PHP DB Check


<?php
$dsn = 'mysql:host=localhost;dbname=cake';
$username = 'root';
$password = '';
$options = array(
    PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',
); 

$dbh = new PDO($dsn, $username, $password, $options);
?>

Load property file on changes

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.configuration.reloading.FileChangedReloadingStrategy;


public class ReadConfig {

private static PropertiesConfiguration config =  new PropertiesConfiguration();
public static synchronized String getProperty(final String key) {

                        config.setPath("<path of property file>");
config.setReloadingStrategy(new FileChangedReloadingStrategy());
config.load();
return (String) config.getProperty(key);
}


}

Basic Log4j Configuration using xml:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j=

              "http://jakarta.apache.org/log4j/"

               debug="false">

   <appender name="consoleAppender"

      class="org.apache.log4j.ConsoleAppender">

      <param name="Threshold" value="ALL" />

      <layout class="org.apache.log4j.PatternLayout">

         <param name="ConversionPattern" value="%d

             %-5p  [%c{1}] %m %n" />

      </layout>

   </appender>

   <appender name="fileAppender"

           class="org.apache.log4j.RollingFileAppender">

      <param name="Threshold" value="ALL" />

      <param name="File" value="D:/logs/jmsLogger.log"/>

      <param name="maxBackupIndex" value="20"/>

      <param name="maxFileSize" value="52428800"/>

      <layout class="org.apache.log4j.PatternLayout">

         <param name="ConversionPattern" value="%d

                %-5p  [%c{1}] %m %n" />

      </layout>

   </appender>

   <logger name="com.comfort" additivity="false" >

      <level value="ALL" />

      <appender-ref ref="consoleAppender"/>

      <appender-ref ref="fileAppender"/>

   </logger>

</log4j:configuration>

What is iterator

Iterator in Java is nothing but a traversing object, made specifically for Collection objects like List and Set. we have already aware about different kind of traversing methods like for-loop ,while loop,do-while,for each lop etc,they all are  index based traversing but as we know Java is purely object oriented language there is always possible ways of doing things using objects so Iterator is a way to traverse as well as access the data from the collection. Even with traversing with object we have Enumeration, Iterator and ListIterator in Java which we will in this Java Iterator tutorial.