I am working on an android application where i used existing sqlite database in the asset folder. So i actually copy the database from that folder. User can also save their own data(mark any content as favorite).
I uploaded a version in the market. Now i want to add some new data in the database and uploaded a new version. If user update the app from the market i want to keep the user data(from previous version) and add the new data as well. I have done some google and found that on upgrade method should do the trick. But I am changing the DATABASE_VERSION from code but the on upgrade method does not get call. I am wondering i have missed something. Here is my code:
public class DataBaseHelper extends SQLiteOpenHelper {
private static String DB_PATH = "/data/data/riskycoder.login/databases/";
public static String DB_NAME = "datenbank_EN.sqlite";
private SQLiteDatabase myDataBase;
private final Context myContext;
private static final int DATABASE_VERSION = 1;
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, DATABASE_VERSION);
this.myContext = context;
}
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getWritableDatabase();
try {
this.close();
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null,SQLiteDatabase.OPEN_READWRITE);
} catch (SQLiteException e) {
}
if (checkDB != null)
checkDB.close();
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException {
InputStream myInput = myContext.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[2048];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
//myDataBase.setVersion(DATABASE_VERSION);
}
public void openDataBase() throws SQLException {
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null,SQLiteDatabase.OPEN_READWRITE);
Log.d("Test", "Database version: " +myDataBase.getVersion());
}
@Override
public synchronized void close() {
if (myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.d("Test", "in onUpgrade. Old is: " + oldVersion + " New is: " + newVersion);
}
}
onUpgrade()
is only called if a change in the database version number is detected. Increment the database version as follows:
private static final int DATABASE_VERSION = 2;