JDBCパッケージDBUtil

import java.sql.*;

public class DBUtil {
	public static Connection getConnection(){
		Connection conn = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://localhost/test","root","root");
		} catch (Exception e) {
			e.printStackTrace();
		}
		return conn;
	}
	
	public static PreparedStatement prepare(Connection conn,String sql){
		PreparedStatement ps = null;
		try {
			ps = conn.prepareStatement(sql);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return ps;
	}
	
	public static void closeConnection(Connection conn){
		if(null != conn){
			try {
				conn.close();
				conn = null;
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}
	
	public static void closePreparedStatement(PreparedStatement ps){
		if(null != ps){
			try {
				ps.close();
				ps = null;
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}
	
	public static void closeResultSet(ResultSet rs){
		if(null != rs){
			try {
				rs.close();
				rs = null;
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}
}