Python Delete Data Codes

Certainly! Here’s an example of Python code that demonstrates how to delete data from a PostgreSQL database using the psycopg2 library:

import psycopg2

# Connect to the PostgreSQL database
conn = psycopg2.connect(
    host="localhost",
    database="your_database",
    user="your_username",
    password="your_password"
)

# Create a cursor
cursor = conn.cursor()

# Define the SQL statement with a placeholder
sql = "DELETE FROM your_table WHERE condition_column = %s"

# Set the value used in the condition
condition_value = "ConditionValue"

try:
    # Execute the SQL statement with the condition value
    cursor.execute(sql, (condition_value,))

    # Get the number of rows affected
    rows_deleted = cursor.rowcount

    # Commit the transaction
    conn.commit()

    print("Data deleted successfully. Rows affected:", rows_deleted)
except (Exception, psycopg2.Error) as error:
    print("Error deleting data:", error)

# Close the cursor and the connection
cursor.close()
conn.close()

Make sure to replace the following placeholders with your own values:

• localhost: The hostname or IP address of your PostgreSQL server.
• your_database: The name of the PostgreSQL database.
• your_username: The username for accessing the database.
• your_password: The password for accessing the database.
• your_table: The name of the table from which you want to delete data.
• condition_column: The name of the column to use as a condition for deleting the data.
• 'ConditionValue': The value used in the condition to identify the specific rows to delete.

This code uses the psycopg2 library to establish a connection to the PostgreSQL database, create a cursor, execute an SQL DELETE statement with a placeholder, provide the value used in the condition, get the number of rows affected, commit the transaction, and handle any potential exceptions that may occur. The code also outputs the number of affected rows upon successful deletion. Make sure to install the psycopg2 library before running this code by executing pip install psycopg2 in your Python environment.