Python MySQL Delete From By
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Python MySQL Delete From By
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Delete Record
You can delete records from an existing table by using the "DELETE FROM" statement:
Example
Delete any record where the address is "Mountain 21":
import mysql.connector
mydb = mysql.connector.connect(
host="localhost",
user="yourusername",
passwd="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")
Run example »
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:
Example
Escape values by using the placeholder %s
method:
import mysql.connector
mydb = mysql.connector.connect(
host="localhost",
user="yourusername",
passwd="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")Run example »
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