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からデータを取得... 私はassets
アンドロイド:洋外部SQLiteデータベース
に私の外部データベースからデータを取得しようとしているが、私はアプリを実行したとき、それは:-(/data/data/packagename/databases/
で別のデータベースを作成したように、思われましたないassets
から外部データベースは私が挿入され、エラー(残念ながら、のAppが停止している)を引き起こすここに私のコードです:。
ingameinterfaceの.java *
public class ingameinterface extends Activity {
DBHelper dbhelper;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ingameinterface);
String[] from = new String[] { "CtrlNo", "Prima", "Key_Word", "Val" };
int[] to = new int[] { R.id.itmCc1, R.id.itmCc2, R.id.itemCc3, R.id.itemCc4};
dbhelper = new DBHelper(this);
try {
dbhelper.createDataBase();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Cursor c = dbhelper.getData();
if (c.getCount() == 0) {
showmessage("Error!", "Nothing found.");
return;
}
StringBuffer buff = new StringBuffer();
while (c.moveToNext()) {
buff.append("Controlnum: " + c.getString(0) + "\n");
buff.append("Prima: " + c.getString(1) + "\n");
buff.append("Word: " + c.getString(2) + "\n");
buff.append("Value: " + c.getString(3) + "\n\n");
}
showmessage("Data", buff.toString());
}
public void showmessage(String title, String Message){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setCancelable(true);
builder.setTitle(title);
builder.setMessage(Message);
}
}
と DBHelper.Java *
public class DBHelper extends SQLiteOpenHelper {
private static String DB_NAME = "db_vocabulary";
private SQLiteDatabase db;
private final Context context;
private String DB_PATH;
public DBHelper(Context context) {
super(context, DB_NAME, null, 1);
this.context = context;
DB_PATH = "/data/data/" + context.getPackageName() + "/" + "databases/";
}
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
// throw new Error("Error copying database");
}
}
}
private boolean checkDataBase() {
File dbFile = new File(DB_PATH + DB_NAME);
return dbFile.exists();
}
private void copyDataBase() throws IOException {
InputStream myInput = context.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
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 Cursor getData() {
String myPath = DB_PATH + DB_NAME;
db = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);
Cursor c = db.rawQuery("SELECT * FROM TblWords WHERE Prima = 1", null);
return c;
}
@Override
public void onCreate(SQLiteDatabase arg0) {
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
}
しかし、私の外部データベースはすでに内部のデータを持っていました。X-( – user5425674
INSERT INTO X.TABLE(fieldname1、fieldname2)SELECT fieldname1、fieldname2 FROM Y.TABLE; –