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log4net logging error in mysql database logging

i am using log4net for logging in mysql database. log4net configuration is correct and because i have tested to log in sql server and in file but when i'm writing logs in mysql database then it prompt an error to me.
my log4net config is below
<?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>
and the log consuming code is here
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");
}
}
i also the
"[assembly: log4net.Config.XmlConfigurator(ConfigFile = "Web.config", Watch = true)]
"
this line in assembly file.
the error i'm encountering is
**
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]
**
but actually I'm passing all required parameters dnt know why I'm getting this error.
can anyone guide.

This is a bug in MySql.Data. There isn't a bug report filed for it as far as I know, but you can see from the MySqlConnector integration tests that MySql.Data fails if you call MySqlCommand.Prepare before adding the parameters.
However, that's exactly what AdoNetAppender does. (There is a try/catch block in that code, but that's a recent change, after 2.0.12.)
There are two possible fixes:
Switch to MySqlConnector and change the <connectionType /> to use it.
Add IgnorePrepare=true to your MySql.Data connection string, which will cause Prepare to be a no-op. (Note: this option was removed in 8.0.24.)

As #Bradley Grainger mentioned, MySqlConnector does the job
I sadly cannot comment but #hashimkayani asked for an example, I did try it out and it works perfectly fine:
<?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>

Logging into Database using log4net and Microknights in asp.net core 3.1 didn't work

I have gone through many articles saying AdoNetAppender is not supported in .net core, but we can use MicroKnights to do the same.
I am trying to achieve DB logging in .net core 3.1 application using the same but still not succeed.
My log4net.config file placed in roots is as follows:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net debug="true">
<appender name="AdoNetAppender" type="MicroKnights.Logging.AdoNetAppender, MicroKnights.Log4NetAdoNetAppender">
<bufferSize value="1" />
<connectionType value="System.Data.SqlClient.SqlConnection,System.Data.SqlClient,Version=4.0.0.0,Culture=neutral,PublicKeyToken=b77a5c561934e089" />
<connectionStringName value="log4net" />
<connectionStringFile value="appsettings.json" />
<commandText value="INSERT INTO ApplicationLog(ApplicationID, CreateDate, LogLevel, Message, Exception)
VALUES (#ApplicationID, #CreateDate, #LogLevel, #Message, NULLIF(#Exception,''))" />
<!--<commandText value="dbo.sp_InsertApplicationLog" />
<commandType value="StoredProcedure" />-->
<parameter name="ApplicationID">
<parameterName value="#ApplicationID" />
<dbType value="Int16" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%property{ApplicationID}" />
</layout>
</parameter>
<parameter name="CreateDate">
<parameterName value="#CreateDate" />
<dbType value="DateTime" />
<layout type="log4net.Layout.RawTimeStampLayout" />
</parameter>
<parameter name="LogLevel">
<parameterName value="#LogLevel" />
<dbType value="AnsiString" />
<size value="20" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%level" />
</layout>
</parameter>
<parameter name="Message">
<parameterName value="#Message" />
<dbType value="AnsiString" />
<size value="2000" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%message" />
</layout>
</parameter>
<parameter name="Exception">
<parameterName value="#Exception" />
<dbType value="AnsiString" />
<size value="4000" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%exception" />
</layout>
</parameter>
<threshold value="DEBUG"/>
<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="DEBUG" />
<levelMax value="ERROR" />
</filter>
</appender>
<!--<root>
<level value="DEBUG" />
<appender-ref ref="RollingFileAppender" />
<appender-ref ref="AdoNetAppender" />
</root>-->
<root>
<level value="ALL"/>
<appender-ref ref="RollingFileAppender" />
<appender-ref ref="AdoNetAppender" />
</root>
</log4net>
</configuration>
My startup.cs file calling AddLog4Net() method.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddLog4Net();
}
And I am trying to log in database is like this,
private static readonly string LOG_CONFIG_FILE = #"log4net.config";
private static readonly ILog log = LogManager.GetLogger(typeof(Log4NetLoggingService));
private static void SetLog4NetConfiguration()
{
XmlDocument log4netConfig = new XmlDocument();
log4netConfig.Load(File.OpenRead(LOG_CONFIG_FILE));
var repo = LogManager.CreateRepository(
Assembly.GetEntryAssembly(), typeof(log4net.Repository.Hierarchy.Hierarchy));
log4net.Config.XmlConfigurator.Configure(repo, log4netConfig["log4net"]);
AdoNetAppenderHelper.SetConnectionString(Configuration
.GetSection("Data:Logging")
.GetSection("DbConnectionString").Value);
}
public void LogError(Exception exception)
{
var message = string.IsNullOrEmpty(exception.Source) ? exception.Message : exception.Source;
SetLog4NetConfiguration();
log.Error(message, exception);
}
I cannot understand where I am wrong, but I tried my best but didn't succeed.

For .Net Core 3.1, Microsoft has changed path for the SqlClient library.
So you have to update the connectionType element inside the log4net.config to:
<connectionType value="Microsoft.Data.SqlClient.SqlConnection, Microsoft.Data.SqlClient, Version=1.0.0.0,Culture=neutral,PublicKeyToken=23ec7fc2d6eaa4a5"/>
You can find more details here microknights/Log4NetAdoNetAppender Github README.md

Using stored procedures in log4net configuration

I'm trying to use log4net in my C# console application. I'm not too sure how this is used with stored procedures. With the configuration info below, how exactly will doing something like log.Info("message here") execute the stored procedure with parameters if all I pass is the message string?
I'm using SQL Server Express as database. In AssemblyInfo.cs I've added the following line:
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
From what I've found here on StackOverflow, I have the following in my app.config:
<root>
<level value="DEBUG" />
<appender-ref ref="FileAppender" />
<appender-ref ref="ConsoleAppender" />
<appender-ref ref="AdoNetAppender" />
</root>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
<bufferSize value="100" />
<connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral" />
<connectionString value="data source=MyPC\\SQLEXPRESSPC;initial catalog=MyDBName;integrated security=false;persist security info=True;User ID=MyDBUser;Password=MyDBPassword" />
<commandText value="InsertGoogleDriveLog" />
<commandType value="StoredProcedure" />
<parameter>
<parameterName value="#user_name" />
<dbType value="String" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%username" />
</layout>
</parameter>
<parameter>
<parameterName value="#message_text" />
<dbType value="String" />
<size value="1024" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%message" />
</layout>
</parameter>
</appender>
In my logger class I have the line:
log.Info("OK, here we are");
Also, I removed , PublicKeyToken=b77a5c561934e089 from the connectionType string value, as I'm not sure where this is obtained from when I copied it from the question here.

it seems you are missing some elements in your configuration (log4net -> should contain the root and appender elements):
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<log4net>
<root>
<level value="DEBUG" />
<appender-ref ref="AdoNetAppender" />
</root>
<appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
<bufferSize value="100" />
<connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral" />
<connectionString value="data source=MyPC\\SQLEXPRESSPC;initial catalog=MyDBName;integrated security=false;persist security info=True;User ID=MyDBUser;Password=MyDBPassword" />
<commandText value="InsertGoogleDriveLog" />
<commandType value="StoredProcedure" />
<parameter>
<parameterName value="#user_name" />
<dbType value="String" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%username" />
</layout>
</parameter>
<parameter>
<parameterName value="#message_text" />
<dbType value="String" />
<size value="1024" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%message" />
</layout>
</parameter>
</appender>
</log4net>

log4net does not write log into SQL Server

I'm trying to log using log4net into my database. I've installed log4net using NuGet and set up my web.config like this:
<configSections>
<!-- Log4Net -->
<section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net>
<!--AdoNet appender is use for write log file into SQL Server-->
<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=localhost/SVILUPPO;Initial Catalog=MIODB;user id=sa;password=myPassword;" />
<commandText value="INSERT INTO AppLog ([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>
<!--Add appender which you want to use, You can add more then one appender . Like if you want save log both plain text or sql server ,Add both appender.-->
<root>
<level value="ALL" />
<appender-ref ref="AdoNetAppender" />
<!--Enable this line if you want write log file into sql server-->
</root>
</log4net>
Then I set in my global.asax the call to the configuration:
log4net.Config.XmlConfigurator.Configure();
And this in the page where I want get and save the log
private static ILog log = LogManager.GetLogger(typeof(Login));
log.Debug("Debug message");
log.Warn("Warn message");
log.Error("Error message");
log.Fatal("Fatal message");
but nothing happens :(
Can anyone help me please?

To find the error you can best enable internal debugging in log4net. An error in log4net will not go to your application. You can write it to a log and then see why your logging is not working.
In your app.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="log4net.Internal.Debug" value="true"/>
</appSettings>
...
<system.diagnostics>
<trace autoflush="true">
<listeners>
<add
name="textWriterTraceListener"
type="System.Diagnostics.TextWriterTraceListener"
initializeData="C:\tmp\log4net.txt" />
</listeners>
</trace>
</system.diagnostics>
</configuration>
Log4net FAQ

log4net use a different xml config file when in DEBUG mode compared to RELEASE mode

I have a webapp that I would like to use a different log4net config file when running under DEBUG mode compared to running under RELEASE mode.
I am using log4net version 2.0.3.
In my AssemblyInfo.cs class I have this code:
#if DEBUG
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4netDebug.xml", Watch = true)]
#else
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4netLive.xml", Watch = true)]
#endif
In my Global.asax.cs class I have this code:
log4net.Config.XmlConfigurator.Configure();
log = LogManager.GetLogger(typeof(GlobalApp));
(log is a public static member of GlobalApp.)
In my log4netDebug.xml file I have this code:
<?xml version="1.0" encoding="utf-8"?>
<!-- Configuration for logging using log4net-->
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net>
<!-- Show logging in the Visual Studio output window-->
<appender name="TraceAppender"
type="log4net.Appender.TraceAppender" >
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%-6level - %message%newline" />
</layout>
</appender>
<appender
name="AdoNetAppender"
type="log4net.Appender.AdoNetAppender">
<threshold>INFO</threshold>
<bufferSize
value="1" />
<connectionType
value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
<connectionString value="data source=BLAH;initial catalog=BLAH;integrated security=True;persist security info=True" />
<commandText value="INSERT INTO Logs ([Date],[Thread],[Source],[Level], [Logger],[Message],[Exception],[HostName]) VALUES (#log_date, #thread, 'LOG SOURCE',#log_level, #logger, #message, #exception, #hostname)" />
<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="#hostname" />
<dbType value="String" />
<size value="255" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%property{log4net:HostName}" />
</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="-1" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%message" />
</layout>
</parameter>
<parameter>
<parameterName value="#exception" />
<dbType value="String" />
<size value="-1" />
<layout type="log4net.Layout.ExceptionLayout" />
</parameter>
</appender>
<root>
<level value="ALL" />
<!-- Show logging in the Visual Studio output window-->
<appender-ref ref="TraceAppender" />
<appender-ref ref="AdoNetAppender" />
</root>
</log4net>
</configuration>
I have tested this config script and it works if I place it in my web.config file.
The log4netDebug.xml file has the Copy always property set.
When I try to do something like this:
System.IO.FileInfo fi = new System.IO.FileInfo("Log4NetDebug.xml");
log4net.Config.XmlConfigurator.ConfigureAndWatch(fi);
This doesn't work either.
I have read several stackoverflow and other web pages that describe how to do this and I seem to be doing what they recommend doing but it still deson't seem to work.
Any ideas why?

If you look at the Constructor for the FileInfo class, you will see that it expects The fully qualified name of the new file, or the relative file name..
So when you do this System.IO.FileInfo fi = new System.IO.FileInfo("Log4NetDebug.xml"); you need to specify the full path to the file.
As this is in a web app, you probably want something like this:
var logFile = new FileInfo(Path.Combine(HttpRuntime.BinDirectory, "Log4NetDebug.xml"));