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 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. 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. The following class is the test for upgrading your SQLite database.Next → ← prev Kotlin Android SQLite Tutorial If there is any issue with the upgrade, typically a SQLException will be thrown and the test will fail. The test is simple: Instead of uninstalling one version of the app and installing the new one on top of it, it copies a version of the database from the /androidTest/assets/ folder and then performs an upgrade on that version to the latest version of your application. I decided to try add at least a basic test to the Github Project that demos Android Database Upgrades . How to test SQLite Database Upgrades automatically: Testing 30+ different versions of your application is a tedious process and you are most likely to miss something in one of the tests. (In my case its something like 30 versions of the database □) This process would need to be repeated for every database version that you have released. Test that nothing is broken and that the database upgrades as expected.
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