如何在NET中使用SQLite和NLog

Question

我正在嘗試在NLog中使用SQLite，這樣我就可以將日誌記錄存儲到SQLite數據庫而不是平面文件。我遵循了一個很好的教程，但即使如此，我的代碼沒有啓用按預期工作。

我App.config文件：

<?xml version="1.0" encoding="utf-8"?> 
<configuration> 
    <connectionStrings> 
    <add name="SQLite" connectionString="Data Source=Log.db3;Version=3;" providerName="System.Data.SQLite" /> 
    </connectionStrings> 
    <startup> 
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" /> 
    </startup> 
    <system.data> 
    <DbProviderFactories> 
     <remove invariant="System.Data.SQLite" /> 
     <add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".Net Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" /> 
    </DbProviderFactories> 
    </system.data> 
</configuration> 

這是我NLog.config文件

<?xml version="1.0" encoding="utf-8" ?> 
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 
    <targets> 
    <target name="file" xsi:type="File" 
      layout="${longdate} ${logger} ${message}" 
      fileName="${basedir}/logs/${shortdate}/${level}.txt" 
      keepFileOpen="false"/> 
    <target name="db" xsi:type="Database" keepConnection="false" 
      useTransactions="false" 
      dbProvider="System.Data.SQLite" 
      connectionString="Data Source=${basedir}\Log.db3;Version=3;" 
      commandText="INSERT into Log(Timestamp, Loglevel, Callsite, Message) values(@Timestamp, @Loglevel, @Callsite, @Message)"> 
     <parameter name="@Timestamp" layout="${longdate}"/> 
     <parameter name="@Loglevel" layout="${level:uppercase=true}"/> 
     <parameter name="@Callsite" layout="${callsite:filename=true}"/> 
     <parameter name="@Message" layout="${message}"/> 
    </target> 
    </targets> 
    <rules> 
    <logger name="*" minlevel="Trace" writeTo="db" /> 
    </rules> 
</nlog> 

這是我的代碼：

static class Program 
    { 
     static Logger log = LogManager.GetCurrentClassLogger(); 
     /// <summary> 
     /// The main entry point for the application. 
     /// </summary> 
     [STAThread] 
     static void Main() 
     { 
      try 
      { 
       Application.EnableVisualStyles(); 
       Application.SetCompatibleTextRenderingDefault(false); 
       EnsureDb(); 
       log.Info("Logging like a boss"); 
       Application.Run(new Form1()); 
      } 
      catch (Exception ex) 
      { 
       throw; 
      } 

     } 

     private static void EnsureDb() 
     { 
      if (File.Exists("Log.db3")) 
       return; 

      using (SQLiteConnection connection = new SQLiteConnection(ConfigurationManager.ConnectionStrings["SQLite"].ToString())) 
      using (SQLiteCommand command = new SQLiteCommand(
       "CREATE TABLE Log (Timestamp TEXT, Loglevel TEXT, Callsite TEXT, Message TEXT)", 
       connection)) 
      { 
       connection.Open(); 
       command.ExecuteNonQuery(); 
      } 
     } 
    } 

我抄這個代碼從互聯網上，但不幸的是它不工作。 log.db3文件總是被創建，但沒有日誌條目到達日誌表。我怎樣才能解決這個問題？

Answer 1

對於.NET核心2.0我必須使用：

dbProvider="Microsoft.Data.Sqlite.SqliteConnection, Microsoft.Data.Sqlite" 

Answer 2

嘗試增加命令類型Text：

<target name="db" xsi:type="Database" 
     keepConnection="false" 
     useTransactions="false" 
     dbProvider="System.Data.SQLite" 
     connectionString="Data Source=${basedir}\Log.db3;Version=3;" 
     commandType="Text" 
     commandText="INSERT into Log(Timestamp, Loglevel, Callsite, Message) values(@Timestamp, @Loglevel, @Callsite, @Message)"> 

還用於調試目的考慮您的Main使用LogManager.ThrowExceptions = true; - 它可能給的什麼是錯的一些方向。它被扔NotSupportedException這給了我一個關於CommandType提示：

Unhandled Exception: NLog.NLogRuntimeException: Exception occurred in NLog ---> 
System.NotSupportedException: Specified method is not supported. 
    at System.Data.SQLite.SQLiteCommand.set_CommandType(CommandType value)