DBUtils.java

package com.koreait.board3;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtils {
	public static void main(String[] args) {
		try {
			getCon();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	public static Connection getCon() throws Exception {
		final String DRIVER = "com.mysql.cj.jdbc.Driver";
		final String URL = "jdbc:mysql://localhost:3308/boardv3";
		final String USER_NAME = "root";
		final String PASSWORD = "koreait";
		
		Class.forName(DRIVER);
		Connection con=DriverManager.getConnection(URL,USER_NAME,PASSWORD);
		System.out.println("연결 성공!");
		
		return con; //행의 개수를 return 받음
	}
	
	public static void close(Connection con,PreparedStatement ps) {
		close(con,ps, null);
	}
	
	//select때만 rs로 받는다.
	public static void close(Connection con,PreparedStatement ps, ResultSet rs) {
		if(rs!=null) {
			try {rs.close();} catch (SQLException e) {e.printStackTrace();}
		}
		if(ps!=null) {
			try {ps.close();} catch (SQLException e) {e.printStackTrace();}
		}
		if(con!=null) {
			try {con.close();} catch (SQLException e) {e.printStackTrace();}
		}
		//안 닫길 거라서 따로 따로 해준다..?
		
	}
}