![]() This class also encapsulates the logic for Create, Read, Update, and Delete (CRUD) operations. ![]() It aids managing the creation and versioning of your SQLite database. DatabaseHelper ClassĪ 'DatabaseHelper' class in Android development extends the SQLiteOpenHelper class. Learn more about CRUD operations at Wikipedia. Performing CRUD operations efficiently is crucial for maintaining the performance, consistency, and integrity of your application's data. These operations are essential for any application that involves data storage and retrieval. If you need assistance with your Android app development or are looking to hire Android developers, visit Reintech for more information.ĬRUD (Create, Read, Update, and Delete) operations are the fundamental functions required for managing and manipulating data in a database. This should serve as a solid foundation for further development. We created a helper class for managing database creation, versioning, and CRUD operations, and integrated it into our main activity. In this tutorial, we have learned how to develop a database-driven Android app using SQLite. For example, insert a new record:ĭatabaseHelper dbHelper = new DatabaseHelper(this) In your main activity, create an instance of the "DatabaseHelper" class and use it to perform CRUD operations. Step 4: Integrating the Database Helper Class in the Activity Public class DatabaseHelper extends SQLiteOpenHelper ) This class will help manage the database creation, version management, and CRUD operations. Step 2: Creating the Database Helper ClassĬreate a new class called "DatabaseHelper" that extends the SQLiteOpenHelper class. Implementation 'nstraintlayout:constraintlayout:2.0.4'ĪndroidTestImplementation ':junit:1.1.2'ĪndroidTestImplementation ':espresso-core:3.3.0'Ĭlick "Sync Now" to update your project with the added dependencies. Implementation 'androidx.appcompat:appcompat:1.2.0' Once your project is set up, open the adle file (Module: app) and add the following dependencies: Give your project a name and set the package name, then click "Finish". Choose the "Empty Activity" template and click "Next". Step 1: Setting Up the Android Studio Projectįirst, create a new Android Studio project by selecting File > New > New Project. This tutorial assumes you have a basic understanding of Android app development and Java programming. SQLite is a lightweight and serverless database engine that allows you to create local databases for your Android applications. Package import import import import import import import this tutorial, we will learn how to develop a database-driven Android app using SQLite. The data stored can be checked on the logcat. In the below example, we are demonstrating the usage of the android SQLite database to store and fetch the data. Int update(String table, ContentValues values, String whereClause, String whereArgs)Ĭursor query(String table, String columns, String selection, String selectionArgs, String groupBy, String having, String orderBy) The values to be stored are specified by the third argument. The null values are stored by android, if the second argument is null and the values are empty. Completely null values are not allowed by the nullColumnHack. The table name is specified by the table. Long insert(String table, String nullColumnHack, ContentValues values) To execute the sql query not select query. Some of the important methods of the SQLiteDatabase class are: Method The SQLiteDatabase class has many methods. The methods like create, update, delete, select, etc, that are performed on the SQLite database are included in the SQLiteDatabase class. To be called when the database needs to be downgraded. Public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) To be called when the database needs to be upgraded. ![]() ![]() Public abstract void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) To be called when the database is created for the first time. Public abstract void onCreate(SQLiteDatabase db) Some of the important methods of the SQLiteOpenHelper class are: Method The SQLiteOpenHelper class has many methods. To create an object that can create, open and manage the database, and to also specify the error handler. SQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version, DatabaseErrorHandler errorHandler) To create an object that can create, open and manage the database. SQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) The SQLiteOpenHelper class has two constructors. The implementation of onCreate() and onUpgrade() methods of SQLiteOpenHelper class is required to be provided to perform any database operation. The functionality to use the SQLite database is provided by the class which is used for database creation and version management. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |