connect(host="127.0.0.1",user="root",passwd="",db="world")cursor = db.cursor()sql = "select * from city"number_of_rows = python raise cursor.execute(sql)print(number_of_rows)db.close()except my.Error as e:print(e)except :print("Unknown error occurred") Two main error in MySQLdbThere are two categories of exception class in MySQLdb you need to be aware:DatabaseError.InterfaceError.DatabaseError: This exception raises when there is problem in data processing, error in sql syntax, mysql internal problems. If a connection is made and a problem arises then DatabaseError will catch it. There are python raise runtime 6 types of DatabaseError:DataError.InternalError.IntegrityError.OperationalError.NotSupportedError.ProgrammingError.DataError: MySQLdb throws this error when there is problem in the data processing, like division by zero, numeric value of of range.InternalError: This exception is raised when there is some internal error in MySQL database itself. For e.g invalid cursor, transaction out of sync etc.IntegrityError: This exception is raised when foreign key check fails.OperationalError: This exception is raised for things that are not in control of the programmer. For e.g unexpected disconnect, error in memory allocation etc, selected database not exists.NotSupportedError: This exception is raised when there is method or api that is not supported.ProgrammingError: This exception is raised of programming errors. For e.g table not found, error in mysql syntax, wrong number of parameters specified etc.InterfaceError: When database connection fails for some reason, MySQLdb will raise an InterfaceError. Note InterfaceError only get raise when there is internal problem in connection to the database, MySQLdb will not raise InterfaceError because of wrong database name or password. from __future__ import print_function import MySQLdb as my try: db = my.c

 

Related content

attribute error print

Attribute Error Print table id toc tbody tr td div id toctitle Contents div ul li a href Python Typeerror a li li a href Python Raise Typeerror a li li a href Python Attributeerror Object Has No Attribute a li li a href Python Errno a li ul td tr tbody table p here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies relatedl of this site About Us Learn more about Stack Overflow the p h id Python Typeerror p company Business Learn more

error raise python

Error Raise Python table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Valueerror a li li a href Python Exception Class a li li a href Python Raise Error But Continue a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors syntax errors and exceptions Syntax Errors Syntax errors also known as relatedl parsing errors are perhaps the most common kind of complaint you python raise exception get while you are still learning Python while True print 'Hello world' File

python catch database error

Python Catch Database Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Runtime Error a li li a href Python Exception Handling Best Practices a li li a href Python Raise Exception Without Traceback a li li a href Python Runtime Error Example a li ul td tr tbody table p here for a quick overview of the site Help Center Detailed answers to any questions you might relatedl have Meta Discuss the workings and policies of this p h id Python Raise Runtime Error p site About Us Learn more

python except database error

Python Except Database Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Runtime Error a li li a href Python Raise Runtimeerror a li li a href Mysqldb Error Codes a li li a href Python Pass Exception To Calling Function a li ul td tr tbody table p is 'module Error' In MySQL it is 'MySQLdb Error' Every DB-API pymysql error handling statement that you execute has the potential to raise an exception So any time you execute a database query you should surround it python exception handling best practices

python invoke error

Python Invoke Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Custom Exception a li li a href Python Raise Valueerror a li li a href Python Raise Exception With Message a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors syntax errors and exceptions Syntax Errors Syntax errors also known relatedl as parsing errors are perhaps the most common kind of python error types complaint you get while you are still learning Python while True print 'Hello world'

python print error type

Python Print Error Type table id toc tbody tr td div id toctitle Contents div ul li a href Python Exception Get Message a li li a href Python Try Except Pass a li li a href Catch Multiple Exceptions Python a li li a href Python Raise Custom Exception a li ul td tr tbody table p here for a quick overview of the site Help Center Detailed answers to any questions relatedl you might have Meta Discuss the workings and policies p h id Python Exception Get Message p of this site About Us Learn more about Stack

python raise error

Python Raise Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Custom Exception a li li a href Syntax For Generic Except Clause In Python a li li a href Is Nested Try Block Possible In Python a li li a href Python Try Except Else a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors syntax errors and exceptions Syntax relatedl Errors Syntax errors also known as parsing errors are perhaps p h id Python Raise Custom Exception

python raise an error

Python Raise An Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Custom Exception a li li a href Syntax For Raise Clause In Python a li li a href Python Exception Message a li li a href Python Print Exception a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors syntax errors and exceptions Syntax Errors Syntax errors also known as parsing errors relatedl are perhaps the most common kind of complaint you get while p h id

python raise argument error

Python Raise Argument Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Exception Message a li li a href Python Custom Exception a li li a href What Is The Argument Of An Exception In Python Quiz a li ul td tr tbody table p here for a quick overview of the site Help Center Detailed answers to relatedl any questions you might have Meta Discuss the python argparse argumenterror workings and policies of this site About Us Learn more about Stack python raise valueerror Overflow the company Business Learn more about

python raise custom error

Python Raise Custom Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Exception Message a li li a href Syntax For Raise Clause In Python a li ul td tr tbody table p here for a quick overview of the site Help Center Detailed relatedl answers to any questions you might have Meta python exception class Discuss the workings and policies of this site About Us Learn python raise valueerror more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us syntax for generic except clause

python raise error string

Python Raise Error String table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Custom Exception a li li a href Python Exception Message a li li a href Python Exception Stack Trace a li ul td tr tbody table p 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 relatedl site About Us Learn more about Stack Overflow the company python error types Business Learn more about hiring developers or posting ads with us Stack

python raise error syntax

Python Raise Error Syntax table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Valueerror a li li a href Syntax For Generic Except Clause In Python a li li a href Python Exception Message a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors syntax errors and exceptions Syntax Errors Syntax relatedl errors also known as parsing errors are perhaps the most python error types common kind of complaint you get while you are still learning Python while python raise

python raise error example

Python Raise Error Example table id toc tbody tr td div id toctitle Contents div ul li a href Syntax For Generic Except Clause In Python a li li a href Python Exception Message a li li a href Is Nested Try Block Possible In Python a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors syntax errors and exceptions Syntax relatedl Errors Syntax errors also known as parsing errors are perhaps python raise custom exception the most common kind of complaint you get while you are still

python raise string error

Python Raise String Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Custom Exception a li li a href Syntax For Generic Except Clause In Python a li li a href Is Nested Try Block Possible In Python a li li a href Python Raise Generic Exception a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors syntax errors and exceptions Syntax Errors Syntax relatedl errors also known as parsing errors are perhaps the most p h id Python

python raise error with traceback

Python Raise Error With Traceback table id toc tbody tr td div id toctitle Contents div ul li a href Python Reraise Exception a li li a href Python Re Raise Exception With Message a li ul td tr tbody table p 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 relatedl About Us Learn more about Stack Overflow the company Business Learn python exception chaining more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags python

python raise connection error

Python Raise Connection Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Custom Exception a li li a href Python Programming Can Handle Every Error Implicitly A True B False a li li a href Python Connectionerror a li ul td tr tbody table p here for a quick overview of the site Help Center Detailed answers to any relatedl questions you might have Meta Discuss the workings and valueerror python policies of this site About Us Learn more about Stack Overflow the p h id Python Custom Exception p company Business

python raise error code

Python Raise Error Code table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Custom Exception a li li a href Python Raise Valueerror a li li a href Syntax For Raise Clause In Python a li li a href Python Exception Stack Trace a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors relatedl syntax errors and exceptions Syntax Errors Syntax python error types errors also known as parsing errors are perhaps the most common kind p h id Python

python raise error and continue

Python Raise Error And Continue table id toc tbody tr td div id toctitle Contents div ul li a href Python Warnings a li li a href Python Continue Loop After Exception a li li a href Pythonwarnings a li ul td tr tbody table p 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 relatedl Overflow the company Business Learn more about hiring developers or posting ads python warning example with us Stack Overflow Questions

python raise error but continue

Python Raise Error But Continue table id toc tbody tr td div id toctitle Contents div ul li a href Python Warnings a li li a href Python Raise Warning And Continue a li li a href Python Warning a li ul td tr tbody table p here for a quick overview of the site Help Center Detailed answers to any questions you relatedl might have Meta Discuss the workings and policies of python raise exception and continue this site About Us Learn more about Stack Overflow the company Business Learn python warning example more about hiring developers or posting

python raise error with message

Python Raise Error With Message table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Valueerror a li li a href Python Exception Message a li li a href Python Exception Stack Trace a li li a href Python Print Exception a li ul td tr tbody table p here for a quick overview of the site Help Center Detailed answers to any questions you might have relatedl Meta Discuss the workings and policies of this site python raise custom exception About Us Learn more about Stack Overflow the company Business Learn more

python raise error tutorial

Python Raise Error Tutorial table id toc tbody tr td div id toctitle Contents div ul li a href Python Exception Message a li li a href Python Raise Custom Exception a li li a href Python Exception Stack Trace a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors syntax errors and exceptions relatedl Syntax Errors Syntax errors also known as parsing errors python error types are perhaps the most common kind of complaint you get while you are still syntax for generic except clause in python

python raise user defined error

Python Raise User Defined Error table id toc tbody tr td div id toctitle Contents div ul li a href Syntax For Generic Except Clause In Python a li li a href Is Nested Try Block Possible In Python a li li a href Python Print Exception a li ul td tr tbody table p you have probably seen some There are at least two distinguishable relatedl kinds of errors syntax errors and exceptions python raise custom exception Syntax Errors Syntax errors also known as parsing errors are perhaps python error types the most common kind of complaint you get

python raising a custom error

Python Raising A Custom Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Custom Exception a li li a href Syntax For Generic Except Clause In Python a li li a href Python Exception Message a li li a href Python Raise Exception With Message a li ul td tr tbody table p 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 relatedl site About Us Learn more about Stack Overflow the company Business

python raise user error

Python Raise User Error table id toc tbody tr td div id toctitle Contents div ul li a href Syntax For Generic Except Clause In Python a li li a href Python Exception Message a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors syntax errors and relatedl exceptions Syntax Errors Syntax errors also known as parsing python error types errors are perhaps the most common kind of complaint you get while you python raise custom exception are still learning Python while True print 'Hello world' File stdin

python raise syntax error

Python Raise Syntax Error table id toc tbody tr td div id toctitle Contents div ul li a href Syntax For Raise Clause In Python a li li a href Python Exception Message a li ul td tr tbody table p you have probably seen some There are at least two distinguishable relatedl kinds of errors syntax errors and exceptions python error types Syntax Errors Syntax errors also known as parsing errors are perhaps the python raise custom exception most common kind of complaint you get while you are still learning Python while True print 'Hello python raise valueerror world'

python script throw error

Python Script Throw Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Custom Exception a li li a href Syntax For Generic Except Clause In Python a li li a href Python Exception Message a li li a href Is Nested Try Block Possible In Python a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors syntax errors and exceptions Syntax relatedl Errors Syntax errors also known as parsing errors are perhaps python error types the most common kind

python trigger error

Python Trigger Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Error Types a li li a href Custom Exception Python a li li a href Python Raise Exception With Custom Message a li li a href Python Raise Exception And Exit a li ul td tr tbody table p 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 relatedl this site About Us Learn more about Stack Overflow the company p h id Python Error

python 3 standard error

Python Standard Error table id toc tbody tr td div id toctitle Contents div ul li a href Valueerror Python a li li a href Python Raise Custom Exception a li li a href Syntax For Generic Except Clause In Python a li li a href Python Try Except Else a li ul td tr tbody table p a span class pre try span statement with an span class pre except span clause that mentions a particular class relatedl that clause also handles any exception classes derived from p h id Valueerror Python p that class but not exception classes

python database error handling

Python Database Error Handling table id toc tbody tr td div id toctitle Contents div ul li a href Python Raise Runtime Error a li li a href Python Exception Handling Best Practices a li li a href Python Pass Exception To Calling Function a li li a href Python Excepthook a li ul td tr tbody table p PyMOTW gettext Message Catalogs PyMOTW copy Duplicate Objects PyMOTW LinksAbout Me Python Module relatedl of the Week The Python Standard Library by Example Long p h id Python Raise Runtime Error p Form Posts Presentations Book Reviews Archives Archives Select Month

raise exception error

Raise Exception Error table id toc tbody tr td div id toctitle Contents div ul li a href Python Exception Message a li li a href Python Raise Valueerror a li li a href Python Print Exception a li ul td tr tbody table p you have probably seen some There are at least two distinguishable kinds of errors syntax errors and exceptions relatedl Syntax Errors Syntax errors also known as parsing errors python error types are perhaps the most common kind of complaint you get while you are python raise custom exception still learning Python while True print 'Hello

raise-syntax-error

Raise-syntax-error table id toc tbody tr td div id toctitle Contents div ul li a href Python Error Types a li li a href Python Raise Custom Exception a li li a href Python Raise Valueerror a li li a href Python Exception Message a li ul td tr tbody table p Operations Running RacketBibliographyIndex Control Flow Multiple Values Exceptions Delayed Evaluation Continuations Continuation Marks Breaks Exiting Exceptions Raising Exceptions Handling Exceptions Configuring Default Handling Built-in Exception TypesOn this page Raising Exceptionsraiseerrorraise-user-errorraise-type-errorraise-mismatch-errorraise-arity-errorraise-syntax-error Handling Exceptionscall-with-exception-handleruncaught-exception-handlerwith-handlerswith-handlers Configuring Default Handlingerror-escape-handlererror-display-handlererror-print-widtherror-print-context-lengtherror-value- string-handlererror-print-source-location Built-in Exception Typesexnexn failexn relatedl fail contractexn fail contract arityexn fail p