sqliteopenhelper

Backup Room database

by

This doesn’t answer the original question How can I properly re-open room db after I close it? However, if moving everything to the original database file is what you want to do, then you don’t have to close the database in the first place. You can instead force a checkpoint using the wal_checkpoint pragma. Query … Read more

SQLite Connection leaked although everything closed

by

The bolded font in the citation corresponds to this part in your code: private DatabaseManager open() throws SQLException { dbHelper = new DatabaseHelper(context); db = dbHelper.getWritableDatabase(); from: http://www.androiddesignpatterns.com/2012/05/correctly-managing-your-sqlite-database.html Approach #1: Use an Abstract Factory to Instantiate the SQLiteOpenHelper Declare your database helper as a static instance variable and use the Abstract Factory pattern to guarantee … Read more

Android SQLite Example [closed]

by

Sqlite helper class helps us to manage database creation and version management. SQLiteOpenHelper takes care of all database management activities. To use it, 1.Override onCreate(), onUpgrade() methods of SQLiteOpenHelper. Optionally override onOpen() method. 2.Use this subclass to create either a readable or writable database and use the SQLiteDatabase’s four API methods insert(), execSQL(), update(), delete() … Read more

When does SQLiteOpenHelper onCreate() / onUpgrade() run?

by

SQLiteOpenHelper onCreate() and onUpgrade() callbacks are invoked when the database is actually opened, for example by a call to getWritableDatabase(). The database is not opened when the database helper object itself is created. SQLiteOpenHelper versions the database files. The version number is the int argument passed to the constructor. In the database file, the version … Read more