应用程序数据库中的 SqlLite 数据库值消失了

Question

我有一个包含数据库和数据的应用程序，当我尝试将我的应用程序传递给另一部手机时，数据不见了。有什么建议或可以帮助的问题是什么？

这是我创建数据库的代码

public class DbDialect {
public static final String KEY_ROWID = "_id";
public static final String KEY_TAGALOG = "tagalog";
public static final String KEY_BICOLANO = "bicolano";
public static final String KEY_ILOCANO = "ilocano";
private static final String DATABASE_NAME = "Dialectsdb";
private static final String DATABASE_TABLE = "dialectsTable";
private static final int DATABASE_VERSION = 3;
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;

private static class DbHelper extends SQLiteOpenHelper{
    public DbHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        // TODO Auto-generated constructor stub
    }
    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
                KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                KEY_TAGALOG + " TEXT NOT NULL, " + KEY_BICOLANO +
                " TEXT NOT NULL, " + KEY_ILOCANO +" TEXT NOT NULL );"   
        );
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS " + DATABASE_NAME + "");
        onCreate(db);
    }
}
public DbDialect(Context c){
    ourContext = c;
}

public DbDialect open() throws SQLException{
    ourHelper = new DbHelper(ourContext);
    ourDatabase = ourHelper.getWritableDatabase();
    return this;
}
public void close(){
    ourHelper.close();
}
public long createEntry(String tagalog, String bicolano, String ilocano) {
    // TODO Auto-generated method stub
    ContentValues cv = new ContentValues();
    cv.put(KEY_TAGALOG, name);
    cv.put(KEY_BICOLANO, hotness);
    cv.put(KEY_ILOCANO, surname);
    return ourDatabase.insert(DATABASE_TABLE, null, cv);

}
public String getData() {
    // TODO Auto-generated method stub
    String[] columns = new String[]{ KEY_ROWID, KEY_TAGALOG, KEY_BICOLANO, KEY_ILOCANO};
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
    String result = "";
    int iRow = c.getColumnIndex(KEY_ROWID);
    int iTagalog = c.getColumnIndex(KEY_TAGALOG);
    int iBicolano= c.getColumnIndex(KEY_BICOLANO);
    int iIlocano= c.getColumnIndex(KEY_ILOCANO);
    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
        result = result + c.getString(iRow) + " " + c.getString(iName) + " " + c.getString(iHotness) + " " + c.getString(iSurname) + "n";
    }
    return result;
}

public String getTagalog(String s) {
    // TODO Auto-generated method stub
    Cursor c = ourDatabase.rawQuery("SELECT * FROM " + DATABASE_TABLE + " WHERE " + KEY_TAGALOG + " LIKE '" + s + "' OR " + 
    KEY_BICOLANO + " LIKE '" + s + "' OR " + KEY_ILOCANO + " LIKE '" + s + "'", null);
    //SELECT * FROM a WHERE tagalog LIKE "Wala" OR bicolano LIKE "Dai" OR ilocano LIKE "Wara"
    if (c != null){
        c.moveToFirst();
        String Tag = c.getString(1);
        return Tag;
    }
    return null;
}

public String getBicol(String s) {
    // TODO Auto-generated method stub
    Cursor c = ourDatabase.rawQuery("SELECT * FROM " + DATABASE_TABLE + " WHERE " + KEY_TAGALOG + " LIKE '" + s + "' OR " + 
            KEY_BICOLANO + " LIKE '" + s + "' OR " + KEY_ILOCANO + " LIKE '" + s + "'", null);
    if (c != null){
        c.moveToFirst();
        String Bic = c.getString(2);
        return Bic;
    }
    return null;
}

public String getIlocano(String s) {
    // TODO Auto-generated method stub
    Cursor c = ourDatabase.rawQuery("SELECT * FROM " + DATABASE_TABLE + " WHERE " + KEY_TAGALOG + " LIKE '" + s + "' OR " + 
            KEY_BICOLANO + " LIKE '" + s + "' OR " + KEY_ILOCANO + " LIKE '" + s + "'", null);
    if (c != null){
        c.moveToFirst();
        String Bic = c.getString(3);
        return Bic;
    }
    return null;
}

}

Answer 1

您的数据库仅存储在您的手机中。当您在其他设备上设置应用时，无法复制数据（如果您没有以某种方式导出应用数据）。