log4j Tutorial - Log4j Log to Database

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We can use the log4j API to log information into database by using the org.apache.log4j.jdbc.JDBCAppender object.

The following table lists the configuration properties for JDBCAppender.

Example

First, create a table to store the log information.

CREATE TABLE LOGS
   (USER_ID VARCHAR(20) NOT NULL,
    DATED   DATE NOT NULL,
    LOGGER  VARCHAR(50) NOT NULL,
    LEVEL   VARCHAR(10) NOT NULL,
    MESSAGE VARCHAR(1000) NOT NULL
   );

Then, create the configuration file log4j.properties for JDBCAppender which controls how to connect to database and how to store log message to the LOGS table.

# Define the root logger with appender file
log4j.rootLogger = DEBUG, DB

# Define the DB appender
log4j.appender.DB=org.apache.log4j.jdbc.JDBCAppender

# Set JDBC URL
log4j.appender.DB.URL=jdbc:mysql://localhost/Your_Database_Name

# Set Database Driver
log4j.appender.DB.driver=com.mysql.jdbc.Driver

# Set database user name and password
log4j.appender.DB.user=your_user_name
log4j.appender.DB.password=your_password

# Set the SQL statement to be executed.
log4j.appender.DB.sql=INSERT INTO LOGS 
                      VALUES('%x','%d','%C','%p','%m')

# Define the layout for file appender
log4j.appender.DB.layout=org.apache.log4j.PatternLayout

The following code shows how to log information into a database.

import org.apache.log4j.Logger;
import java.sql.*;
import java.io.*;
import java.util.*;

public class Main{
  static Logger log = Logger.getLogger(Main.class.getName());

  public static void main(String[] args)
                throws IOException,SQLException{

     log.debug("Debug");
     log.info("Info");
  }
}

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