java - How to load playerdata correctly and avoid it from getting the old data -

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i have problem bungeecord server network.

basicly problem have stated in title when load playerdata mysql database loads old data instead of new playerdata saved on playerquitevent(playerkickevent) , reloaded instantly on playerjoinevent in server.

here steps can reproduce problem:

  • setup bungeecord network 2 servers , sql methods:
  • on playerquitevent(player switch server) store data mysql database(example: rank: vip)

problem: since data doesn't update instantly causes load old data before player quit event

  • on playerjoinevent(player switched server) load data stored on playerquitevent

my code: save method:

public void savefields(string uuid, map<string, string> fields) {     (final string s : fields.keyset()) {         if (s.equalsignorecase("uuid")) continue;         if (s.equalsignorecase("id")) continue;         createcolumn(database + "_data", s);         sendupdatequery("update " + database + "_data set " + s + "='" + fields.get(s) + "' uuid='" + uuid + "'");     } }

load method:

public map<string, string> getfields(string uuid) {     map<string, string> map = new hashmap<>();     resultset rs = null;     preparedstatement st = null;     try {         st = con.preparestatement("select * " + database + "_data uuid=?");         st.setstring(1, uuid);         rs = st.executequery();         (string colum : getcolumns(rs)) {             rs.first();             if (rs.getrow() != 0) {                 map.put(colum, rs.getstring(colum));             }         }     } catch (sqlexception e) {         e.printstacktrace();     } {         closeresources(rs, st);     }     closeresources(rs, st);     return map; }

this behaviour known race condition. mysql bad database , therefore has problem. workaround it, have query reasonable relay in second event when player relogs, or force player wait before relogging (which approach taken minigame proxy servers), effective ditch mysql , use proper database.


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