无法将数据设置到数据库中

Question

在下面的代码中，我尝试从数据库中获取和设置数据但在执行期间我无法在数据库中设置数据......

SettingUp

mWirelessRouters = WalletWirelessRouter.get(getActivity()).getWirelessRouter(uuid);

onTextChanged Listner

 mBaseStationName = (EditText) v.findViewById(R.id.base_station_name);
    mBaseStationName.setText(mWirelessRouters.getBaseStationName());
    mBaseStationName.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged
                (CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged
                (CharSequence s, int start, int before, int count) {
           mWirelessRouters.setBaseStationName(s.toString());
        }

        @Override
        public void afterTextChanged
                (Editable s) {

        }
    });

注意： - 在上面的代码中我尝试从用户那里获取基站名称并在数据库中更新它。没有问题相关的视图

getWirelessRouter（UUID uuid）

 public WirelessRouter getWirelessRouter(UUID id)
{
    WalletCursorWrapper cursor = queryWireless(
            WalletDbSchema.WirelessRouter.Cols.UUID + " =? "
            , new String[]
                    {
                            id.toString()
                    }
    );

    try {
        if (cursor.getCount() == 0) {
            return null;
        }

        cursor.moveToFirst();
        return cursor.getWirelessRouter();
    } finally {
        cursor.close();
    }
}

queryWireless

 private WalletCursorWrapper queryWireless (String whereClause, String[] whereArgs)
{
    Cursor cursor = mDatabase.query(
            WalletDbSchema.WirelessRouter.NAME,
            null, // Colums - null select all colums
            whereClause,
            whereArgs,
            null, //groupBy
            null, //having
            null // order

    );

    return new WalletCursorWrapper(cursor);
}

setBaseStation

 public void setBaseStationName(String baseStationName) {
    mBaseStationName = baseStationName;
}

插入（）

public void addWireless (WirelessRouter w)
{
    ContentValues values = getContentValues(w);

    mDatabase.insert(WalletDbSchema.WirelessRouter.NAME, null, values);
}

启动新片段

 @Override
public boolean onOptionsItemSelected(MenuItem item)
{
    switch (item.getItemId())
    {
        case R.id.menu_item_new:
             WirelessRouter wirelessRouter = new WirelessRouter();
            WalletWirelessRouter.get(getActivity()).addWireless(wirelessRouter);
            Intent intent = WirelessRouterPagerActivity
                    .newIntent(getActivity(), wirelessRouter.getUUID());
            startActivity(intent);
            return true;


        default:
            return super.onOptionsItemSelected(item);
    }

}

注意： - 我在创建片段时将空字符串数据插入数据库

更新数据库

 public void upDateWireless(WirelessRouter wirelessRouter)
{
    String uuidString = wirelessRouter.getUUID().toString();
    ContentValues values = getContentValues(wirelessRouter);

    mDatabase.update(WalletDbSchema.WirelessRouter.NAME, values,
            WalletDbSchema.WirelessRouter.Cols.UUID + " =?"
            , new String[]{uuidString});
}

可写数据库

 public WalletWirelessRouter (Context context)
{
    mContext = context.getApplicationContext();
    mDatabase = new WalletBaseHelper(mContext)
            .getWritableDatabase();
}

如果您需要更多数据，请告诉我们

Answer 1

如果您希望在完成时保存值，则需要处于事务（并且COMMIT）。

SQLiteDatabase db = this.getWritableDatabase();
db.beginTransaction()

...插入，更新，删除等

if (ok) {
   db.setTransactionSucessful();
}
db.endTransaction();
db.close();

此总是对我有用。