log4net NHibernate日志配置

protected void Application_Start()
{
    log4net.Config.XmlConfigurator.Configure();
}

<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
  </configSections>
  <log4net>
    <appender name="NHibernateFileLog" type="log4net.Appender.FileAppender">
      <file value="logs/nhibernate.txt" />
      <appendToFile value="false" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%d{yyyy-MM-dd HH:mm:ss.fff} [%t] %-5p %c - %m%n"  />
      </layout>
    </appender>
    <logger name="NHibernate.SQL" additivity="false">
      <level value="DEBUG"/>
      <appender-ref ref="NHibernateFileLog"/>
    </logger>
  </log4net>
</configuration>