title: What are the format characters using in log4j and explain their usage and give me some example?
body: <p>I have the below entry in the log4j config xml. What is the significant of '%p', '%C;%L', '%m'.  What is stands for those characters? What other characters, we can use in log4j? Explain their usage..</p>
  
  <pre><code>&lt;layout class="org.apache.log4j.PatternLayout"&gt;
  &lt;param name="ConversionPattern" 
  value="INSERT INTO LOGS (user_id, dated, msg_level, class, message) 
         VALUES ( '%X{MESSAGE_ID}','%d{ISO8601}','%p', '%C;%L', '%m' )" /&gt;
  &lt;/layout&gt;
  </code></pre>