@Override public void onUpgrade(SQLiteDatabase db, int oldversion, int newversion) { super.onUpgrade(db, oldversion, newversion); }
/** * Create and/or open a database that will be used for reading and writing. The first time this is * called, the database will be extracted and copied from the application's assets folder. * * <p>Once opened successfully, the database is cached, so you can call this method every time you * need to write to the database. (Make sure to call {@link #close} when you no longer need the * database.) Errors such as bad permissions or a full disk may cause this method to fail, but * future attempts may succeed if the problem is fixed. * * <p class="caution">Database upgrade may take a long time, you should not call this method from * the application main thread, including from {@link android.content.ContentProvider#onCreate * ContentProvider.onCreate()}. * * @throws SQLiteException if the database cannot be opened for writing * @return a read/write database object valid until {@link #close} is called */ @Override public synchronized SQLiteDatabase getWritableDatabase() { if (mDatabase != null && mDatabase.isOpen() && !mDatabase.isReadOnly()) { return mDatabase; // The database is already open for business } if (mIsInitializing) { throw new IllegalStateException("getWritableDatabase called recursively"); } // If we have a read-only database open, someone could be using it // (though they shouldn't), which would cause a lock to be held on // the file, and our attempts to open the database read-write would // fail waiting for the file lock. To prevent that, we acquire the // lock on the read-only database, which shuts out other users. boolean success = false; SQLiteDatabase db = null; // if (mDatabase != null) mDatabase.lock(); try { mIsInitializing = true; // if (mName == null) { // db = SQLiteDatabase.create(null); // } else { // db = mContext.openOrCreateDatabase(mName, 0, mFactory); // } db = createOrOpenDatabase(false); int version = db.getVersion(); // do force upgrade if (version != 0 && version < mForcedUpgradeVersion) { db = createOrOpenDatabase(true); db.setVersion(mNewVersion); version = db.getVersion(); } if (version != mNewVersion) { db.beginTransaction(); try { if (version == 0) { onCreate(db); } else { if (version > mNewVersion) { Log.w( TAG, "Can't downgrade read-only database from version " + version + " to " + mNewVersion + ": " + db.getPath()); } onUpgrade(db, version, mNewVersion); } db.setVersion(mNewVersion); db.setTransactionSuccessful(); } finally { db.endTransaction(); } } onOpen(db); success = true; return db; } finally { mIsInitializing = false; if (success) { if (mDatabase != null) { try { mDatabase.close(); } catch (Exception e) { } // mDatabase.unlock(); } mDatabase = db; } else { // if (mDatabase != null) mDatabase.unlock(); if (db != null) db.close(); } } }