https://github.com/nlog/NLog/wiki/Database-target

固定配置方式

<targets>
  <target name="table1" xsi:type="Database"
         ... />
  <target name="table2" xsi:type="Database"
         ... />
</targets>
<rules>
   <logger name="logger1" minlevel="Info" writeTo="table1" />
   <logger name="logger2" minlevel="Info" writeTo="table2" />
</rules>

程序动态方式

<target xsi:type="Database"
      name="db"
      commandText="insert into ${event-properties:tablename} ... ">

logger.Info().Message("this is a message").Property("tablename", "table1").Write();

存储过程方式

<target xsi:type="Database"
      name="db"
      commandText="proc " commandType="StoredProcedure ">