Question

我使用自定义ADONetAppender定义基本参数，日期，线程，级别等，但也使用自定义参数appender。似乎在我的Win 7 developmet机器上，运行SQL Server 2008 R2，它工作正常，并添加了特殊参数，它与位列绑定并且是必需的（非空）。

在Win Server 2003计算机上运行该服务（尝试运行SQL Server 2005，另一台运行2008 R2）时，log4net无法将日志附加到数据库，但我的其他appender工作正常。我知道log4net有内部调试，但这是运行服务，所以我没有访问控制台。是否存在不同版本的Windows的兼容性问题，或其他一些建议的调试操作？

如果我要删除额外参数，则会将日志写入数据库。

  <log4net>
    <appender name="LogFileAppender" type="log4net.Appender.FileAppender">
      <param name="File" value="C:\Logs\Log.txt" />
      <param name="AppendToFile" value="true" />
      <param name="ImmediateFlush" value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <param name="Header" value="[Header]&#xD;&#xA;" />
        <param name="Footer" value="[Footer]&#xD;&#xA;" />
        <param name="ConversionPattern" value="%d [%t] %-5p %c %m%n" />
      </layout>
    </appender>
    <appender name="ADONetAppender" type="log4net.Appender.ADONetAppender">
      <bufferSize value="1"/>
      <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
      <connectionString value="Data Source=localhost\SQLEXPRESS;Initial Catalog=mydb;Integrated Security=True"/>
      <commandText value="INSERT INTO Log ([Date],[Thread],[Level],[Logger],[Message],[Exception],[IsCritical]) VALUES&#xD;&#xA;       (@log_date, @thread, @log_level, @logger, @message, 

@exception, @is_critical)"
                                                                       />
      <parameter>
        <parameterName value="@log_date"/>
        <dbType value="DateTime"/>
        <layout type="log4net.Layout.RawUtcTimeStampLayout"/>
      </parameter>
      <parameter>
        <parameterName value="@thread"/>
        <dbType value="String"/>
        <size value="32"/>
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%t"/>
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@log_level"/>
        <dbType value="String"/>
        <size value="512"/>
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%p"/>
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@logger"/>
        <dbType value="String"/>
        <size value="512"/>
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%c"/>
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@message"/>
        <dbType value="String"/>
        <size value="4000"/>
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%m"/>
        </layout>
      </parameter>
      <parameter>
        <parameterName value="@exception"/>
        <dbType value="String"/>
        <size value="2000"/>
        <layout type="log4net.Layout.ExceptionLayout"/>
      </parameter>
      <parameter type="MyApp.Logging.IsCriticalAdoNetParameter">
        <parameterName value="@is_critical"/>
        <dbType value="Boolean"/>
        <size value="10"/>
        <layout type="log4net.Layout.PatternLayout" value=""/>
      </parameter>
    </appender>
    <root>
      <level value="DEBUG" />
      <appender-ref ref="LogFileAppender" />
      <appender-ref ref="ADONetAppender"/>
    </root>
  </log4net>

自定义参数：

   public class IsCriticalAdoNetParameter : AdoNetAppenderParameter
    {
        public override void FormatValue(IDbCommand command, LoggingEvent loggingEvent)
        {
            // Lookup the parameter
            IDbDataParameter param = (IDbDataParameter)command.Parameters[ParameterName];

            // extension method, returns bool.
            param.Value = loggingEvent.IsCritical();
        }
   }

更新，使用具有相同日志记录部分的小型控制台应用程序进行了一些调试。它似乎在炸毁列名。这似乎意味着该列不存在，但它确实存在。我想知道将布尔值转换为实际的SQL数据类型是否存在问题？

log4net: XmlHierarchyConfigurator: Setting Property [Layout] to object [log4net.
Layout.Layout2RawLayoutAdapter]
log4net: XmlHierarchyConfigurator: Setting Collection Property [AddParameter] to
 object [log4net.Appender.AdoNetAppenderParameter]
log4net: SystemInfo: Loaded type [MyApp.Logging.IsCriticalAdoNetPar
ameter] from assembly [MyApp, Version=2.0.0.2929, Culture=neutral,
PublicKeyToken=null] by searching loaded assemblies.
log4net: XmlHierarchyConfigurator: Setting Property [ParameterName] to String va
lue [@is_critical]
log4net: XmlHierarchyConfigurator: Setting Property [DbType] to DbType value [Bo
olean]
log4net: XmlHierarchyConfigurator: Setting Property [Size] to Int32 value [1]
log4net: XmlHierarchyConfigurator: Parameter [layout] specified subtype [log4net
.Layout.PatternLayout]
log4net: XmlHierarchyConfigurator: Performing additional conversion of value fro
m [PatternLayout] to [IRawLayout]
log4net: XmlHierarchyConfigurator: Setting Property [Layout] to Layout2RawLayout
Adapter value [log4net.Layout.Layout2RawLayoutAdapter]
log4net: XmlHierarchyConfigurator: Setting Collection Property [AddParameter] to
 object [MyApp.Logging.IsCriticalAdoNetParameter]
log4net: XmlHierarchyConfigurator: Created Appender [ADONetAppender]
log4net: XmlHierarchyConfigurator: Adding appender named [ADONetAppender] to log
ger [root].
log4net: XmlHierarchyConfigurator: Hierarchy Threshold []
log4net:ERROR [AdoNetAppender] Exception while writing to database
System.Data.SqlClient.SqlException (0x80131904): Invalid column name 'IsCritical
'.
Statement(s) could not be prepared.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolea
n breakConnection)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception
, Boolean breakConnection)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()

Answer 1

首先，我将自定义参数更改为1的大小，因为它是布尔值（位）。虽然这不能解决问题，但这是一个更正确的配置。

  <parameter type="MyApp.Logging.IsCriticalAdoNetParameter">
    <parameterName value="@is_critical"/>
    <dbType value="Boolean"/>
    <size value="1"/>
    <layout type="log4net.Layout.PatternLayout" value=""/>
  </parameter>

最后，似乎通过一些跟踪，自定义参数不是加载的程序集，所以在运行XML Configurator之后，我在引导阶段显式构造了参数。我认为log4net正在努力寻找使用反射的Appender，因为它还不是一个加载的程序集。

    XmlConfigurator.Configure();
    // this ensure the ado net appender is loaded.
    IsCriticalAdoNetParameter adoNetParameter = new IsCriticalAdoNetParameter();

自定义log4net ADONET appender无法在某些机器上运行

1 个答案: