Day 27: Performing CRUD Operations in Python with Databases

In our last post, we connected Python to databases like SQLite, MySQL, and PostgreSQL.
Today, let’s dive into the most important database actions — CRUD:

• Create → Insert new data

• Read → Retrieve data

• Update → Modify existing records

• Delete → Remove records

Let’s see how these operations look in real Python code. 

                                  

🔹 Steps to Perform CRUD Operations

1. Connect to Database

   • Import the respective library (sqlite3, mysql.connector, or psycopg2).

   • Establish a connection to the database.

   • Create a cursor object.

2. CREATE (Insert Data)

   • Create a table if it does not exist.

   • Insert records using INSERT INTO statements.

   • Commit the changes.

3. READ (Fetch Data)

   • Use SELECT * FROM table_name.

   • Fetch and display results with fetchall().

4. UPDATE (Modify Data)

   • Update records using UPDATE table_name SET column = value WHERE condition.

   • Commit the changes.

5. DELETE (Remove Data)

   • Delete records using DELETE FROM table_name WHERE condition.

   • Commit the changes.

6. Close Connection

   • Always close the connection after operations using .close().

1. SQLite Example

                                            

2. CRUD with MySQL

                                            

3. CRUD with PostgreSQL

                            

✅ Key Points

• Use commit() after insert, update, and delete.

• Always close the connection when done.

• For security, use placeholders instead of inserting raw values directly.

📌 Conclusion

CRUD operations are the building blocks of any database-powered application.
From now on, you can create, read, update, and delete records in SQLite, MySQL, or PostgreSQL directly from Python.

Keep This in Mind:

                              💡 "Databases are the backbone of every application — master them, and you master the flow of information."