小编Dyl*_*lan的帖子

我已经开始学习MySQL了.

这是表格world:

+-------------+-----------+---------+
|    name     | continent |  area   |
+-------------+-----------+---------+
| Afghanistan | Asia      | 652230  |
| Albania     | Europe    | 2831741 |
| Algeria     | Africa    | 28748   |
| ...         | ...       | ...     |
+-------------+-----------+---------+

我需要:

列出每个大洲以及按字母顺序排列的国家/地区名称

SELECT的结果必须是:

+---------------+---------------------+
|   continent   |         name        |
+---------------+---------------------+
| Africa        | Algeria             |
| Asia          | Afghanistan         |
| Caribbean     | Antigua and Barbuda |
| Eurasia       | Armenia             |
| Europe        | Albania             |
| …

我想了解,ProtoBuf.js工作怎么样？

ProtoBuf - https://github.com/dcodeIO/ProtoBuf.js

我的proto文件gameSetting.proto看起来像:

message GameSettings {
    required string gameName = 1;
    repeated Category categories = 2;
}

message Category {
    required int32 categoryId = 1;
    required string categoryAbbreviation = 2;
    required string categoryName = 3;
    required string numberInSquad = 4;
    required string numberInTeam = 5;
    required string captain = 6;
}

在这里,我正在实现具有解码和数据编码的JavaScript代码:

  var ProtoBuf = dcodeIO.ProtoBuf;
  var protoURL = '../_doc/protobuf/gameSettings.proto';
  var dataURL = '../xmlapi?type=game-settings&competitionid=1&outputtype=text';
  var builder = ProtoBuf.loadProtoFile( protoURL, function(err, builder) {

// WE …

要调整缓冲图像的大小,我有以下方法:

    BufferedImage resizeImage(BufferedImage img, int newW, int newH) {
    Image tmp = img.getScaledInstance(newW, newH, Image.SCALE_SMOOTH);
    BufferedImage dimg = new BufferedImage(newW, newH, BufferedImage.TRANSLUCENT);
    Graphics2D g2d = dimg.createGraphics();
    g2d.drawImage(tmp, 0, 0, null);
    g2d.dispose();

    return dimg;
}

是否有更好的方法来调整图像大小而不会降低质量？

我正在使用谷歌样本创建Android相机应用程序.手机拍摄图像后,图像质量会有所不同.相机预览比输出图像具有更好的图像质量.如何提高输出图像的质量？在缩放变焦之后,预览图像和输出图像的质量差异甚至增加.这是我的照片片段,它是基类.

I use google sample to create Android camera app. During several days I cannot resolve the issue with the output image quality.This is a base Fragment for capture photo/video.

public class Camera2BaseFragment extends Fragment implements View.OnTouchListener {

   protected static final SparseIntArray DEFAULT_ORIENTATIONS = new SparseIntArray();

   protected final String FRAGMENT_DIALOG = "dialog";
   protected Integer[] mExposureCompensation = {};
   protected String mCameraId = "0";
   protected float mFingerSpacing = 0f;
   protected double mZoomLevel = 1;
   protected int mCurrentProgress = 0;
   protected int mSensorOrientation;
   protected …

我已经从旧式的事务管理迁移TransactionProxyFactoryBean到Spring推荐的声明式事务管理,以避免出现不时出现的事务的异常.

对于交易save update delete我添加了注释:

@Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)

它对我有用.

问题是:

@Transactional当事务只读取数据时,我应该避免使用注释吗？

例:

public TradeData getTrade(long tradeId) throws Exception {
   return em.find(TradeData.class, tradeId);
}

看完这篇文章后说:

"更好的是,@Transactional在执行读取操作时完全避免使用注释,如清单10所示:"

我有点困惑,我不太明白.

使用BufferedImage bgImage我想为图像上的文本设置黑色。

BufferedImage bgImage = createBgImageForText();
bgImage.createGraphics().drawString(player.getPlayerName(), 25, 15);
if ("Y".equalsIgnoreCase(player.getCaptain())) {
    bgImage.createGraphics().setPaint(Color.BLACK);
} else {
    bgImage.createGraphics().setPaint(Color.WHITE);
}

mainImg.getGraphics().drawImage(bgImage, 10, 10, null);

但默认情况下，文本始终为白色。如何改变文字的颜色？