iBATIS - Debugging

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It is easy to debug your program while working with iBATIS. iBATIS has built-in logging support and it works with the following logging libraries and searches for them in this order.

  • Jakarta Commons Logging (JCL).

  • Log4J

  • JDK logging

You can use any of the above listed libraries alongwith iBATIS.

Debugging with Log4J:

Assuming you are going to use Log4J, which is my favorite for logging. Before proceeding you need to cross check following points:

  • The Log4J JAR file (log4j-{version}.jar) should be in the CLASSPATH.

  • You have log4j.properties available in the CLASSPATH.

Following is the of a log4j.properties file. Note that some of the lines are commented out. You can uncomment them if you need additiona debugging information.

# Global logging configuration
log4j.rootLogger=ERROR, stdout

log4j.logger.com.ibatis=DEBUG

# shows SQL of prepared statements
#log4j.logger.java.sql.Connection=DEBUG

# shows parameters inserted into prepared statements
#log4j.logger.java.sql.PreparedStatement=DEBUG

# shows query results
#log4j.logger.java.sql.ResultSet=DEBUG

#log4j.logger.java.sql.Statement=DEBUG

# Console output
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

You can find complete documentation for Log4J from Apaches site: Log4J Documentation.

iBATIS Debugging Example:

The following Java class is a very simple example that initializes, and then uses, the Log4J logging library for Java applications. We would use above mentioned property file which lies in CLASSPATH.

import org.apache.log4j.Logger;

import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
import java.io.*;
import java.sql.SQLException;
import java.util.*;

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

  public static void main(String[] args)
   throws IOException,SQLException{
   Reader rd = Resources.getResourceAsReader("SqlMapConfig.xml");
   SqlMapClient smc = SqlMapClientBuilder.buildSqlMapClient(rd);

   /* This would insert one record in Employee table. */
   log.info("Going to update record.....");
   Employee rec = new Employee();
   rec.setId(1);
   rec.setFirstName( "Roma");
   smc.update("Employee.update", rec );
   log.info("Record updated Successfully ");

   log.debug("Going to read records.....");
   List <Employee> ems = (List<Employee>)
                        smc.queryForList("Employee.getAll", null);
   Employee em = null;
   for (Employee e : ems) {
      System.out.print("  " + e.getId());
      System.out.print("  " + e.getFirstName());
      System.out.print("  " + e.getLastName());
      System.out.print("  " + e.getSalary());
      em = e;
      System.out.println("");
   }

   log.debug("Records Read Successfully ");

  }
}

Compilation and Run:

Here are the steps to compile and run the above mentioned software. Make sure you have set PATH and CLASSPATH appropriately before proceeding for the compilation and execution.

  • Create Employee.xml as shown above.

  • Create Employee.java as shown above and compile it.

  • Create IbatisUpdate.java as shown above and compile it.

  • Create log4j.properties as shown above.

  • Execute IbatisUpdate binary to run the program.

You would get following result, and a record would be updated in EMPLOYEE table and later same record would be read from the EMPLOYEE table.

DEBUG [main] - Created connection 28405330.
DEBUG [main] - Returned connection 28405330 to pool.
DEBUG [main] - Checked out connection 28405330 from pool.
DEBUG [main] - Returned connection 28405330 to pool.
  1  Roma  Ali  5000
  2  Zara  Ali  5000
  3  Zara  Ali  5000

Debug Methods:

In the above example we used only info() method but you can use any of the following methods as per your requirements:

public void trace(Object message);
public void debug(Object message);
public void info(Object message);
public void warn(Object message);
public void error(Object message);
public void fatal(Object message);


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