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. SQLiteDatabase.The functionality to use the SQLite database is provided by the class which is used for database creation and version management. The code of this constructor looks like this: public MyDBHandler(Context context, Stringname, The database can be initialized in the constructor of the MyDBHandler class. We must also use import statements, as follows: import Type Student in the Name item, maintain the default options, and click the OK button:Īdding the following lines of code for the Student class: public class Student Right-click the myfirstdatabase package and selecting New > Java Class. The Student class contains fields, constructors, and properties as follows: My application model can be shown in the following figure: A third class (Student class) will need to be implemented to hold the database entry data as it is passed between the activity and the handler. The database handler will be a subclass of SQLiteOpenHelper and will provide an abstract layer between the underlying SQLite database and the activity class. The application will consist of an activity and a database handler class (MyDBHandler class). We will create a database Android application that has a UI as follows:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |