This document provides instructions on how to connect to a MySQL database from Python. It demonstrates how to install the MySQL connector package, create a connection, execute SQL statements like CREATE DATABASE, CREATE TABLE, INSERT, SELECT, UPDATE, DELETE, LIMIT and DROP TABLE. Examples are given for each SQL statement along with the expected output.

1. PYTHON MYSQL

2. INSTALL CONNECTOR
At Anaconda prompt:
(base) C:Windowssystem32>python -m pip install -U pip
(base) C:Windowssystem32>pip install mysql
(base) C:Windowssystem32>pip install mysql-connector

3. TEST MYSQL CONNECTOR
To test if the installation was successful, or if you already have "MySQL Connector" installed,
create a Python page with the following content:
Eg:
File name - demo_mysql_test.py: contains code
import mysql.connector
Output: C:UsersMy Name>python demo_mysql_test.py
If the above code was executed with no errors, "MySQL Connector" is installed and ready to
be used.

4. CREATE CONNECTION
Start by creating a connection to the database.
Use the username and password from your MySQL database:
import mysql.connector
mydb = mysql.connector.connect( host="localhost", user="root", passwd=“ ")
print(mydb)
Output:<mysql.connector.connection.MySQLConnection object at
0x0000025AE384A5C0>
Now you can start querying the database using SQL statements.

5. CREATING A DATABASE
create a database named "mydatabase":
import mysql.connector
mydb = mysql.connector.connect( host="localhost", user="root",passwd=“amity")
mycur = mydb.cursor()
mycur.execute("CREATE DATABASE amity")
#If this page is executed with no error, you have successfully created a database.

6. CHECK IF DATABASE EXISTS
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd=“amity",
database="amity")
mycur=mydb.cursor()
mycur.execute("show databases")
for x in mycur:
print (x)
Output:
('information_schema',)
('amity',)
('mysql',)
('online_classes',)
('performance_schema',)
('sch',)
('school',)
('test',)

7. CREATING A TABLE
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd=“ ",
database="amity")
mycur=mydb.cursor()
print (mydb)
mycur.execute("create table student(admno int primary key, name char(20), address
varchar(30))")
#If this page is executed with no error, you have successfully created a table named
“student".

8. CHECK IF TABLE EXISTS
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd="",
database="amity")
mycur=mydb.cursor()
print (mydb)
mycur.execute("show tables")
for x in mycur:
print (x)
Output:
<mysql.connector.connection.MySQLConnection object at
0x0000025AE3820B38>
('student',)

9. ALTER TABLE
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd="",
database="amity")
mycur=mydb.cursor()
print (mydb)
mycur.execute("alter table student add phno int (10)")
mycur.execute("describe student")
for x in mycur:
print(x)
('admno', 'int(11)', 'NO', 'PRI', None, '')
('name', 'char(20)', 'YES', '', None, '')
('address', 'varchar(30)', 'YES', '', None, '')
('phno', 'int(10)', 'YES', '', None, '')

10. PYTHON MYSQL INSERT INTO TABLE
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd="",
database="amity")
mycur=mydb.cursor()
print (mydb)
sql="insert into student(admno,name,address,phno) values(%s,%s,%s,%s)"
val=(1,"monalisa","lajpat nagar",11111111)
mycur.execute(sql,val)
mydb.commit()
print(mycur.rowcount, "record inserted.")
Important!: Notice the statement: mydb.commit(). It is required to make the changes, otherwise no changes
are made to the table.
Output:
C:UsersMy Name>python demo_mysql_insert.py
1 record inserted.

11. INSERT MULTIPLE ROWS
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd="",
database="amity")
mycur=mydb.cursor()
print (mydb)
sql="insert into student(admno,name,address,phno) values(%s,%s,%s,%s)“
val= [ (3,"gggg","ln",4444),(4,"kkkk","malviyanagar",888888) ]
mycur.executemany(sql,val)
mydb.commit()
print(mycur.rowcount, "record inserted.")
Output:
2 record was inserted.

12. PYTHON MYSQL SELECT FROM
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd="",
database="amity")
mycur=mydb.cursor()
mycur.execute("select * from student")
for x in mycur:
print (x)
Output:
(1, 'monalisa', 'lajpat nagar', 11111111)
(2, 'monica', 'lajpat nagar', 2222222)
(3, 'gggg', 'ln', 4444)
(4, 'kkkk', 'malviyanagar', 888888)

13. USING THE FETCHONE() METHOD
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd="",
database="amity")
mycur=mydb.cursor()
mycur.execute("select * from student")
myresult = mycur.fetchone() # gets only one record
print(myresult)
Output:
C:UsersMy Name>python demo_mysql_select_fetchone.py
(1, 'John', 'Highway 21')

14. SELECT WITH A FILTER
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd="",
database="amity")
mycur=mydb.cursor()
mycur.execute("select * from student where address='malviyanagar'")
myresult = mycur.fetchall() # gets multiple records
print(myresult)
Output:
[(4, 'kkkk', 'malviyanagar', 888888), (6, 'kkkk', 'malviyanagar', 888888), (7, 'xxxxxx', 'malviyanagar', 9999999)]

15. PYTHON MYSQL DELETE
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd="",
database="amity")
mycur=mydb.cursor()
sql="delete from student where name=%s "
val=(“kkkk",)
mycur.execute(sql,val)
mydb.commit()
mycur.execute("select*from student ")
for x in mycur:
print (x)

16. UPDATE
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd="",
database="amity")
mycur=mydb.cursor()
mycur.execute("UPDATE student set name =‘GAUTAM' where admno=3")
mycur.execute("select * from student")
for x in mycur:
print (x)

17. MYSQL LIMIT
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd="",
database="amity")
mycur=mydb.cursor()
mycur.execute("select * from student LIMIT 2") # Shows only 2 records
for x in mycur:
print (x)

18. PYTHON
MYSQL DROP
TABLE
import mysql.connector
mydb=mysql.connector.connect
(host="localhost",
user="root",passwd="",
database="amity")
mycur=mydb.cursor()
sql="drop table if exists employee“ #
deletes the table
mycur.execute(sql)