How is the integrity of operations implemented and guaranteed within a transaction?

The integrity of operations within a transaction is ensured by the ACID principle (Atomicity, Consistency, Isolation, Durability). In Android, for example, when working with the SQLite database, transactions are implemented through the methods beginTransaction(), setTransactionSuccessful(), and endTransaction().

Example:

SQLiteDatabase db = dbHelper.getWritableDatabase();
db.beginTransaction();
try {
    // Perform multiple operations, such as insert or update
    db.insert(...);
    db.update(...);
    db.setTransactionSuccessful(); // mark the transaction as successful
} finally {
    db.endTransaction(); // if setTransactionSuccessful is not called, changes are rolled back
}

If an error occurs during the transaction, all changes are rolled back, ensuring data integrity and preventing partial updates.