What is onUpgrade in SQLite?
Android SQLite onUpgrade() method In this class, the onUpgrade() method is responsible for upgrading the database when you make changes to the schema. It is called when the database file already exists, but its version is lower than the one specified in the current version of the app.
What is the purpose of SQLiteOpenHelper?
A helper class to manage database creation and version management. You create a subclass implementing onCreate , onUpgrade and optionally onOpen , and this class takes care of opening the database if it exists, creating it if it does not, and upgrading it as necessary.
Which of the following are the lifecycle methods of Android SQLiteOpenHelper?
The first time this is called, the database will be opened and onCreate(SQLiteDatabase) , onUpgrade(SQLiteDatabase, int, int) and/or onOpen(SQLiteDatabase) will be called….getWritableDatabase.
| Returns | |
|---|---|
| SQLiteDatabase | a read/write database object valid until close() is called |
What is getWritableDatabase?
getWritableDatabase() – Create and/or open a database that will be used for reading and writing. The first time this is called, the database will be opened and onCreate(SQLiteDatabase), onUpgrade(SQLiteDatabase, int, int) and/or onOpen(SQLiteDatabase) will be called.
What is SQLite helper class?
The android. database. sqlite. SQLiteOpenHelper class is used for database creation and version management. For performing any database operation, you have to provide the implementation of onCreate() and onUpgrade() methods of SQLiteOpenHelper class.
What is use of content provider in Android?
A content provider manages access to a central repository of data. A provider is part of an Android application, which often provides its own UI for working with the data. However, content providers are primarily intended to be used by other applications, which access the provider using a provider client object.
What is Android database SQLite SQLiteOpenHelper?
What is ContentValues?
ContentValues is a maplike class that matches a value to a String key. It contains multiple overloaded put methods that enforce type safety. Here is a list of the put methods supported by ContentValues: void put(String key, Byte value) void put(String key, Integer value)
What is onCreate method in Android Studio?
onCreate(Bundle savedInstanceState) Function in Android: After Orientation changed then onCreate(Bundle savedInstanceState) will call and recreate the activity and load all data from savedInstanceState. Basically Bundle class is used to stored the data of activity whenever above condition occur in app.
What database is used in Android?
SQLite
Most mobile developers are probably familiar with SQLite. It has been around since 2000, and it is arguably the most used relational database engine in the world. SQLite has a number of benefits we all acknowledge, one of which is its native support on Android.
How do I use getWritableDatabase?
getWritableDatabase(); call triggers the creation inside the creation. If you need to prefill the db, just use the db argument of onCreate as a writeable database. @Override public void onCreate(SQLiteDatabase db) { db.
What is Android SQLite?
SQLite is a opensource SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation. SQLite supports all the relational database features. In order to access this database, you don’t need to establish any kind of connections for it like JDBC,ODBC e.t.c.