commit 713d898251a7f16086685cfcbaf61ee75ee499e8
Author: poopki <poopki2018@gmail.com>
Date:   Sun Jul 10 22:27:50 2022 +0900

    User management base code

diff --git a/DB/DBConnect.java b/DB/DBConnect.java
new file mode 100644
index 0000000..41d68fd
--- /dev/null
+++ b/DB/DBConnect.java
@@ -0,0 +1,40 @@
+package org.poopki.duckdns.user_db.DB;
+
+import java.sql.*;
+
+
+public class DBConnect {
+    private static final String DB_DRIVER_CLASS = "org.mariadb.jdbc.Driver";
+    private static final String DB_URL = "jdbc:mariadb://poopki.duckdns.org:3307/";
+    private static final String DB_USERNAME = "mc_dev";
+    private static final String DB_PASSWORD = "!Rkdalsrn1027";
+
+    public static Connection connectDB(){
+        Connection conn = null;
+        Statement stmt = null;
+        try {
+            Class.forName("org.mariadb.jdbc.Driver");
+
+            conn = DriverManager.getConnection(DB_URL, DB_USERNAME, DB_PASSWORD);
+            System.out.println("Connection success");
+            stmt = conn.createStatement();
+            StringBuilder sb = new StringBuilder();
+            String sql = sb.append("create table if not exists student(")
+                    .append("id int,")
+                    .append("name varchar(20),")
+                    .append("grade int")
+                    .append(");").toString();
+            stmt.execute(sql);
+        }
+        catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+        catch (SQLException e) {
+            // TODO Auto-generated catch block
+            System.err.println("에러 내용 :" + e.getMessage());
+            System.out.println("DB Connection fail");
+        }
+        return conn;
+    }
+
+}
diff --git a/UserInfo.java b/UserInfo.java
new file mode 100644
index 0000000..5f4d3b3
--- /dev/null
+++ b/UserInfo.java
@@ -0,0 +1,23 @@
+package org.poopki.duckdns.user_db;
+
+import org.bukkit.entity.Player;
+
+import java.util.UUID;
+
+public class UserInfo {
+    private UUID m_UUID;
+    private String m_Name;
+
+    UserInfo(Player p){
+        m_UUID = p.getUniqueId();
+        m_Name = p.getName();
+    }
+
+    public String getUserName(){
+        return m_Name;
+    }
+
+    public UUID getUserUUID(){
+        return m_UUID;
+    }
+}
diff --git a/UserInfoArray.java b/UserInfoArray.java
new file mode 100644
index 0000000..b60e700
--- /dev/null
+++ b/UserInfoArray.java
@@ -0,0 +1,22 @@
+package org.poopki.duckdns.user_db;
+
+import org.bukkit.entity.Player;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+public class UserInfoArray {
+    static Map<UUID, UserInfo> m_UserInfoArray = new HashMap<UUID, UserInfo>();
+
+    public void getUserInfo(Player p) {
+        UserInfo m_UserInfo = m_UserInfoArray.get(p.getUniqueId());
+        p.sendMessage(m_UserInfo.getUserName() + m_UserInfo.getUserUUID() + ("중복 입장"));
+    }
+
+    public void putUserInfo(Player p) {
+        m_UserInfoArray.put(p.getUniqueId(), new UserInfo(p));
+        UserInfo m_UserInfo = m_UserInfoArray.get(p.getUniqueId());
+        p.sendMessage(m_UserInfo.getUserName() + m_UserInfo.getUserUUID() + ("초기 입장"));
+    }
+}
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diff --git a/UserJoin.java b/UserJoin.java
new file mode 100644
index 0000000..b8611d5
--- /dev/null
+++ b/UserJoin.java
@@ -0,0 +1,22 @@
+package org.poopki.duckdns.user_db;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+
+public class UserJoin implements Listener {
+    private UserInfoArray m_InfoArray;
+    UserJoin(UserInfoArray m_UIA){
+        m_InfoArray = m_UIA;
+    }
+    @EventHandler
+    public void PlayerLogin(PlayerJoinEvent e) {
+        Player p = e.getPlayer();
+        if(m_InfoArray.m_UserInfoArray.containsKey(p.getUniqueId())){
+            m_InfoArray.getUserInfo(p);
+        }
+        else{
+            m_InfoArray.putUserInfo(p);
+        }
+    }
+}
\ No newline at end of file
diff --git a/User_DB.java b/User_DB.java
new file mode 100644
index 0000000..d910b0f
--- /dev/null
+++ b/User_DB.java
@@ -0,0 +1,24 @@
+package org.poopki.duckdns.user_db;
+
+import org.bukkit.event.Listener;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.poopki.duckdns.user_db.DB.*;
+import java.sql.Connection;
+import java.sql.Statement;
+
+
+public final class User_DB extends JavaPlugin implements Listener {
+    UserInfoArray m_UIA = new UserInfoArray();
+
+    @Override
+    public void onEnable() {
+        // Plugin startup logic
+        Connection conn = new DBConnect().connectDB();
+        getServer().getPluginManager().registerEvents(new UserJoin(m_UIA),this);
+    }
+
+    @Override
+    public void onDisable() {
+        // Plugin shutdown logic
+    }
+}
\ No newline at end of file