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how to add sql query to log4j file

how to add sql query to log4j file.. am using oracle 10g simple jdbc application..(i.e register,login information,etc in queries..to logfie )
# Log levels
log4j.rootLogger=INFO,CONSOLE,R
# Appender Configuration
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
# Pattern to output the caller's file name and line number
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n
# Rolling File Appender
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.DatePattern='.'DD-MM-YYYY
# Path and file name to store the log file E:/logs
log4j.appender.R.File=D:\\log4j\\log\\my4.txt
log4j.appender.R.MaxFileSize=200KB
# Number of backup files
log4j.appender.R.MaxBackupIndex=2
# Layout for Rolling File Appender
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d - %c - %p - %m%n
log4j.appender.R.layout.ConversionPattern=%d{DD-MM-YYYY HH:mm} %c %M (%F:%L)-%m%n

Understanding Logging in hadoop

log4j.rootLogger=${hadoop.root.logger}
log4j.appender.RFA=org.apache.log4j.RollingFileAppender
log4j.appender.RFA.layout=org.apache.log4j.PatternLayout
log4j.appender.RFA.layout.ConversionPattern=%d{ISO8601} [%t] %-6p %c{2} %M - %m%n
log4j.appender.RFA.File=${hadoop.log.dir}/${hadoop.log.file}
I see the following properties set in my application log properties. What does ${hadoop.log.dir}/${hadoop.log.file} mean? How will I come up with the log files destination looking aat these properties?

I think you can
echo ${hadoop.log.dir} or echo ${hadoop.log.file} to see the path of the directory.

log4j appender with a file url

I have a problem where log4j is not logging to one of my files and i'm not sure why. I have some code that runs scripts, the scripts can add logging which is logged to a file using log4j, I am trying to create an appender that only logs for a particular script.
log4j.logger.com.my.class=INFO, JS_LOG
log4j.appender.JS_LOG.layout=org.apache.log4j.PatternLayout
log4j.appender.JS_LOG.Encoding=UTF-8
log4j.appender.JS_LOG.File=${log.outputdir}/js_service.log
log4j.appender.JS_LOG.MaxFileSize=2MB
log4j.appender.JS_LOG.MaxBackupIndex=10
log4j.appender.JS_LOG.Append=true
log4j.appender.JS_LOG=org.apache.log4j.RollingFileAppender
log4j.appender.JS_LOG.layout.ConversionPattern=%d [%t] %-5p %c %x - %m%n
the above appender works and i get this in my log file
2012-04-18 11:25:52,043 [<MD> Inc Msg Dispatch-1 New] INFO com.my.class.file:/myfile - info
when the script logs something it logs to a logger of the form
com.my.class.file:/myfile this appears in the log using the above config in my log4j.properties file.
if I change the above to:
log4j.logger.com.my.class.file:/myfile=INFO, JS_LOG
log4j.appender.JS_LOG.layout=org.apache.log4j.PatternLayout
log4j.appender.JS_LOG.Encoding=UTF-8
log4j.appender.JS_LOG.File=${log.outputdir}/js_service.log
log4j.appender.JS_LOG.MaxFileSize=2MB
log4j.appender.JS_LOG.MaxBackupIndex=10
log4j.appender.JS_LOG.Append=true
log4j.appender.JS_LOG=org.apache.log4j.RollingFileAppender
log4j.appender.JS_LOG.layout.ConversionPattern=%d [%t] %-5p %c %x - %m%n
nothing is logged to the file. I would have thought this should work? I retrieve the file

I managed to solve this problem, its something to do with the file: in my log4j.properties I changed the appender to file_ then in my code I do some manipulation to the file url to make it match the appender.

create log4j depending on level using .properties file

I have to create new file for each level like:
fatel.log for only FATAL
error.log for only ERROR
warn.log for only WARN etc.
how can i achieve this thing in changing this properties file.
Here is my log4j.properties file:
FILE
# level : OFF,FATAL,ERROR,WARN,INFO,DEBUG,ALL
log4j.rootLogger=DEBUG,CONSOLE,A1
log4j.addivity.org.apache=true
# for console
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Threshold=INFO
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.Encoding=UTF-8
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[INFO] %d - %c -%-4r [%t] %-5p %c %x - %m%n
# A1
log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender
log4j.appender.A1.File=C:/hibernateSqlite.log
log4j.appender.A1.Encoding=UTF-8
log4j.appender.A1.Threshold=DEBUG
log4j.appender.A1.DatePattern='.'yyyy-MM-dd
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L : %m%n

Though I've never done it, I guess it will be something like:
log4j.appender.AppDebug.filter.DebugFilter=org.apache.log4j.varia.LevelMatchFilter
log4j.appender.AppDebug.filter.DebugFilter.acceptOnMatch=true
log4j.appender.AppDebug.filter.DebugFilter.levelToMatch=DEBUG
The type of the AppDebug appender could be DailyRollingFileAppender, as in your case, with the remaining configuration options along.

How to keep single file and overwrite the contents in the same file using log4cxx?

In my application , Multiple threads log the data in the same file .if the file size exceeds the limit , then i have to delete the particular record in file and move every contents upwards.
can I do this in Log4cxx?if so ,reply your thoughts..
Thanks..

This sample will solve your problem :
log4j.rootLogger=debug, stdout, R
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=example.log
log4j.appender.R.MaxFileSize=100KB
# Keep one backup file
log4j.appender.R.MaxBackupIndex = 0
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n
This will override the file contents in the same file.