sudo ntpdate pool.ntp.org

After running this command you would get a response similar to the following:

21 Aug 04:08:20 ntpdate[4824]: adjust time server 209.167.68.100 offset 0.017300 sec

public class City {
	private String name;
	private List<PhoneNumber> phoneNumbers;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public List<PhoneNumber> getPhoneNumbers() {
		return phoneNumbers;
	}

	public void setPhoneNumbers(List<PhoneNumber> phoneNumbers) {
		this.phoneNumbers = phoneNumbers;
	}
}

So every city can have many phone numbers. Inside the PhoneNumber class we have

public class PhoneNumber {

	private String prefix;
	private double rate;

	public String getPrefix() {
		return prefix;
	}

	public void setPrefix(String prefix) {
		this.prefix = prefix;
	}

	public double getRate() {
		return rate;
	}

	public void setRate(double rate) {
		this.rate = rate;
	}

}

lets assume that we have an action that returns a list of all cities available. Something like the following:

public class AllRatesAction extends ActionSupport {
	private static final long serialVersionUID = 1L;
	private List<City> allCities;

	//This is the List of cities passed to the JSP page
	public List<City> getAllCities() {
		return allCities;
	}

	public void setAllCities(List<City> allCities) {
		this.allCities = allCities;
	}

	public String execute() {
		//the content of what is happening inside getAllCallRates
		// is not related to this tutrial
		setAllCities(CallRatesDS.getAllCallRates());
		return SUCCESS;
	}

}

The following is how the iterator tags should be used to access the list of City objects and how to access the list of phone numbers inside every city. As you can see we basically create an object of every list and access them through the newly created objects.

<table>
<s:iterator value="allCities" id="cities">
	<s:iterator value="#city.phoneNumbers" id="number">
	<tr>
		<td>
		<!-- Accessing the city name through the city variable -->
			<s:property value="#city.name" />
		</td>
		<td>
			<!-- Accessing the objects inside the phone number object through the number variable -->
			<s:property value="#number.prefix" />
		</td>
		<td>
			<s:property value="#number.rate" />
		</td>
	</tr>
	</s:iterator>
</s:iterator>
</table>

The libraries you need to download are available at: http://www.jasypt.org/
The following sample code encrypts and decrypts a String. Please not that I have created an object of BasicTextEncryptor twice the reason for that is to show that you would need to set the correct password used in the encryption process to decrypt the plain-text message.

import org.jasypt.util.text.BasicTextEncryptor;

public class Secret {

	public static void main(String[] args) {

		String userPassword="PassWord";
		String message = "Some text which is to be encrypted by the user password. Later it is decrypted to the original plain-text using the same password.";

		//Encrypt
		BasicTextEncryptor textEncryptor = new BasicTextEncryptor();
		textEncryptor.setPassword(userPassword);
		String myEncryptedText = textEncryptor.encrypt(message);
		System.out.println("Encrypted text:\n"+myEncryptedText);

		//Decrypt
		BasicTextEncryptor textDecryptor = new BasicTextEncryptor();
		textDecryptor.setPassword(userPassword);
		String plainText = textDecryptor.decrypt(myEncryptedText);

		System.out.println("Decrypted text:\n"+plainText);
	}

}

-- First: you need to declare a variable to hold the long CLOB value.
declare
clobVariable varchar2(32767) :='YOUR LONG CLOB VALUE GOES HERE';

begin
-- ALL the queries you need to run as to be inside the begin tag.
-- As you can see I'm using the variable 'clobVariable' in the insert statement to insert into the table.
-- You can use this variable in any combination of SQL statements.

insert into sometbale(id,clob_column) values(1,clobVariable);
end;
/

sudo vi /etc/hostname

This file contains your existing computer name. You can change it to anything you like.
The next step is to modify the hosts file:

sudo vi /etc/hosts

Inside this file look for the entry starting with:
127.0.1.1
You would need to change the name in this line to whatever you change to in the first file name.
If you don’t do the second step your computer name would still be changed but you would get the error message “unable to resolve host” everything you login to your account.

lets assume we are interested in inserting a row with the following values only if it doesn’t exist in the database table:
name: Pourya
family: Shahroudi
email: something@something.com

INSERT INTO USERS(name,family,email)
SELECT 'Pourya', 'Shahroudi','something@something.com' FROM USERS
WHERE NOT EXISTS(
    SELECT name,family,emial FROM USERS
    WHERE name='Pourya'
    AND family='Shahroudi' and email='something@something.com'
) and ROWNUM = 1;

As you can see this query does a SELECT on the database table with the values we want to insert if this row doesn’t exist then they are inserted into the database table.
NOTE: “ROWNUM = 1” is extremely important in this query if you don’t have this included the query will try to insert as many records as you currently have in the table into the table.

:%s/^M//g

‘^M’ is CONTROL-V. Once you enter it will search your document and it removes all instances of ^M character from the file.

To change the color scheme in vi just do:

colorscheme torte

which changes your color shema to torte. To see the available color schemes you could use key.

To change the font in vi editor you would have to do:

set guifont=Lucida\ Console:h10

Please note that ‘\’ is being used before every space character in the font name.
setting the line numbers:

set number

To highlight the search result in the current doument:

set hlsearch

To have this change made every time you start vi you would need to add it anywhere in vimrc file. In Linux its under /etc/vim/ and in windows its inside the installation folder in “program files”

sudo apt-get install pysdm