是以下查詢有效的MySQL: SELECT * FROM table WHERE field & number = number;
# to find values with superset of number's bits
SELECT * FROM table WHERE field | number = number;
# to find values with subset of
我在Java程序中使用一些長的值作爲位圖。這裏是我的方法至今: public class BitmapUtil
{
private static final long _B_MASK_LEFT_ON = 0x8000000000000000L;
public static long setNthMsb(int n)
{
return BitmapUti