Refactored query to fetch player identity

* Database relations have changed: Multiple players can have same ingame identity now.
* Simplified config for game tables by using id placeholder instead of prefix and postfix.

src_coffee/server/config.coffee

@@ -77,8 +77,8 @@ module.exports =
     SQL_TABLES:
         GAMES_LIST: 'game_worlds'                # The name of the table in common db, which contains the list of game worlds
-        PREFIX_GAME_TABLE: 'game_'               # The name prefix of tables in game db, which contain data of a game world's contents
-        POSTFIX_GAME_PLAYERS: '_players'         # The name postfix of the game table, which contains the list of a game world's players
+        PLAYER_GAMES: 'player_games'             # The name of the table in common db, which maps a player to a game world (and an identity)
+        GAME_PLAYER_IDENTITIES: 'game_<id>_identities'  # The name of the table in game db, which contains the player identities of a related game (With <id> as a placeholder for the game ID)
         CHANNEL_LIST: 'chat - channels'          # The name of the table for storing non-game/custom channels (Must be created, see database_setup.sql)
         CHANNEL_JOININGS: 'chat - channeljoins'  # The name of the table for storing user joins to custom channels (Must be created, see database_setup.sql)

src_coffee/server/database.coffee

@@ -134,8 +134,8 @@ class Database
     _getGameDatabaseName: (gameMetaData) ->
         return "#{Config.SQL_DATABASE_PREFIX_GAME}#{gameMetaData.database_id}"
-    _getGameTableName: (gameMetaData, tablePostfix) ->
-        return "#{Config.SQL_TABLES.PREFIX_GAME_TABLE}#{gameMetaData.game_id}#{tablePostfix}"
+    _getGameTableName: (gameMetaData, tableNameSkeleton) ->
+        return tableNameSkeleton.replace('<id>', gameMetaData.game_id)
     # Returns the current security token for the given player. This token must be send on auth request by the client.
     _getSecurityToken: (idUser, playerData) ->
@@ -389,11 +389,14 @@ class Database
         # Read data of given player in given game
         promise = promise.then (gameData) =>
             gameDatabase = @_getGameDatabaseName(gameData)
-            playersTable = @_getGameTableName(gameData, Config.SQL_TABLES.POSTFIX_GAME_PLAYERS)
+            playerIdentitiesTable = @_getGameTableName(gameData, Config.SQL_TABLES.GAME_PLAYER_IDENTITIES)
             sql = "
-                    SELECT `ID` AS `game_identity_id`, `Folkname` AS `game_identity_name`, `LastActivityStamp` AS `activity_stamp`
-                    FROM `#{gameDatabase}`.`#{playersTable}`
-                    WHERE `UserID`=#{@_toQuery(idUser)}
+                    SELECT `I`.`ID` AS `game_identity_id`, `I`.`Folkname` AS `game_identity_name`, `I`.`LastActivityStamp` AS `activity_stamp`
+                    FROM `#{Config.SQL_TABLES.PLAYER_GAMES}` AS `PG`
+                    JOIN `#{gameDatabase}`.`#{playerIdentitiesTable}` AS `I`
+                      ON `I`.`ID`=`PG`.`FolkID`
+                    WHERE `PG`.`GalaxyID`=#{@_toQuery(idGame)}
+                      AND `PG`.`UserID`=#{@_toQuery(idUser)}
                   "
             return @_readSimpleData(sql, true)