Project.The_SEED/DB/DBUpdate.java

package org.poopki.duckdns.user_db.DB;

import org.poopki.duckdns.user_db.UserInfo;
import org.poopki.duckdns.user_db.UserInfoArray;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.UUID;

public class DBUpdate {
    private static final String DB_DRIVER_CLASS = "org.mariadb.jdbc.Driver";
    private static final String DB_URL = "jdbc:mariadb://poopki.duckdns.org:3307/mc_dev";
    private static final String DB_USERNAME = "mc_dev";
    private static final String DB_PASSWORD = "!Rkdalsrn1027";
    private static UserInfoArray m_InfoArrayInstance;

    public DBUpdate(UserInfoArray m_UIA){
        m_InfoArrayInstance = m_UIA;
    }

    public static void InitDB() throws SQLException {
        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 UserInfo(")
                    .append("UUID varchar(36) PRIMARY KEY,")
                    .append("Nation int(8),") //public
                    .append("Squad int(8),")  //public
                    .append("Farm int(8)") //public
                    /*
                    .append("Occupation int(8),") //private
                    .append("Account int(8),") //private
                    .append("Status int(8)") //private*/
                    .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");
        }
        finally {
            if( conn != null && !conn.isClosed()){
                conn.close();
            }
        }
    }
    public static void LoadDB() throws SQLException {
        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();
            String sql =  "SELECT * FROM UserInfo";
            ResultSet rs = stmt.executeQuery(sql);

            while(rs.next()){
                m_InfoArrayInstance.m_UserInfoArray.put(UUID.fromString(rs.getString(1)), new UserInfo(UUID.fromString(rs.getString(1)),
                                                                                                                 Integer.parseInt(rs.getString(2)),
                                                                                                                 Integer.parseInt(rs.getString(3)),
                                                                                                                 Integer.parseInt(rs.getString(4))));
            }

        }  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");
        }finally{
            if(conn != null && !conn.isClosed()){
                conn.close();
            }
        }
    }


    public void UpdateDB() throws SQLException {
        Connection conn = null;
        PreparedStatement pstmt = null;

        try{
            Class.forName("org.mariadb.jdbc.Driver");
            conn = DriverManager.getConnection(DB_URL, DB_USERNAME, DB_PASSWORD);

            for (UUID key : m_InfoArrayInstance.m_UserInfoArray.keySet()) {
                //sql = sb.append("insert into UserInfo values('"+key+"',"+0+","+0+","+0+","+0+","+0+")").toString();
                //String sql = sb.append("insert into UserInfo values ('test', 0)").toString();
                //stmt.execute(sql);
                String sql = "REPLACE INTO UserInfo VALUES (?,?,?,?)";
                pstmt = conn.prepareStatement(sql);
                //pstmt.setString(1, key.toString());
                pstmt.setString(1, String.valueOf(m_InfoArrayInstance.m_UserInfoArray.get(key).getUserUUID()));
                pstmt.setString(2, String.valueOf(11));
                pstmt.setString(3, String.valueOf(23));
                pstmt.setString(4, String.valueOf(56));

                int cnt = pstmt.executeUpdate();
                if( cnt == 0 ){
                    System.out.println("데이터 입력 실패");
                }
                else{
                    System.out.println("데이터 입력 성공");
                }

            }
        }
        catch(ClassNotFoundException e){
            e.printStackTrace();
        }
        catch(SQLException e){
            System.err.println("에러 내용 :" + e.getMessage());
            System.out.println("DB Connection fail");
        }
        finally {
            if( conn != null && !conn.isClosed()){
                conn.close();
            }
        }
    }
}