python-mysqlHow do I use Python to handle MySQL NULL values?

Python has a built-in module called MySQLdb that can be used to handle MySQL NULL values. To use it, you need to first import it:

import MySQLdb

Then, you can use the MySQLdb.NULL object to check for NULL values in the database. For example, the following code will check for NULL values in the name column of a user table:

# Connect to the database
db = MySQLdb.connect(host="localhost", user="user", passwd="passwd", db="dbname")

# Create a cursor object
cursor = db.cursor()

# Execute the SQL query
cursor.execute("SELECT * FROM user WHERE name IS NULL")

# Fetch the results
results = cursor.fetchall()

# Print the results
print(results)

The output of the code will be a list of tuples containing the rows in the table where the name column is NULL.

The MySQLdb.NULL object can also be used to insert or update NULL values in the database. For example, the following code will insert a row with a NULL value in the name column:

# Connect to the database
db = MySQLdb.connect(host="localhost", user="user", passwd="passwd", db="dbname")

# Create a cursor object
cursor = db.cursor()

# Execute the SQL query
cursor.execute("INSERT INTO user (name) VALUES (%s)", (MySQLdb.NULL,))

# Commit the changes
db.commit()

This code will insert a row with a NULL value in the name column.

• import MySQLdb: imports the MySQLdb module
• db = MySQLdb.connect(host="localhost", user="user", passwd="passwd", db="dbname"): connects to the database
• cursor = db.cursor(): creates a cursor object
• cursor.execute("SELECT * FROM user WHERE name IS NULL"): executes an SQL query to select all rows where the name column is NULL
• results = cursor.fetchall(): fetches the results of the query
• cursor.execute("INSERT INTO user (name) VALUES (%s)", (MySQLdb.NULL,)): executes an SQL query to insert a row with a NULL value in the name column
• db.commit(): commits the changes to the database

Helpful links

• MySQLdb Documentation
• Python MySQL Tutorial

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