以下代码不会产生任何错误,但它似乎也没有做任何事情。
我正在尝试将玩家的统计数据保存到数据库中,如果他/她已经在数据库中,则更新它们。表'playerstats'有列[名称、击杀、死亡、治疗、上限、连胜、mvps]。'name' 是主键。
执行后,表保持不变,就像什么都没发生一样。我究竟做错了什么?
for (String pName : pNames) {
PlayerStats pStats = getStats(pName);
PreparedStatement pstmt = null;
String updateString = "INSERT INTO darkagedb.playerstats VALUES (?,?,?,?,?,?,?) ON DUPLICATE KEY UPDATE name = ?, kills = kills + ?, deaths = deaths + ?, heals = heals + ?, caps = caps + ?, streak = GREATEST(streak,?), mvps = mvps + ?";
try {
conn.setAutoCommit(false);
pstmt = conn.prepareStatement(updateString);
pstmt.setString(1, pStats.name);
pstmt.setInt(2, pStats.kills);
pstmt.setInt(3, pStats.deaths);
pstmt.setInt(4, pStats.heals);
pstmt.setInt(5, pStats.caps);
pstmt.setInt(6, pStats.streak);
pstmt.setInt(7, pStats.mvps);
pstmt.setString(8, pStats.name);
pstmt.setInt(9, pStats.kills);
pstmt.setInt(10, pStats.deaths);
pstmt.setInt(11, pStats.heals);
pstmt.setInt(12, pStats.caps);
pstmt.setInt(13, pStats.streak);
pstmt.setInt(14, pStats.mvps);
conn.commit();
System.out.println("saved stats for " + pStats.name);
saved++;
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (pstmt != null)
pstmt.close();
conn.setAutoCommit(true);
} catch (SQLException e) {
e.printStackTrace();
}
}
}