Python MySQL – Where Clause
Where clause is used in MySQL database to filter the data as per the condition required. You can fetch, delete or update a particular set of data in MySQL database by using where clause.
Syntax
SELECT column1, column2, …. cloumnN FROM [TABLE NAME] WHERE [CONDITION];
The above syntax is used for displaying a certain set of data following the condition.
Example: Consider the following database named college and having a table name as a student.
Schema of the database:
Database:
Where Clause In Python
Steps to use where clause in Python is:
- First form a connection between MySQL and Python program. It is done by importing mysql.connector package and using
mysql.connector.connect()method, for passing the user name, password, host (optional default: localhost) and, database (optional) as parameters to it. - Now, create a cursor object on the connection object created above by using
cursor()method. A database cursor is a control structure that enables traversal over the records in a database. - Then, execute the where clause statement by passing it through
execute()method.
import mysql.connector #Establishing connection conn = mysql.connector.connect(user='your_username', host='localhost', password ='your_password', database='College') # Creating a cursor object using # the cursor() method mycursor = conn.cursor(); # SQL Query sql = "select * from Student where Roll_no >= 3;" # Executing query mycursor.execute(sql) myresult = mycursor.fetchall() for x in myresult: print(x) # Closing the connection conn.close() |
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OUTPUT:
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