Question

I have a spring based webapp using Hibernate to query mysql. When I enable trace logging by using log4j.logger.org.hibernate.type=TRACE, all queries with their parameters are logged to the console. This makes the webapp slow for search queries.

I need to log only modifications to the database. Preferably the insert/update query issued to the mysql server. What is the simplest and most reliable way of doing this?

Can I just ask log4j to log only insert queries?

P6SPY seems overkill for my purpose.
http://sourceforge.net/projects/p6spy/

Answer 1

log4j 2 extended filter support. You may want to give the RegexFilter a try.

For log4j 1.2.x there’s StringMatchFilter which is part of the “extras” package.

Here is a quick example found online:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
  <appender name="CustomAppender" class="org.apache.log4j.RollingFileAppender">
    <param name="File" value="custom.log"/>
    <param name="Append" value="true"/>
    <param name="MaxFileSize" value="5000KB"/>
    <param name="maxBackupIndex" value="5"/> 
          <layout class="org.apache.log4j.PatternLayout">
                  <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} [%t] %-5p - %m%n" />
          </layout>

          <filter class="org.apache.log4j.varia.StringMatchFilter">
                  <param name="StringToMatch" value="Here is DEBUG" />
                  <param name="AcceptOnMatch" value="true" />
          </filter>
  </appender>

  <root>
    <appender-ref ref="CustomAppender"/>
  </root>
</log4j:configuration>

However, AFAIU it does not allow you to match wildcards which means dead end in your case I guess. If you dig into the filters source code it should be pretty easy to write your own.