Save Log Information in Database with log4net and NHibernate

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net"
      type="log4net.Config.Log4NetConfigurationSectionHandler,log4net-net-1.0" />
  </configSections>
  <log4net>
      <logger name="NHibernateLogging">
      <level value="DEBUG"/>
    </logger>
    <root>
      <level value="WARN" />
      <appender-ref ref="HibernateAdoNetAppender" />
    </root>
    <!-- Using standard AdoNet Appender -->
    <appender name="HibernateAdoNetAppender" type="log4net.Appender.AdoNetAppender">
      <!-- Use our connection class -->
      <connectionType value="HLogger.HDbConnection, HLoggerLibrary" />
      <!-- Sql insert query with parameters-->
      <commandText value="INSERT INTO Log (Date,Thread,Level,Logger,Message) VALUES (:log_date, :thread, :log_level, :logger, :message)" />
      <!-- Parameters-->
      <parameter>
        <parameterName value="log_date" />
        <dbType value="DateTime" />
        <layout type="log4net.Layout.PatternLayout" value="%date{yyyy'-'MM'-'dd HH':'mm':'ss'.'fff}" />
      </parameter>
      <parameter>
        <parameterName value="thread" />
        <dbType value="String" />
        <size value="255" />
        <layout type="log4net.Layout.PatternLayout" value="%thread" />
      </parameter>
      <parameter>
        <parameterName value="log_level" />
        <dbType value="String" />
        <size value="50" />
        <layout type="log4net.Layout.PatternLayout" value="%level" />
      </parameter>
      <parameter>
        <parameterName value="logger" />
        <dbType value="String" />
        <size value="255" />
        <layout type="log4net.Layout.PatternLayout" value="%logger" />
      </parameter>
      <parameter>
        <parameterName value="message" />
        <dbType value="String" />
        <size value="4000" />
        <layout type="log4net.Layout.PatternLayout" value="%message" />
      </parameter>
    </appender>
  </log4net>
</configuration>