Question

我有一个带有数据库和数据的应用程序，当我尝试将我的应用程序传递到另一部手机时数据消失了。什么建议或任何可以帮助的问题应该是什么问题？

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手机中。在其他设备上设置应用时，无法复制数据（如果您不以某种方式导出应用数据）。

应用程序数据库中的Sqlite数据库值消失了吗？

1 个答案: