/// <summary>
/// 设置新的驱动
/// </summary>
/// <param name="connectName"></param>
public void SetProvider(string connectName)
{
SetProvider(ProviderFactory.CreateDbProvider(connectName));
}
/// <summary>
/// 指定配制节名实例化一个Session会话
/// </summary>
/// <param name="connectName"></param>
public DbSession(string connectName)
: this(ProviderFactory.CreateDbProvider(connectName))
{
}