Update Operations

Update Operations

Update operations in SQLite involve modifying existing data in a database table. These operations are used to make changes to existing records based on specific criteria. Here's how you can perform update operations in SQLite.

Basic Update Operation

The primary SQL statement for updating data is the UPDATE statement. Here's a basic example:

In this example, we:

• Connect to the database;
• Create a cursor to execute SQL queries;
• Use an UPDATE query to modify the "title" of a specific record in the "articles" table, identified by its "id";
• Execute the query with cursor.execute(update_query);
• Save the changes to the database using connection.commit();
• Finally, close the database connection.

Updating Multiple Records

To update multiple records that match certain criteria, you can use a WHERE clause in the UPDATE query:

This query will update the "title" for all records where the author matches 'John Doe'.

Updating Multiple Columns

You can also update multiple columns simultaneously by specifying multiple column assignments in the SET clause:

This query will update both the "title" and "content" for the record with "id" equal to 1.

Updating with Variables

You can use variables in your UPDATE queries to update data dynamically. Here's an example of how to do that:

This query will update the "title" of the record with "id" equal to the value stored in the record_id variable.

These are the basic concepts for performing update operations in SQLite using Python. You can customize your UPDATE queries to modify specific data in your database as needed.