log4net在代码中配置SqLite
今天早些时候我问了一个关于从代码配置log4net的问题，并且很快就得到了答案，这使我可以将其配置为输出到文本文件。 从那以后我的需求发生了变化，我需要使用SqLite作为追加器。 所以我创建了以下类来允许这个：
public static class SqLiteAppender { public static IAppender GetSqliteAppender(string dbFilename) { var dbFile = new FileInfo(dbFilename); if (!dbFile.Exists) { CreateLogDb(dbFile); } var appender = new AdoNetAppender { ConnectionType = "System.Data.SQLite.SQLiteConnection, System.Data.SQLite", ConnectionString = String.Format("Data Source={0};Version=3;", dbFilename), CommandText = "INSERT INTO Log (Date, Level, Logger, Message) VALUES (@Date, @Level, @Logger, @Message)" }; appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@Date", DbType = DbType.DateTime, Layout = new log4net.Layout.RawTimeStampLayout() }); appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@Level", DbType = DbType.String, Layout = new log4net.Layout.RawPropertyLayout { Key = "Level" } }); appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@Logger", DbType = DbType.String, Layout = new log4net.Layout.RawPropertyLayout { Key = "LoggerName" } }); appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@Message", DbType = DbType.String, Layout = new log4net.Layout.RawPropertyLayout { Key = "RenderedMessage" } }); appender.BufferSize = 100; appender.ActivateOptions(); return appender; } public static void CreateLogDb(FileInfo file) { using (var conn = new SQLiteConnection()) { conn.ConnectionString = string.Format("Data Source={0};New=True;Compress=True;Synchronous=Off", file.FullName); conn.Open(); var cmd = conn.CreateCommand(); cmd.CommandText = @"CREATE TABLE Log( LogId INTEGER PRIMARY KEY, Date DATETIME NOT NULL, Level VARCHAR(50) NOT NULL, Logger VARCHAR(255) NOT NULL, Message TEXT DEFAULT NULL );"; cmd.ExecuteNonQuery(); cmd.Dispose(); conn.Close(); } } }
问题是虽然创建了数据库并添加了表，但我没有记录到这一点。
该类使用如下：
BasicConfigurator.Configure(SqLiteAppender.GetSqliteAppender(applicationContext.GetLogFile().FullName));
任何帮助指出我正确的方向将不胜感激。
谢谢
问题出在RawPropertyLayout实例中。 在我的测试中，他们没有像预期的那样提取Level和LoggerName属性，这导致数据库上出现空约束违规。 可以使用PatternLayout修复这些问题，如下所示：
Layout = new Layout2RawLayoutAdapter(new PatternLayout("%level"))
和
Layout = new Layout2RawLayoutAdapter(new PatternLayout("%logger"))
这是一个完整的工作示例：
using System; using System.Data; using System.Data.SQLite; using System.IO; using log4net; using log4net.Appender; using log4net.Config; using log4net.Layout; namespace ConsoleApplication1 { class SQLiteLogging { public static void Test() { BasicConfigurator.Configure(SqLiteAppender.GetSqliteAppender("D:/test.dat")); LogManager.GetLogger(typeof (SqLiteAppender)).Info("Hello there"); } public static class SqLiteAppender { public static IAppender GetSqliteAppender(string dbFilename) { var dbFile = new FileInfo(dbFilename); if (!dbFile.Exists) { CreateLogDb(dbFile); } var appender = new AdoNetAppender { ConnectionType = "System.Data.SQLite.SQLiteConnection, System.Data.SQLite", ConnectionString = String.Format("Data Source={0};Version=3;", dbFilename), CommandText = "INSERT INTO Log (Date, Level, Logger, Message) VALUES (@Date, @Level, @Logger, @Message)" }; appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@Date", DbType = DbType.DateTime, Layout = new RawTimeStampLayout() }); appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@Level", DbType = DbType.String, Layout = new Layout2RawLayoutAdapter(new PatternLayout("%level")) }); appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@Logger", DbType = DbType.String, Layout = new Layout2RawLayoutAdapter(new PatternLayout("%logger")) }); appender.AddParameter(new AdoNetAppenderParameter { ParameterName = "@Message", DbType = DbType.String, Layout = new RawPropertyLayout { Key = "RenderedMessage" } }); appender.ActivateOptions(); return appender; } public static void CreateLogDb(FileInfo file) { using (var conn = new SQLiteConnection()) { conn.ConnectionString = string.Format("Data Source={0};New=True;Compress=True;Synchronous=Off", file.FullName); conn.Open(); var cmd = conn.CreateCommand(); cmd.CommandText = @"CREATE TABLE Log( LogId INTEGER PRIMARY KEY, Date DATETIME NOT NULL, Level VARCHAR(50) NOT NULL, Logger VARCHAR(255) NOT NULL, Message TEXT DEFAULT NULL );"; cmd.ExecuteNonQuery(); cmd.Dispose(); conn.Close(); } } } } }
您是否尝试将缓冲区大小从100更改为1？
appender.BufferSize = 100;
至
appender.BufferSize = 1;
目前您的文件在输出任何消息之前等待100条消息。