e243. getting the driver of a connection.txt

这里面包含了一百多个JAVA源文件

Given a connection, it is not possible to determine the driver that created the connection. Although the connection can return a driver name, the returned name cannot be used to find the driver. For example, 
    try {
        DatabaseMetaData dmd = connection.getMetaData();
        String driverName = dmd.getDriverName();  // Mark Matthew's MySQL Driver
    } catch (SQLException e) {
    }

The best you can do is to use the URL used to create the connection: 
    try {
        // Create connection from URL
        Connection conn = DriverManager.getConnection(url, username, password);
    
        // Get driver from URL
        Driver driver = DriverManager.getDriver(url);
    } catch (SQLException e) {
    }