Python Tutorial

Introduction Python Features Python Applications Python System requirements Python Installation Python Examples Python Basics Python Indentation Python Variables Python Data Types Python IDE Python Keywords Python Operators Python Comments Python Pass Statement

Python Conditional Statements

Python if Statement Python elif Statement Python If-else statement Python Switch Case

Python Loops

Python for loop Python while loop Python Break Statement Python Continue Statement Python Goto Statement

Python Arrays

Python Array Python Matrix

Python Strings

Python Strings Python Regex

Python Built-in Data Structure

Python Lists Python Tuples Python Lists vs Tuples Python Dictionary Python Sets

Python Functions

Python Function Python min() function Python max() function Python User-define Functions Python Built-in Functions Python Recursion Anonymous/Lambda Function in Python apply() function in python Python lambda() Function

Python File Handling

Python File Handling Python Read CSV Python Write CSV Python Read Excel Python Write Excel Python Read Text File Python Write Text File Read JSON File in Python

Python Exception Handling

Python Exception Handling Python Errors and exceptions Python Assert

Python OOPs Concept

OOPs Concepts in Python Classes & Objects in Python Inheritance in Python Polymorphism in Python Python Encapsulation Python Constructor Python Super function Python Static Method Static Variables in Python Abstraction in Python

Python Iterators

Iterators in Python Yield Statement In Python Python Yield vs Return

Python Generators

Python Generator

Python Decorators

Python Decorator

Python Functions and Methods

Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods

Python Modules

Python Modules Python Datetime Module Python Math Module Python Import Module Python Time ModulePython Random Module Python Calendar Module CSV Module in Python Python Subprocess Module

Python MySQL

Python MySQL Python MySQL Client Update Operation Delete Operation Database Connection Creating new Database using Python MySQL Creating Tables Performing Transactions

Python MongoDB

Python MongoDB

Python SQLite

Python SQLite

Python Data Structure Implementation

Python Stack Python Queue Python Linked List Python Hash Table Python Graph

Python Advance Topics

Speech Recognition in Python Face Recognition in Python Python Linear regression Python Rest API Python Command Line Arguments Python JSON Python Subprocess Python Virtual Environment Type Casting in Python Python Collections Python Attributes Python Commands Python Data Visualization Python Debugger Python DefaultDict Python Enumerate

Python 2

What is Python 2

Python 3

Anaconda in Python 3 Anaconda python 3 installation for windows 10 List Comprehension in Python3

How to

How to Parse JSON in Python How to Pass a list as an Argument in Python How to Install Numpy in PyCharm How to set up a proxy using selenium in python How to create a login page in python How to make API calls in Python How to run Python code from the command prompt How to read data from com port in python How to Read html page in python How to Substring a String in Python How to Iterate through a Dictionary in Python How to convert integer to float in Python How to reverse a string in Python How to take input in Python How to install Python in Windows How to install Python in Ubuntu How to install PIP in Python How to call a function in Python How to download Python How to comment multiple lines in Python How to create a file in Python How to create a list in Python How to declare array in Python How to clear screen in Python How to convert string to list in Python How to take multiple inputs in Python How to write a program in Python How to compare two strings in Python How to create a dictionary in Python How to create an array in Python How to update Python How to compare two lists in Python How to concatenate two strings in Python How to print pattern in Python How to check data type in python How to slice a list in python How to implement classifiers in Python How To Print Colored Text in Python How to open a file in python How to Open a file in python with Path How to run a Python file in CMD How to change the names of Columns in Python How to Concat two Dataframes in Python How to Iterate a List in Python How to learn python Online How to Make an App with Python How to develop a game in python How to print in same line in python How to create a class in python How to find square root in python How to import numy in python How to import pandas in python How to uninstall python How to upgrade PIP in python How to append a string in python How to comment out a block of code in Python How to change a value of a tuple in Python

Sorting

Python Sort List Sort Dictionary in Python Python sort() function Python Bubble Sort

Programs

Factorial Program in Python Prime Number Program in Python Fibonacci Series Program in Python Leap Year Program in Python Palindrome Program in Python Check Palindrome In Python Calculator Program in Python Armstrong Number Program in Python Python Program to add two numbers Anagram Program in Python Number Pattern Programs in Python Even Odd Program in Python GCD Program in Python Python Exit Program Python Program to check Leap Year Operator Overloading in Python Pointers in Python Python Not Equal Operator Raise Exception in Python Salary of Python Developers in India What is a Script in Python

Misc

Introduction to Scratch programming SKLearn Clustering SKLearn Linear Module Standard Scaler in SKLearn Python Time Library SKLearn Model Selection Standard Scaler in SKLearn Accuracy_score Function in Sklearn Append key Value to Dictionary in Python Cross Entropy in Python Cursor in Python Data Class in Python How to Install Tweepy in Python Imread Python Program of Cumulative Sum in Python Python Program for Linear Search Python Program to Generate a Random String Read numpy array in Python Scrimba python Sklearn linear Model in Python Scraping data in python Accessing Key-value in Dictionary in Python Find Median of List in Python Linear Regression using Sklearn with Example Problem-solving with algorithm and data structures using Python Python 2.7 data structures Python Variable Scope with Local & Non-local Examples Arguments and parameters in Python Assertion error in python Programs for Printing Pyramid Patterns in Python _name_ in Python Amazon rekognition using python Anaconda python 3.7 download for windows 10 64-bit Android apps for coding in python Augmented reality in python Best app for python Difference between Perl and Python Not supported between instances of str and int in python Python comment symbol Python Complex Class Python IDE names Selection Sort Using Python Hypothesis Testing in Python Idle python download for Windows Insertion Sort using Python Merge Sort using Python Python - Binomial Distribution Python Logistic Regression with Sklearn & Scikit Python Random shuffle() method Python variance() function Python vs HTML Removing the First Character from the String in Python Adding item to a python dictionary Best books for NLP with Python Best Database for Python Count Number of Keys in Dictionary Python Cross Validation in Sklearn Drop() Function in Python EDA in Python Excel Automation with Python Python Program to Find the gcd of Two Numbers Python Web Development projects Adding a key-value pair to dictionary in Python Python Euclidean Distance Python Filter List Python Fit Transform Python e-book free download Python email utils Python range() Function Python random.seed() function What is the re.sub() function in Python Python PPTX Python Pickle Python Seaborn Python Coroutine Python EOL Python Infinity Python math.cos and math.acos function Python Project Ideas Based On Django Reverse a String in Python Reverse a Number in Python Python Word Tokenizer Python Trigonometric Functions Python try catch exception GUI Calculator in Python Implementing geometric shapes into the game in python Installing Packages in Python Python Try Except Python Sending Email Socket Programming in Python Python CGI Programming Python Data Structures Python abstract class Python Compiler Python K-Means Clustering NSE Tools In Python Operator Module In Python Palindrome In Python Permutations in Python Pillow Python introduction and setup Python Functionalities of Pillow Module Python Argmin Python whois Python JSON Schema Python lock Return Statement In Python Reverse a sentence In Python tell() function in Python Why learn Python? Write Dictionary to CSV in Python Write a String in Python Binary Search Visualization using Pygame in Python Latest Project Ideas using Python 2022 Closest Pair of Points in Python ComboBox in Python Python vs R Best resources to learn Numpy and Pandas in python Check Letter in a String Python Python Console Python Control Statements Convert Float to Int in Python using Pandas Difference between python list and tuple Importing Numpy in Pycharm Python Key Error Python NewLine Python tokens and character set Python Strong Number any() Keyword in python Best Database in Python Check whether dir is empty or not in python Comments in the Python Programming Language Convert int to Float in Python using Pandas Decision Tree Classification in Python End Parameter in python __GETITEM__ and __SETITEM__ in Python Python Namespace Python GUI Programming List Assignment Index out of Range in Python List Iteration in Python List Index out of Range Python for Loop List Subtract in Python Python Empty Tuple Python Escape Characters Sentence to python vector Slicing of a String in Python Executing Shell Commands in Python Genetic Algorithm in python Get index of element in array in python Looping through Data Frame in Python Syntax of Map function in Python After Python What Should I Learn Python AIOHTTP Alexa Python Artificial intelligence mini projects ideas in python Artificial intelligence mini projects with source code in Python Find whether the given stringnumber is palindrome or not First Unique Character in a String Python Python Network Programming Python Interface Python Multithreading Python Interpreter Data Distribution in python Flutter with tensor flow in python Front end in python Iterate a Dictionary in Python Iterate a Dictionary in Python – Part 2 Allocate a minimum number of pages in python Assertion Errors and Attribute Errors in Python Checking whether a String Contains a Set of Characters in python Python Control Flow Statements *Args and **Kwargs in Python Bar Plot in Python Conditional Expressions in Python Function annotations() in Python How to Write a Configuration file in Python Image to Text in python import() Function in Python Import py file in Python Multiple Linear Regression using Python Nested Tuple in Python Python String Negative Indexing Reading a File Line by Line in Python Python Comment Block Base Case in Recursive function python ER diagram of the Bank Management System in python Image to NumPy Arrays in Python NOT IN operator in Python One Liner If-Else Statements in Python Sklearn in Python Cube Root in Python Python Variables, Constants and Literals What Does the Percent Sign (%) Mean in Python Creating Web Application in python Notepad++ For Python PyPi TensorFlow Python | Read csv using pandas.read_csv() What is online python free IDE What is Python online compiler Run exec python from PHP What are the Purposes of Python What is Python compiler GDB Python coding platform Python Classification Python | a += b is not always a = a + b PyDev with Python IDE Character Set in Python Best Python AI Projects _dict_ in Python Python Ternary Operators Self in Python Python vs Java Python Modulo Python Packages Python Syntax Python Uses Python Bitwise Operators Python Identifiers Python Matrix Multiplication Python AND Operator Python Logical Operators Python Multiprocessing Python Unit Testing __init__ in Python Advantages of Python Is Python Case-sensitive when Dealing with Identifiers Python Boolean Python Call Function Python History Python Image Processing Python main() function Python Permutations and Combinations Difference between Input() and raw_input() functions in Python Conditional Statements in python Confusion Matrix Visualization Python Nested List in Python Python Algorithms Python Modules List Difference between Python 2 and Python 3 Is Python Case Sensitive Method Overloading in Python Python Arithmetic Operators Assignment Operators in Python Is Python Object Oriented Programming language Python Division Python exit commands Continue And Pass Statements In Python Colors In Python Convert String Into Int In Python Convert String To Binary In Python Convert Uppercase To Lowercase In Python Convert XML To JSON In Python Converting Set To List In Python Covariance In Python CSV Module In Python Decision Tree In Python Difference Between Yield And Return In Python Dynamic Typing In Python BOTTLE Python Web Framework How to Install Scikit-Learn Introducing modern python computing in simple packages Python vs PHP Reason for Python So Popular Returning Multiple Values in Python Spotify API in Python Spyder (32-bit) - Free download Time. Sleep() in Python Traverse Dictionary in Python What is Ipython shell YOLO Python Nested for Loop in Python Data Structures and Algorithms Using Python | Part 1 Data Structures and Algorithms using Python | Part 2 ModuleNotFoundError No module named 'mysql' in Python N2 in Python XGBoost for Regression in Python

Python MySQL Update Operation

Python MySQL Update Operation: In this part of tutorial, we will learn that how can we update a table present in SQL database through our Python program. As like SQL, we can modify, rewrite or update any specific field in a table using Python program. We just need to specify the primary ID of the specific field which we want to update in the table.

Syntax: Following is the syntax that we will use in our Python program to update any specific field of table:

UPDATE-SET

In the above given syntax, we have to give two arguments to update the table. Following are the two arguments which we need to specify while using UPDATE-SET method:

1. Table Name: We have to write the name of the specific table that we want to update after 'UPDATE' keyword to define the table in our Python program.

2. Column Name: After 'SET' keyword we have to write column name from where we want to enter the particular field. We can also use more than one column name after SET keyword to edit more than one field of table at once.

Now, we will use this update method on our 'StudentTable' to edit the Name and Stream Name columns in two different examples. We will use the following syntax with the UPDATE-SET method in these two examples:

> update StudentTable set ColumnName = 'NewEntry' where id = ID

Consider the following two examples:

Example 1: Updating the name where ID = 2402 from StudentTable using UPDATE-SET method:

 # import the mysql.connector module
 import mysql.connector
 # create the connection object with database
 MyConnectionObject = mysql.connector.connect(host = "localhost", user = "root",passwd = "2401", database = "OurPython1stDB")
 # print the defined connection object
 print(MyConnectionObject)
 # define the cursor object with cursor() function
 CursorObject = MyConnectionObject.cursor()
 # print the defined cursor object
 print(CursorObject)
 # use UPDATE-SET method in try and catch method
 try: 
     CursorObject.execute("update Studenttable set name = 'Delta' where id = 2402") # Name column where ID = 2402 updated in the table
     MyConnectionObject.commit() # it commits the updation in the StudentTable
     print(“The Name field of StudentTable where id = 2402 is successfully updated.")
 except: 
     MyConnectionObject.rollback()
 # print the updated table using fetchall() function on cursorobject
 CursorObject.execute("SELECT * FROM StudentTable")
 ResultOutput = CursorObject.fetchall()
 # print the updted table with for loop
 for z in ResultOutput:
   print(z)
 # close the connection using close() function
 MyConnectionObject.close() 

Output:

 <mysql.connector.connection.MySQLConnection object at 0x000002A192C87CD0>
 MySQLCursor: (Nothing executed yet)
 The Name field of StudentTable where id = 2402 is successfully updated.
 ('Jonas', 2401, 'Science', 'A', 'Physics')
 ('Delta', 2402, 'Science', 'A', 'Physics')
 ('Lyon', 2509, 'Science', 'B', 'Maths')
 ('James', 2601, 'Science', 'E', 'Chemistry')
 ('Peter', 2703, 'Science', 'C', 'Biology')
 ('Jonathan', 2901, 'Science', 'E', 'Biology') 

Example 2: Updating the Major name from StudentTable where ID = 2901 using UPDATE-SET method:

 # import the mysql.connector module
 import mysql.connector
 # create the connection object with database
 MyConnectionObject = mysql.connector.connect(host = "localhost", user = "root",passwd = "2401", database = "OurPython1stDB")
 # print the defined connection object
 print(MyConnectionObject)
 # define the cursor object with cursor() function
 CursorObject = MyConnectionObject.cursor()
 # print the defined cursor object
 print(CursorObject)
 # use UPDATE-SET method in try and catch method
 try: 
     CursorObject.execute("update Studenttable set major = 'Biotechnology' where id = 2901") # Major column where ID = 2901 updated in the table
     MyConnectionObject.commit() # it commits the updation in the StudentTable
     print("The major field of StudentTable where id = 2901 is successfully updated.")
 except: 
     MyConnectionObject.rollback()
 # print the updated table using fetchall() function on cursorobject
 CursorObject.execute("SELECT * FROM StudentTable")
 ResultOutput = CursorObject.fetchall()
 # print the updted table with for loop
 for z in ResultOutput:
   print(z)
 # close the connection using close() function
 MyConnectionObject.close() 

Output:

 <mysql.connector.connection.MySQLConnection object at 0x000001F62D187CD0>
 MySQLCursor: (Nothing executed yet)
 The Stream field of StudentTable where id = 2901 is successfully updated.
 ('Jonas', 2401, 'Science', 'A', 'Physics')
 ('Delta', 2402, 'Science', 'A', 'Physics')
 ('Lyon', 2509, 'Science', 'B', 'Maths')
 ('James', 2601, 'Science', 'E', 'Chemistry')
 ('Peter', 2703, 'Science', 'C', 'Biology')
 ('Jonathan', 2901, 'Science', 'E', 'Biotechnology') 

Explanation:

In the above two examples, we have first imported mysql.connector module in our Python program to access MySQL database. Then, we have defined a connection object named 'MyConnectionObject' in the program. We have used connect() method on 'MyConnectionObject' with specifying the database.

Then, we have printed the connection object we have defined. After that, we have used cursor() function to define a cursor object in the program with name CursorObject. After that we have printed the cursor object. Then, we used Try and catch method in our program to use the UPDATE-SET method. Then we used the execute() function with the CursorObject and after that we have used CURSER-SET method with the where clause i.e., where ID = 2402 or 2901.

Using where clause after SET keyword specifically indicates which field we want to update in the table. In the first example we updated name of student have ID = 2402 and in second example we update stream of student have ID = 2901. Then, we used commit() function with connection object to commit this updation in the table in database.

After that, we have closed 'try and catch' method using the rollback() function with MyConnectionObject in catch statement. Then, we have used fetchall() function with the cursor object to define the ResultOutput through which we will print the updated table in the output of the program.

We used ResultOutput inside the for loop in our program so that we can easily print updated table as output of program. Then, we closed the connection with database using close() function with MyConnectionObject. Output will be printed after Python successfully run the program and access the database.

  • We can use UPDATE-SET method in any Python program like this we have used in above two examples to update any field from a given SQL table. We just have to specify the table name and column name where we want to make the change.



ADVERTISEMENT
ADVERTISEMENT