Question

我在$ new面前尝试过sort（），但它不会工作，我应该把它放在哪里？

$new = mysql_query("SHOW COLUMNS FROM Professors");

   while($row = mysql_fetch_array($new)) {  

    $output .= "{$row['Field']}";
    echo $output;
}

我也尝试过这样的事情：

  $new = "SELECT column_name FROM INFORMATION_SCHEMA.COLUMNS WHERE   table_name = 'Professors' ORDER BY column_name";

但是，在我的SQL编译器上，它会对它们进行正确排序，它们不会在页面上打印出上面的确切代码。

Answer 1

试试这个，然后：

public class PlayGifView extends View {

private static final int DEFAULT_MOVIEW_DURATION = 1000;

private int mMovieResourceId;
private Movie mMovie;

private long mMovieStart = 0;
private int mCurrentAnimationTime = 0;

@SuppressLint("NewApi")
public PlayGifView(Context context, AttributeSet attrs) {
    super(context, attrs);

    /**
     * Starting from HONEYCOMB have to turn off HardWare acceleration to draw
     * Movie on Canvas.
     */
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        setLayerType(View.LAYER_TYPE_SOFTWARE, null);
    }
}

public void setImageResource(int mvId){
    this.mMovieResourceId = mvId;
    mMovie = Movie.decodeStream(getResources().openRawResource(mMovieResourceId));
    requestLayout();
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    if(mMovie != null){
        setMeasuredDimension(mMovie.width(), mMovie.height());
    }else{
        setMeasuredDimension(getSuggestedMinimumWidth(), getSuggestedMinimumHeight());
    }
}

@Override
protected void onDraw(Canvas canvas) {
    if (mMovie != null){
        updateAnimtionTime();
        drawGif(canvas);
        invalidate();
    }else{
        drawGif(canvas);    //NULLPTR EXCEPTION
    }
}

private void updateAnimtionTime() {
    long now = android.os.SystemClock.uptimeMillis();

    if (mMovieStart == 0) {
        mMovieStart = now;
    }
    int dur = mMovie.duration();
    if (dur == 0) {
        dur = DEFAULT_MOVIEW_DURATION;
    }
    mCurrentAnimationTime = (int) ((now - mMovieStart) % dur);
}

private void drawGif(Canvas canvas) {
    mMovie.setTime(mCurrentAnimationTime);  //NULLPTR EXCEPTION
    mMovie.draw(canvas, 0, 0);
    canvas.restore();
}

}

您正确地订购并按列名选择，但您没有获得正确的字段名称。

如何按字母顺序对此SQL查询进行排序？

1 个答案: