每日关键词-170228
聚集索引 非聚集索引
聚集索引会产生物理排序,而非聚集索引不会,如果经常需要某个字段进行查询,可以建立非聚集索引
log4net:nuget log4net包之后
配置xml
代码如下:
<?xml version="1.0" encoding="utf-8"?> <log4net> <!-- Define some output appenders --> <appender name="rollingAppender" type="log4net.Appender.RollingFileAppender"> <file value="log\log.txt" /> <!--追加日志内容--> <appendToFile value="true" /> <!--防止多线程时不能写Log,官方说线程非安全--> <lockingModel type="log4net.Appender.FileAppender+MinimalLock" /> <!--可以为:Once|Size|Date|Composite--> <!--Composite为Size和Date的组合--> <rollingStyle value="Composite" /> <!--当备份文件时,为文件名加的后缀--> <datePattern value="yyyyMMdd.TXT" /> <!--日志最大个数,都是最新的--> <!--rollingStyle节点为Size时,只能有value个日志--> <!--rollingStyle节点为Composite时,每天有value个日志--> <maxSizeRollBackups value="20" /> <!--可用的单位:KB|MB|GB--> <maximumFileSize value="3MB" /> <!--置为true,当前最新日志文件名永远为file节中的名字--> <staticLogFileName value="true" /> <!--输出级别在INFO和ERROR之间的日志--> <filter type="log4net.Filter.LevelRangeFilter"> <param name="LevelMin" value="INFO" /> <param name="LevelMax" value="FATAL" /> </filter> <!--必须结合起来用,第一个只过滤出WARN,第二个拒绝其它其它日志输出--> <!-- <filter type="log4net.Filter.LevelMatchFilter"> <param name="LevelToMatch" value="WARN" /> </filter> <filter type="log4net.Filter.DenyAllFilter" />--> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/> </layout> </appender> <!--nhiberate和nhiberateSQL日志--> <!--<appender name="nhibernateAppender" type="log4net.Appender.RollingFileAppender"> <file value="log\nhiberate.txt"/> <appendToFile value="true"/> <maximumFileSize value="100KB"/> <rollingStyle value="Size"/> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%d{HH:mm:ss} [%t] %-5p %c - %m%n"/> </layout> </appender> <appender name="nhibernateSQLAppender" type="log4net.Appender.RollingFileAppender"> <file value="log\nhibernateSQL.txt"/> <appendToFile value="true" /> <rollingStyle value="Composite" /> <datePattern value="yyyyMMdd" /> <maxSizeRollBackups value="10" /> <maximumFileSize value="1MB" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%d{HH:mm:ss} [%t] %-5p %c - %m%n"/> </layout> </appender>--> <!-- levels: OFF > FATAL > ERROR > WARN > INFO > DEBUG > ALL --> <root> <priority value="ALL"/> <level value="ALL"/> <appender-ref ref="rollingAppender" /> </root> <logger name="NHibernate" > <level value="ERROR"/> <appender-ref ref="nhibernateAppender"/> </logger> <logger name="NHibernate.SQL"> <level value="DEBUG"/> <appender-ref ref="nhibernateSQLAppender" /> <appender-ref ref="trace" /> </logger> </log4net>
自己copy用,最后调用log4net ,举例一个简单的log4的cs
using System; using System.IO; using System.Diagnostics; using System.Configuration; using log4net.Config; using log4net; namespace log4Net { public class Logger { static Logger() { XmlConfigurator.Configure(new FileInfo(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "CfgFiles\\log4net.cfg.xml"))); ILog Log = LogManager.GetLogger(typeof(Logger)); Log.Info("系统初始化Logger模块"); } private ILog loger = null; public Logger(Type type) { loger = LogManager.GetLogger(type); } /// <summary> /// Log4日志 /// </summary> /// <param name="msg"></param> /// <param name="ex"></param> public void Error(string msg = "出现异常", Exception ex = null) { loger.Error(msg, ex); } } }
追加一下: 需要将xml文件右键属性设置成 总是复制!