![]() ![]() The example that I have used here contains DBHelper class that extends SQLiteOpenHelper class and perform all database related operations.įor creating the database we will call constructor of SQLiteOpenHelper class using super(). The SQLiteDatabase class provides various methods to perform create, read, update and delete operations.īefore working with SQLite database we have to first extend SQLiteOpenHelper class.The SQLiteOpenHelper class provides all the functionality for sqlite database.The package contains sqlite specific classes.Table Name: record Field Type id integer, primary key, autoincrement name text The database table that I will use in this tutorial has following structure. Android already comes with built in sqlite database. SQLite is light weight open source database that stores data in text files. Here are some typicalstatements that create and delete a table: Just like files that you save on the devices internalstorage, Android stores your database in your apps private folder. Here we will see how to use sqlite database as a storage system in android to perform CRUD operations. Once you have defined how your database looks, you should implement methodsthat create and maintain the database and tables. There are several storage options available in android like shared preferences, internal and external storage, sqlite, etc. Import article is about android sqlite database tutorial. Import 7.app.AlertDialogĬlass MainActivity : AppCompatActivity() "Ĭreate a layout for display AlertDialog for update record. The val databaseHandler: DatabaseHandler= DatabaseHandler(this) creates the instance of DatabaseHandler class calls the SQLite database logic. The viewRecord() function reads the record and displays them into ListView, the updateRecord() function updates the record on the basis on id, and deleteRecord() function deletes the record. In this class, the saveRecord() function saves the records. In this file, we added three EditText, one ListView, four Button for saving, view, update and delete operation.Īdd the following code in the MainActivity.kt class. In the activity_main.xml file add the following code. In this example, we will perform create, read, update and delete operation on Android SQLite database. Kotlin Android SQLite Database CRUD Example Query(String table, String columns, String selection, String selectionArgs, String groupBy, String having, String orderBy): Cursor Update(String table, ContentValues values, String whereClause, String whereArgs): Int SQLite is a relational database, open source, it is built on the Android operating system, so you can use it any time, and without any further configuration. The third argument specifies the values to be stored. If the second argument is null, android will store null values if values are empty. The table specifies the table name, nullColumnHack doesn't allow completely null values. Insert(String table, String nullColumnHack, ContentValues values): Long Some of them are as follows: MethodĮxecutes the SQL query, not a select query. There are many methods in the SQLiteDatabase class. Chúng ta s dng hàm delete ca SQLiteDatabase xóa d liu ca mt hoc mt s record trong bng theo mt iu kin bt k nào ó. It contains methods to be performed on the SQLite database such as create, update, delete, select etc. Public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion)Ĭalled when the database needs to downgrade. ![]() Public abstract void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)Ĭalled when the database needs to upgrade. ![]() Public abstract void onCreate(SQLiteDatabase db)Ĭalled only once when the database is created for the first time. There are several methods available in the SQLiteOpenHelper class. SQLiteOpenHelper(context: Context, name: String, factory: SQLiteDatabase.CursorFactory, version: Int, errorHandler: DatabaseErrorHandler)Ĭreates an object of SQLiteOpenHelper for creating, opening and managing the database. SQLiteOpenHelper(context: Context, name: String, factory: SQLiteDatabase.CursorFactory, version: Int)Ĭreates an object of SQLiteOpenHelper for creating, opening and managing the database. There are two constructors of SQLiteOpenHelper class. For performing any database operation, you have to provide the implementation of onCreate() and onUpgrade() methods of SQLiteOpenHelper class. The class is used for database creation and version management. The SQLiteOpenHelper class provides the functionality to use the SQLite database. So, there is no need to perform any database setup or administration task. SQLite is an open-source relational database that is used to perform database operations on Android devices such as storing, manipulating or retrieving persistent data from the database.īy default SQLite database is embedded in android. Next → ← prev Kotlin Android SQLite Tutorial
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