select GUID,车次编码,车次类型，座位类型，车厢号码，座位编码，座位位置,车票版本号 from 订票表where  to_number(substring(座位标识,3,15))=0 and 发车日期='2016-06-11' and 车次编码='G71' and substring(始发受限车站,3,4)=1 and substring(终到受限车站,15,16)=1 and 车票状态='待售' and 车次类型='二等座' and 座位位置='F'and 受限渠道=2|受限渠道order by 余票数量 asc ,车厢 asc --先卖余票少的，防止打乱更多的长途票

update 订票表 set 座位标识=座位标识 | 000111111111111000,车票版本号=车票版本号+1,余票数量 = 余票数量-（15-3）where GUID = Md5(车次+座位编码+发车日期) and 车票版本号=取得的版本号 --乐观锁  根据更新结果是否为1则可以判定购票成功

update 订票表 set 座位标识=座位标识 ^ 000111111111111000,余票数量 = 余票数量+（15-3）,车票版本号=车票版本号+1where GUID = Md5(车次+座位编码+发车日期)  and 车票版本号=取得的版本号 --乐观锁 根据返回结果为1则标识退票成功

  1 import java.math.BigDecimal;
  2
  3 public class MainTest {  4 public static void main(String[] args) {  5 String ticketFlag = "100000000000000000";  6 int beginStation = 3;  7 int endStation = 15;  8 long beginTime = System.currentTimeMillis();  9 String result = orderTicket(ticketFlag, beginStation, endStation);  10 if (result.equals(ticketFlag)) {  11 System.out.println("订票失败");  12 } else {  13 System.out.println("订票后的结果：" + result);  14 // 如果要取消的话，就进行这个操作  15 String b = buildTicket(ticketFlag.length(), beginStation,  16  endStation);  17 System.out.println("释放后的结果：" + releaseTicket(ticketFlag, b));  18  19  }  20 long endTime = System.currentTimeMillis();  21 System.out.println("耗时：" + (endTime - beginTime));  22  }  23  24 /**  25  * 订票  26  *  27  * @param ticketFlag  28  * @param beginStation  29  * @param endStation  30  * @return  31 */  32 private static String orderTicket(String ticketFlag, int beginStation,  33 int endStation) {  34 String result = "";  35 if (checkCanTicket(ticketFlag, beginStation, endStation)) {  36 String b = buildTicket(ticketFlag.length(), beginStation,  37  endStation);  38  39 String currentTicked = toTicket(ticketFlag, b);  40 System.out.println("预占票前结果：" + ticketFlag);  41 result = currentTicked;  42 } else {  43 result = ticketFlag;  44  }  45  ;  46 return result;  47  }  48  49 /**  50  * 取消已定票  51  *  52  * @param ticketFlag  53  * @param b  54  * @return  55 */  56 private static String releaseTicket(String ticketFlag, String b) {  57 StringBuilder tempSt = new StringBuilder("");  58 int length = ticketFlag.length();  59 for (int i = 0; i < length; i++) {  60 char tempA = ticketFlag.charAt(i);  61 char tempB = b.charAt(i);  62 if (tempA == '1' && tempB == '1') {  63 tempSt.append("0");  64 } else {  65  tempSt.append(tempA);  66  }  67  }  68 return tempSt.toString();  69  }  70  71 /**  72  * 创建区间占位票  73  *  74  * @param length  75  * @param beginStation  76  * @param endStation  77  * @return  78 */  79 private static String buildTicket(int length, int beginStation,  80 int endStation) {  81 StringBuilder st = new StringBuilder("");  82 for (int i = 0; i < length; i++) {  83 if (i >= beginStation && i < endStation) {  84 st.append("1");  85 } else {  86 st.append("0");  87  }  88  }  89 System.out.println("创建区间票：" + st.toString());  90 return st.toString();  91  }  92  93 /**  94  * 生成订票后的结果  95  *