퀴즈 게임이 있는데 데이터베이스에 높은 점수와 다른 테이블의 질문을 유지하면서 다음 db 어댑터를 사용합니다. 더 많은 질문으로 데이터베이스를 업데이트하면 데이터베이스를 덮어 쓰게되므로 높은 점수로 처리됩니다. 플레이어가 점수를 잃어 버리지 않고 질문 표만 업데이트 할 수 있도록 어떻게 높은 점수를 유지할 수 있습니까?업그레이드하는 동안 데이터베이스에서 테이블을 유지하십시오.
public class AnyDBAdapter {
private static final String TAG = "AnyDBAdapter";
private DatabaseHelper mDbHelper;
private static SQLiteDatabase mDb;
private static String DB_PATH = "/data/data/xx.xxxxx.xxxx/databases/";
private static final String DATABASE_NAME = "dbname";
private static final int DATABASE_VERSION = 1;
private final Context adapterContext;
public AnyDBAdapter(Context context) {
this.adapterContext = context;
}
public AnyDBAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(adapterContext);
try {
mDbHelper.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
mDbHelper.openDataBase();
} catch (SQLException sqle) {
throw sqle;
}
return this;
}
public void close() {
mDbHelper.close();
}
private static class DatabaseHelper extends SQLiteOpenHelper {
Context helperContext;
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
helperContext = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database!!!!!");
//db.execSQL("");
onCreate(db);
}
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
SQLiteDatabase db_Read = null;
if (dbExist) {
} else {
db_Read = this.getReadableDatabase();
db_Read.close();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
public SQLiteDatabase getDatabase() {
String myPath = DB_PATH + DATABASE_NAME;
return SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);
}
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH + DATABASE_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException {
// Open your local db as the input stream
InputStream myInput = helperContext.getAssets().open(DATABASE_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DATABASE_NAME;
// Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
// transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException {
// Open the database
String myPath = DB_PATH + DATABASE_NAME;
mDb = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
}
@Override
public synchronized void close() {
if (mDb != null)
mDb.close();
super.close();
}
}}
onUpgrade – njzk2