Interfacing python to mysql (11363255151).pptx
- 1. INTERFACING PYTHON TO MYSQL CLASS-XII
- 2. Before we start let us know bit about MYSQL MySQL is the most popular open Source Relational SQL Database Management System. Features: It is written in C and C++. MySQL is quicker than other databases so it can work well even with the large data set. MySQL supports many operating systems with many languages like PHP,PERL,C,C++,JAVA etc. MySQL uses a standard form of well-known SQL data language. MySQL is an open-source database, so it is available free of cost.
- 3. Interface python with SQL DB All companies whether large or small use data bases. So it become necessary to develop project/software using any programming language like python in such a manner which can interface with such databases which support SQL
- 4. Steps to connect python to MySQL DB 1. Install MySQL connector drivers. 2. Import Mysql . connector module 3. Create a connection object. 4. Create a cursor instance. 5. Execute a query. 6. Extract data from the resultset. 7. Clean up the environment.
- 5. Connecting to MySQL From Ptyhon MySQL python connector :- To access the MySQL database from python, you need a database driver. Mysql connector is a standardize database driver provided by MySQL. Step 1.Open command window and Install MySQL Drivers through pip command. Pip install mysql-connector
- 6. Check whether MySQL-Connector is installed properly Step 2. Import drivers in python IDLE i. Open Python IDLE ii. Type import mysql . connector If no error occures,it means mysql-connector is working properly
- 7. Creating the connection : connect() Step-3. Pass the database details like hostname, username and database password in the method call. the method returns the connection object: Output given below shows no error in connection Or use following command to check connection is successful or not mydb=mysql . connector. connect(host="localhost", user="root", passwd = "root") print(mydb)
- 8. Step 4. To have multiple separate working environment through the same connection to the database. Database cursor can be created to traverse the resultset(set of records retrieved as per query) row by row. Cursor instance can be created by using cursor() as follow: Syntax - <cur_obj>=conn.cursor() e.g. - mycursor= mydb. Cursor() Note: We need a cursor to execute our MySQL queries Creating Cursor
- 9. Execute sql quary Step 5 . Execute sql quary Mycursor= mydb. cursor() Mycursor.execute(‘CREATE DATABASE school’) # Data base Created
- 10. Step 6.Extract data from Resultset: Extract data from Resultset # list the all databases created
- 11. Creating Table
- 12. Extract data from resultset Fetchall():- Displaying all records. Fetch all (remaining) rows of a query result, returning them as a sequence(e.g. a list of tuples). Output:
- 13. •It will display no of records fetched after running. Cursor.rowcount()
- 14. More Functions cursor . fetchall(): fetches all the rows of a query result. it returns all the rows as a list of tuples.An empty list is returned if there is no record to fetch. cursor . fetchmany(size): returns the number of rows specified by the size argument. when called repeatedly this method fetches the next set of rows of a query result and returns a list of tuples.if no more rows are available, it reruns an empty list. cursor . fetchone(): returns a single record or none if no more rows are available.
- 15. Clean up the Environment After doing all the processing in this final step, you need to close the connection established. BY using following command:- mycursor. Close()
- 16. Parameterised Queries String templates with % formatting
- 17. String formatting with .format() Parameterised Queries
- 18. Performing insert and update queries Always commit() after executing insert and update queries. Syntax:- connectionboject.commit() 1.INSERT:
- 19. Performing insert and update queries 2.UPDATE