public SeatInfo() {
File file = new File(".", "data");
file.mkdir();
File f = new File(file, "SeatInfo.txt");
try {
raf = new RandomAccessFile(f, "rw");
if (raf.length() == 0) {
raf.setLength(31 * 4 * FLIGHT_PER_DAY);
for (int i = 0; i < 31 * FLIGHT_PER_DAY; i++) raf.writeInt(0);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public int dingPiao(String flightNum, String day, int seats) {
int leftSeats = 0;
try {
long index = cacuIndex(day);
long address = cacuAddr(flightNum);
long absoluteAddress = index + address;
raf.seek(absoluteAddress);
int bookedSeats = raf.readInt();
String sqlString = "select seat,week from flight where flight='" + flightNum + "' ";
ResultSet rs = sqlConnection.executeQuery(sqlString);
int totalSeats = 0;
String week = "";
while (rs.next()) {
totalSeats = rs.getInt(1);
week = rs.getString(2);
}
String c = isAbsence(day);
int flag = 0;
for (int i = 0; i < week.length(); i++) {
String w = week.substring(i, i + 1);
if (c.equals(w)) {
flag = 1;
break;
}
}
if (flag == 1) {
leftSeats = totalSeats - bookedSeats;
if (leftSeats >= seats) {
raf.seek(absoluteAddress);
raf.writeInt(bookedSeats + seats);
return -1;
} else return leftSeats;
} else return -2;
} catch (Exception e) {
e.printStackTrace();
}
return leftSeats;
}
public void tuiPiao(String flightNum, String day, int seats) {
try {
long index = cacuIndex(day);
long address = cacuAddr(flightNum);
long absoluteAddress = index + address;
raf.seek(absoluteAddress);
int bookedSeats = raf.readInt();
if (bookedSeats < seats)
JOptionPane.showMessageDialog(null, "退票数大于已定票数!", "错误信息", JOptionPane.ERROR_MESSAGE);
else {
raf.seek(absoluteAddress);
raf.writeInt(bookedSeats - seats);
}
} catch (Exception e) {
}
}
public boolean isFull(String flightNum, String day) {
try {
long index = cacuIndex(day);
long address = cacuAddr(flightNum);
long absoluteAddress = index + address;
raf.seek(absoluteAddress);
int bookedSeats = raf.readInt();
String sqlString = "select seat from flight where flight='" + flightNum + "'";
ResultSet rs = sqlConnection.executeQuery(sqlString);
int totalSeats = 0;
while (rs.next()) totalSeats = rs.getInt(1);
if (totalSeats == bookedSeats) return true;
else return false;
} catch (Exception e) {
return false;
}
}
