出于某种原因，我无法使用此代码更新我的数据库。有人可以帮我吗？我得到的是，当玩家完成某项任务时，当且仅当他们的时间低于最佳记录时间时，它才会记录他们花费的时间。
public void setScores(MapleCharacter chr, int mapid, float time) {
Connection con1 = DatabaseConnection.getConnection();
try {
PreparedStatement ps;
ps = con1.prepareStatement("SELECT time from jumpquests WHERE characterid = ? AND mapid = ?");
ps.setInt(1, chr.getId());
ps.setInt(2, chr.getMapId());
ResultSet rs = ps.executeQuery();
if (rs.next()) {
if (time < rs.getFloat("time")) {
executeScores(chr, mapid, time);
}
} else {
executeScores(chr, mapid, time);
}
rs.close();
ps.close();
} catch (Exception Ex) {
System.out.println("Ran into exception.");
}
}
public void executeScores(MapleCharacter chr, int mapid, float time) {
System.out.println("Setting scores for " + chr.getName() + " for map " + mapid + " at time " + time);
Connection con1 = DatabaseConnection.getConnection();
try {
PreparedStatement ps = con1.prepareStatement("REPLACE INTO jumpquests (characterid, mapid, time) values (?,?,?)");
ps.setInt(1, chr.getId());
ps.setInt(2, chr.getMapId());
ps.setFloat(3, time);
ps.close();
} catch (Exception e) {
System.out.println("Executing scores ran into exception.");
}
}
最佳答案
我不确定与 JAVA 相关的任何内容，但您的 REPLACE INTO SQL 语句包含保留字 time，需要使用 backtique 进行转义，例如以下。参见 MySQL Documentation获取更多信息。
REPLACE INTO jumpquests (characterid, mapid, time) values (?,?,?)
^........Here
应该是
REPLACE INTO jumpquests (characterid, mapid, `time`) values (?,?,?)
关于java - MySQL 不执行 (Java)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31125714/