12.17-javaweb复习

复习内容：做了一些练习题复习sql连接关闭

public class DButils {
    static public Connection connection;
    static public String driver = "com.mysql.cj.jdbc.Driver";
    static public String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC";
    static public String user = "root";
    static public String password = "wang@@ke123";

    static public void Connection_close(Connection connection, PreparedStatement preparedStatement) {
        try {
            if (connection != null)
                connection.close();
            if (preparedStatement != null)
                preparedStatement.close();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }

    static public void Connection_close(Connection connection, PreparedStatement preparedStatement, ResultSet resultSet) {
        try {
            if (resultSet != null)
                resultSet.close();
            if (preparedStatement != null)
                preparedStatement.close();
            if (connection != null)
                connection.close();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }

    static public  Connection GetConnnection() throws ClassNotFoundException, SQLException {
        Class.forName(driver);
        connection= DriverManager.getConnection(url,user,password);
        return connection;
    }
}