使用Log4net把日志写入到SqlServer数据库

1、官网URL： http://logging.apache.org/log4net/ 

2、配置文件参照URL： http://logging.apache.org/log4net/release/config-examples.html 

3、在Web.config中加入以下代码 

　　3.1：在configSections中加入 

　　　　<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>　　　　

　　

<configSections>
    <!--Log4net的配置-->
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
    
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
  </configSections>

　　3.2：log4net节点配置如下　　

　　

<!--Log4net的配置-->
  <log4net>
    <!--本地Text文件-->
    <appender name="LogFileAppender" type="log4net.Appender.FileAppender" >
      <param name="File" value="c:Log4DBLog.txt" />
      <param name="AppendToFile" value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%d [%t] %-5p %c [%x] - %m%n" />
      </layout>
    </appender>

    <!--SQL数据库-->
    <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
      <bufferSize value="1" />
      <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
      <connectionString value="data source=[database server];initial catalog=[database name];integrated security=false;persist security info=True;User ID=[user];Password=[password]" />
    <commandText value="INSERT INTO Log ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@log_date, @thread, @log_level, @logger, @message, @exception)" />
      <parameter>
        <parameterName value="@log_date" />
        <dbType value="DateTime" />
        <layout type="log4net.Layout.RawTimeStampLayout" />
      </parameter>
      <parameter>
        <parameterName value="@thread" />
        <dbType value="String" />
        <size value="255" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%thread" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@log_level" />
        <dbType value="String" />
        <size value="50" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%level" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@logger" />
        <dbType value="String" />
        <size value="255" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%logger" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@message" />
        <dbType value="String" />
        <size value="4000" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%message" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@exception" />
        <dbType value="String" />
        <size value="2000" />
        <layout type="log4net.Layout.ExceptionLayout" />
      </parameter>
    </appender>

    <root>
      <!-- Set this to "ERROR" before release -->
      <!--Highest: OFF->FATAL->RROR->WARN->INFO->DEBUG->ALL :Lowest -->
      <level value="ALL" />
      <appender-ref ref="AdoNetAppender" />
      <!-- <appender-ref ref="SmtpAppender" /> -->
      <!--<appender-ref ref="FileAppender" /> -->
    </root>

  </log4net>

4、在AssemblyInfo.cs中加入以下两行代码

　　using log4net;

　　[assembly: log4net.Config.XmlConfiguratorAttribute(Watch = true)]

5、代码调用测试如下：　　

private static readonly log4net.ILog log = log4net.LogManager.GetLogger(typeof(HomeController));

        public ActionResult Index()
        {
            log.Info("自定义Info级别的信息");
            log.Error("error", new Exception(" error 信息 。。。"));
            log.Fatal("fatal", new Exception(" fatal 信息 。。。"));
            log.Info("info", new Exception(" info 信息 。。。"));
            log.Debug("debug", new Exception(" debug 信息 。。。"));
            log.Warn("warn", new Exception(" warn 信息 。。。"));

            return View();
        }

 6、效果如下：

7、建表SQL语句：

CREATE TABLE [dbo].[Log] (
    [Id] [int] IDENTITY (1, 1) NOT NULL,
    [Date] [datetime] NOT NULL,
    [Thread] [varchar] (255) NOT NULL,
    [Level] [varchar] (50) NOT NULL,
    [Logger] [varchar] (255) NOT NULL,
    [Message] [varchar] (4000) NOT NULL,
    [Exception] [varchar] (2000) NULL
)