我该如何修改这段代码,使得"goals"的值增加10?
if (buffer.empty())
break;
buffer.erase(buffer.size() - 1);
async_query("insert into " + db_name("files") + " ("
+ db_name("player") + ", "
+ db_name("goals") + ", "
+ db_name("completed") + ", "
+ db_name("fid") + ") values " + buffer
+ " on duplicate key update" + " "
+ db_name("player") + " = values("
+ db_name("player") + ")," + " "
+ db_name("goals") + " = values("
+ db_name("goals") + ")," + " "
+ db_name("completed") + " = values("
+ db_name("completed") + "),"
+ " mtime = unix_timestamp()");
buffer.clear();