How does SQLite in Android work internally in Android SDK?

SQLite is a lightweight, serverless SQL database engine that is commonly used in Android applications. It is integrated into the Android SDK to provide a robust way to store and manage application data. SQLite operates directly on the application’s file system, making it easy to use without the need for a separate server process.

Internally, SQLite works by providing a lightweight database engine that supports transactions, SQL query execution, and multiple concurrent read and write operations. When you perform operations in an SQLite database, the engine handles the low-level file I/O and ensures data integrity through ACID (Atomicity, Consistency, Isolation, Durability) compliance.

Android offers the SQLiteOpenHelper class, which simplifies the database creation and version management tasks. You can extend this class to manage your database schema and provide easy access to your data.

Basic Example of Using SQLite in Android

public class MyDatabaseHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "my_database.db";
    private static final int DATABASE_VERSION = 1;

    public MyDatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String createTable = "CREATE TABLE users (id INTEGER PRIMARY KEY, name TEXT, age INTEGER)";
        db.execSQL(createTable);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS users");
        onCreate(db);
    }
}