Question

我正在使用 log4net 登录 mysql 数据库。 log4net 配置是正确的，因为我已经测试登录 sql server 和文件，但是当我在 mysql 数据库中写入日志时，它会提示我错误。

我的 log4net 配置如下

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>  
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>  
  </configSections>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6"/>
    </startup>

  <log4net>
    <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
      <bufferSize value="1" />
      <connectionType value="MySql.Data.MySqlClient.MySqlConnection, MySql.Data" />
      <connectionString value="Server=127.0.0.1;Database=logdb;Uid=abc;Pwd=abc;" />
      <commandText value="INSERT INTO log (timestamp,Thread,Level,Logger,Message) VALUES (?log_date, ?thread, ?log_level, ?logger, ?message);" />
      <parameter>
        <parameterName value="?log_date" />
        <dbType value="DateTime" />
        <layout type="log4net.Layout.RawTimeStampLayout" />
      </parameter>
      <parameter>
        <parameterName value="?thread" />
        <dbType value="String" />
        <size value="32" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%thread" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="?log_level" />
        <dbType value="String" />
        <size value="32" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%level" />
        </layout>
      </parameter>
      <parameter>
        <parameterName value="?logger" />
        <dbType value="String" />
        <size value="256" />
        <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>
      
    </appender>
    <root>
      <level value="ALL" />
      <appender-ref ref="AdoNetAppender" />
    </root>
  </log4net>
  
  <appSettings>
    <add key="log4net.Internal.Debug" value="true"/>
  </appSettings>

<system.diagnostics>
    <trace autoflush="true">
      <listeners>
        <add name="textWriterTraceListener" type="System.Diagnostics.TextWriterTraceListener" initializeData="C:\Logs\log4net.txt"/>
      </listeners>
    </trace>
  </system.diagnostics>
</configuration>

日志消耗代码在这里

 class Program
        {
            private static readonly ILog Logger = LogManager.GetLogger(System.Environment.MachineName);
    
            static void Main(string[] args)
            {
                log4net.Config.XmlConfigurator.Configure();
    
                Logger.Info("Testing information log from .Net app");
                Logger.Debug("Testing Debug log from .Net app");
                Logger.Fatal("Testing Fatal log from .Net app");
            }
        }

我也是 “[assembly: log4net.Config.XmlConfigurator(ConfigFile = "Web.config", Watch = true)] ” 汇编文件中的这一行。我遇到的错误是

**

log4net:ERROR [AdoNetAppender] ErrorCode: GenericFailure. Exception while writing to database
System.InvalidOperationException: Parameter '?log_date' was not found during prepare.
   at MySql.Data.MySqlClient.PreparableStatement.Prepare()
   at MySql.Data.MySqlClient.MySqlCommand.Prepare(Int32 cursorPageSize)
   at MySql.Data.MySqlClient.MySqlCommand.Prepare()
   at log4net.Appender.AdoNetAppender.SendBuffer(IDbTransaction dbTran, LoggingEvent[] events)
   at log4net.Appender.AdoNetAppender.SendBuffer(LoggingEvent[] events)
log4net: Shutdown called on Hierarchy [log4net-default-repository]

**

但实际上我正在传递所有必需的参数，但不知道为什么会出现此错误。

任何人都可以指导。

Answer 1

这是 MySql.Data 中的一个错误。据我所知，没有针对它提交的错误报告，但是您可以从 MySqlConnector integration tests 中看到，如果在添加参数之前调用 MySqlCommand.Prepare，MySql.Data 会失败。

然而，这正是 what AdoNetAppender does。（该代码中有一个 try/catch 块，但这是 2.0.12 之后的最新更改。）

有两种可能的修复：

切换到 MySqlConnector 并更改 <connectionType /> 以使用它。
将 IgnorePrepare=true 添加到您的 MySql.Data 连接字符串，这将导致 Prepare 成为空操作。

Answer 2

正如@Bradley Grainger 提到的，MySqlConnector 完成了这项工作

遗憾的是，我无法发表评论，但@hashimkayani 要求举个例子，我确实试过了，而且效果很好：

<?xml version="1.0"?>
<configuration>
    <configSections>
        <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
    </configSections>
    <appSettings>
        <add key="log4net.Internal.Debug" value="true"/>
    </appSettings>
    <log4net>
        <appender name="dbAppender" type="log4net.Appender.AdoNetAppender">
            <bufferSize value="1" />
            <connectionType value="MySqlConnector.MySqlConnection, MySqlConnector" />
            <connectionString value="Server=localhost;Database=dbName;Uid=dbUser;Pwd=dbPassword;persistsecurityinfo=True;SslMode=none;" />
            <commandText value="INSERT INTO afmlog(date, thread, level, logger, message) VALUES (@log_date, @thread, @log_level, @logger, @message);" />
            <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>
    <system.diagnostics>
        <trace autoflush="true">
            <listeners>
                <add
                    name="textWriterTraceListener"
                    type="System.Diagnostics.TextWriterTraceListener"
                    initializeData="C:\temp\log4net.txt" />
            </listeners>
        </trace>
    </system.diagnostics>
</configuration>

mysql 数据库日志记录中的 log4net 日志记录错误

2 个答案: