PYTHON MYSQL DELETE

M
YSQL DELETE
Delete Record
You can delete records from an existing table by using the "DELETE FROM" statement:

import mysql.connector

mydb = mysql.connector.connect(
host="localhost",
user="yourusername",
password="yourpassword",
database="mydatabase"
)
mycursor = mydb.cursor()
sql = "DELETE FROM customers WHERE address = 'Mountain 21'"
mycursor.execute(sql)

mydb.commit()
print(mycursor.rowcount, "record(s) deleted")

1 record(s) deleted

Important!: Notice the statement: mydb.commit(). It is required to make the changes, otherwise no changes are made to the table
Notice the WHERE clause in the DELETE syntax: The WHERE clause specifies which record(s) that should be deleted. If you omit the WHERE clause, all records will be deleted!

Prevent SQL Injection
It is considered a good practice to escape the values of any query, also in delete statements.
This is to prevent SQL injections, which is a common web hacking technique to destroy or misuse your database.
The mysql.connector module uses the placeholder %s to escape values in the delete statement: Escape values by using the placeholder %s method:

import mysql.connector

mydb = mysql.connector.connect(
host="localhost",
user="yourusername",
password="yourpassword",
database="mydatabase"
)
mycursor = mydb.cursor()
sql = "DELETE FROM customers WHERE address = %s"
adr = ("Yellow Garden 2", )
mycursor.execute(sql, adr)
mydb.commit()
print(mycursor.rowcount, "record(s) deleted")

1 record(s) deleted