Merge pull request 'Add TeamTeilnahme' (#118) from TeamTeilnahme into master

Reviewed-on: #118
Reviewed-by: Lixfel <lixfel@steamwar.de>

SpigotCore_Main/src/de/steamwar/sql/TeamTeilnahme.java

@@ -0,0 +1,54 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2020  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.sql;
+
+import java.sql.ResultSet;
+import java.util.HashSet;
+import java.util.Set;
+
+public class TeamTeilnahme {
+    private TeamTeilnahme(){}
+
+    private static final SQL.Statement byEventTeam = new SQL.Statement("SELECT * FROM TeamTeilnahme WHERE TeamID = ? AND EventID = ?");
+    private static final SQL.Statement byEvent = new SQL.Statement("SELECT * FROM TeamTeilnahme WHERE EventID = ?");
+    private static final SQL.Statement byTeam = new SQL.Statement("SELECT * FROM TeamTeilnahme WHERE TeamID = ?");
+
+    public static boolean nimmtTeil(int teamID, int eventID){
+        return byEventTeam.select(ResultSet::next, teamID, eventID);
+    }
+
+    public static Set<Team> getTeams(int eventID){
+        return byEvent.select(rs -> {
+            Set<Team> teams = new HashSet<>();
+            while(rs.next())
+                teams.add(Team.get(rs.getInt("TeamID")));
+            return teams;
+        }, eventID);
+    }
+
+    public static Set<Event> getEvents(int teamID){
+        return byTeam.select(rs -> {
+            Set<Event> events = new HashSet<>();
+            while(rs.next())
+                events.add(Event.get(rs.getInt("EventID")));
+            return events;
+        }, teamID);
+    }
+}