DBUtils

package fuxi;

import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

public class DBUtils {
    public static final Properties pro=new Properties();
    static{
        InputStream is=DBUtils.class.getResourceAsStream("/db.properties");
        try {
            pro.load(is);
            Class.forName(pro.getProperty("driver"));
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
    public static Connection getConnection() {
        Connection connection=null;
        try {
            connection= DriverManager.getConnection(pro.getProperty("url"),pro.getProperty("user"), pro.getProperty("password"));
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return connection;
    }
    public static void closeAll(Connection connection, PreparedStatement preparedStatement, ResultSet resultSet){
        try {
            if(resultSet!=null){
                resultSet.close();
            }
            if (preparedStatement!=null){
                preparedStatement.close();
            }
            if (connection!=null){
                connection.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}