Silicon Magic: 2009

ORA-14552: cannot perform a DDL, commit or rollback inside a query or DML

Cause:
=====
DML operations like create, drop etc. and rollback/commit can not be performed in a SQL statement

Example:
=======
The most general case where this error occurs is calling a function as
SELECT myFunc(.. .. ..) FROM dual..
Something like this or the like, Where myFunc contains DML operations, rollback or commit statements.

Solution:
==========
You have to ensure that DML operations and rollback/commit operations must be autonomous instead of inside a query.

For the case described above you can execute the function myFunc as
var:=myFunc(.. .. ..);

Or redefine the function as
CREATE OR REPLACE function myFunc(.. .. ..) RETURN ..
AS
....
....
PRAGMA AUTONOMOUS_TRANSACTION
begin
.....
.....
.....
end;

Java By Example: Java Calendar day, month, week, year, hour getting, java.util.Calendar

Java provides a strong way to work with date and calendar. Here is an example of java calendar to get values of --

* Month

* Year

* Week of year

* Week of month

* Day of month

* Hour

etc...

In this way we can also get some other information from calendar, like

* day of year

* Hour of day

* Minutes

* Seconds

* Time Zone

etc ..

import java.util.Calendar;

publicclass JavaCalendar {

publicstaticvoid main(String args[]){

Calendar calendar = Calendar.getInstance();

/* Setting calendar for current time */

calendar.setTimeInMillis(System.currentTimeMillis());

/* Get calendar month */

System.out.println(calendar.get(Calendar.MONTH)+1);

/* Get calendar year */

System.out.println(calendar.get(Calendar.YEAR

/* Get calendar week of year */

System.out.println(calendar.get(Calendar.WEEK_OF_YEAR

/* Get calendar week of month */

System.out.println(calendar.get(Calendar.WEEK_OF_MONTH

/* Get calendar day of week */

System.out.println(calendar.get(Calendar.DAY_OF_WEEK

/* Get calendar day of the month */

System.out.println(calendar.get(Calendar.DAY_OF_MONTH

/* Get calendar Hour */

System.out.println(calendar.get(Calendar.HOUR

}

Java By Example: Java Menue Example [ javax.swing.JMenu ]

Here is a very basic example of Java Menu[JMenue]

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

public class Menu extends JFrame{
public Menu()
{
super("Menu example");

JMenu file = new JMenu("File");
file.setMnemonic(’F’);
JMenuItem newItem = new JMenuItem("New");
newItem.setMnemonic(’N’);
file.add(newItem);
JMenuItem openItem = new JMenuItem("Open");
openItem.setMnemonic(’O’);
file.add(openItem);
JMenuItem exitItem = new JMenuItem("Exit");
exitItem.setMnemonic(’x’);
file.add(exitItem);

//adding action listener to menu items
newItem.addActionListener(
new ActionListener() {

public void actionPerformed(ActionEvent e)
{
System.out.println("New is pressed");
}
}
);
openItem.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e)
{
System.out.println("Open is pressed");
}
}
);
exitItem.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e)
{
System.out.println("Exit is pressed");
}
}
);
JMenuBar bar = new JMenuBar();
setJMenuBar(bar);
bar.add(file);

getContentPane();
setSize(400, 400);
setVisible(true);
}

public static void main(String[] args)
{
Menu app = new Menu();
app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

Java Vector to array or List to array

We can easily get an array from Vector or List by just calling toArray() methods. This will generate arrays of Objects. Here is an example of getting array of Strings from java.util.Vector and java.util.List. I hope this will be helpful to you..

Vector friends = new Vector();
friends.add("Tuhin");
friends.add("Sumon");
friends.add("Habib");
friends.add("Shishir");
friends.add("Kiser");
friends.add("Zimi");
friends.add("Lizzie");

String arr[] = (String[]) friends.toArray(new String[0]);
System.out.println(Arrays.toString(arr));

List friendsList = new ArrayList();
friendsList.add("Tuhin");
friendsList.add("Sumon");
friendsList.add("Habib");
friendsList.add("Shishir");
friendsList.add("Kiser");
friendsList.add("Zimi");
friendsList.add("Lizzie");
arr = (String[]) friendsList.toArray(new String[0]);
System.out.println(Arrays.toString(arr));

If you execute the above code block. This will generate an output as follows..

[Tuhin, Sumon, Habib, Shishir, Kiser, Zimi, Lizzie]
[Tuhin, Sumon, Habib, Shishir, Kiser, Zimi, Lizzie]

Java Sorting Array, List

Java provides an interface java.util.Collections which provides way to sort List, Arraylist etc. We can sort an array of String by first transforming it to a List first then applying Collection.sort() method then again transforming from List to String array. Here is a practical example of this. Hope this will be helpful to you.

String friends[] = {"Tuhin", "Sumon","Habib","Shishir","Kiser","Zimi","Lizzie"};
System.out.println(Arrays.toString(friends));
List tempList = Arrays.asList(friends);
System.out.println(tempList);
Collections.sort(tempList);
System.out.println(tempList);
friends = (String[]) tempList.toArray(new String[0]);
System.out.println(Arrays.toString(friends));

This code block if execute will generate output like ...

[Tuhin, Sumon, Habib, Shishir, Kiser, Zimi, Lizzie]
[Tuhin, Sumon, Habib, Shishir, Kiser, Zimi, Lizzie]
[Habib, Kiser, Lizzie, Shishir, Sumon, Tuhin, Zimi]
[Habib, Kiser, Lizzie, Shishir, Sumon, Tuhin, Zimi]

ORACLE: Getting maximum sub string

We can easily find the maximum sub-string from a table of oracle. Let's see the following example..

CREATE table test(
name varchar2(100),
code varchar2(50)
)
INSERT INTO test(name,code) VALUES('Bangladesh','880');
INSERT INTO test(name,code) VALUES('BGD-Mobile','8801');
INSERT INTO test(name,code) VALUES('BGD-GP','88017');
INSERT INTO test(name,code) VALUES('BGD-AKTEL','88018');
INSERT INTO test(name,code) VALUES('BGD-Bangla Link','88019');
INSERT INTO test(name,code) VALUES('BGD-CITYCELL','88011');
INSERT INTO test(name,code) VALUES('BGD-WARID','88016');
INSERT INTO test(name,code) VALUES('BGD-TELETALK','88015');

SELECT * FROM test

SELECT max(code) FROM test WHERE instr('8801234',code)>0;

This will give: 8801

SELECT max(code) FROM test WHERE instr('880234',code)>0;

This will give: 880

SELECT max(code) FROM test WHERE instr('8801123',code)>0;

This will give: 88011

ORA-01704: String literal too long

The Mail cause of this error is stating by the message itself 'String literal too long'. If you try to INSERT more than 4000 characters to a varchar2 field this error will occur. Another case where this may occur is if you try to update a CLOB field. CLOB field doesn't support update.

In Java if you try to execute PreparedStatement.executeUpdate() to INSERT or UPDATE CLOB field of ORACLE with more than 4000 characters, you'll get this error.

To avoid this use PreparedStatement.execute() methode to to INSERT CLOB field.

This may occur in other language also. And you can use same technique to avoid errors.

Happy programming.

Comment my blog/ email me for any problems related to this.

Java by Example: Exception Handling, creating custom exception class

You can easily create your own Exception Class where you can put your own exception. To do this what you have to do is just you have create an subclass of java.lang.Exception class.

Here is a basic example of creating custom exception class

package example.java.lang;

public
class
ExceptionExp5
extends Exception{

public ExceptionExp5() {

super("[ MY EXCEPTION ] ");

}

public ExceptionExp5(String exceptionString) {

super("[ MY EXCEPTION ] "+exceptionString);

}

public
static
void main(String args[]){

try{

new
ExceptionExp5().tryCustomException();

}catch(Exception e){

e.printStackTrace();

}

public
void tryCustomException() throws Exception{

int fibs[]={1,2,3,5,8,10,13};

for(int i=0;i<fibs.length;i++){

if(isFibs(fibs[i]))

System.out.println(fibs[i]+" - OK");

else

throw
new
ExceptionExp5("Invalid fibonacci number "+fibs[i]);

}

private
boolean isFibs(int num){

int f0 = 1;

int f1 = 1;

int fib = 1;

while(num>=fib){

if(num==fib)

return
true;

fib = f0 + f1;

f0 = f1;

f1 = fib;

}

return
false;

}

If you execute this you'll get output like..

1 - OK

2 - OK

3 - OK

5 - OK

8 - OK

example.java.lang.ExceptionExp5: [ MY EXCEPTION ] Invalid fibonacci number 10

at example.java.lang.ExceptionExp5.tryCustomException(ExceptionExp5.java:23)

at example.java.lang.ExceptionExp5.main(ExceptionExp5.java:12)

Java by Example: Exception handling – throw custom Exception

Exception indicates illegal operation. So for your program you can define an operation as illegal. Say in your login program you allow maxim 3 times retry with wrong user/password. Then you can define your exception for attempt to login for more than thrice. And if this case occurs you can throw your exception.

Here is an example of throw custom exception to check if a number is a Fibonacci number or not. When a non Fibonacci number found exception 'Invalid fibonacci number' will be thrown..

Here is the example . .

public
class ExceptionExp4 {

public
static
void main(String args[]){

ExceptionExp4 excpExp = new ExceptionExp4();

try{

excpExp.tryCustomException();

}catch(Exception ce){

ce.printStackTrace();

}

public
void tryCustomException() throws Exception{

int fibs[]={1,2,3,5,8,10,13};

for(int i=0;i<fibs.length;i++){

if(isFibs(fibs[i]))

System.out.println(fibs[i]+" - OK");

else

throw
new Exception("Invalid fibonacci number "+fibs[i]);

}

private
boolean isFibs(int num){

int f0 = 1;

int f1 = 1;

int fib = 1;

while(num>=fib){

if(num==fib)

return
true;

fib = f0 + f1;

f0 = f1;

f1 = fib;

}

return
false;

}

Fibonacci number series is

1 2 3 5 8 13 21 34 . . . .

So if you try to execute exception should occur when 10 is found..

Lets see the output of this program...

1 - OK

2 - OK

3 - OK

5 - OK

8 - OK

java.lang.Exception: Invalid fibonacci number 10

at example.java.lang.ExceptionExp4.tryCustomException(ExceptionExp4.java:18)

at example.java.lang.ExceptionExp4.main(ExceptionExp4.java:7)

So in this way we can easily create our own exception with our own message as per our needs.

Java By Example: Exception Handling – Throwing exception from method

The second way of exception handling is throwing the exception. This is done by adding throws with method name.

Syntax of throwing exception from method is

access_modifier return_type method_name(arguments) throws exception_list{

}

Here is a practical example of doing this..

public
class ExceptionExp3 {

public
static
void main(String args[]){

ExceptionExp3 excpExp = new ExceptionExp3();

try{

excpExp.tryThrows();

}catch(ArrayIndexOutOfBoundsException ae){

System.out.println("Exception Caught");

}

public
void tryThrows() throws ArrayIndexOutOfBoundsException{

String strArray[] = {"This","is", "an", "example", "of", "Java","exception" };

System.out.println(strArray[0]);

System.out.println(strArray[1]);

System.out.println(strArray[3]);

System.out.println(strArray[4]);

System.out.println(strArray[5]);

System.out.println(strArray[6]);

System.out.println(strArray[7]);

System.out.println("This statement wont execute");

}

The ArrayIndexOutOfBoundsException is thrown from method tryThrows() instead of handling the exception. In this case when exception occurred in tryThrows() method instead of terminating the program this method throw the exception to caller.

This program will give the following output..

This

example

Java

exception

Exception Caught

Java by Example: Exception handling – Basic Exception Handling example ‘try catch’

Exception Handling: The basic way to cope with exception is using try ...catch.

The Syntax for using try...catch is

try{

...

Code have to monitor for exception

...

}catch(Exception e){

...

Exception action code

...

}

Here is an easy example to demonstrate the above case..

public
class ExceptionExp2 {

public
static
void main(String args[]){

String strArray[] = {"This","is","an","example","of","Java","exception" };

try{

System.out.println(strArray[0]);

System.out.println(strArray[1]);

System.out.println(strArray[3]);

System.out.println(strArray[4]);

System.out.println(strArray[5]);

System.out.println(strArray[6]);

System.out.println(strArray[7]);

}catch(ArrayIndexOutOfBoundsException exp){

System.out.println("Exception Occurred");

}

System.out.println("This will execute");

}

If you run the above code it will give the following output …

This

example

Java

exception

Exception Occurred

This will execute

So exception is handled here by printing a message "Exception Occurred" and the program continues to execute the codes after the try ... catch block instead of terminating.

Java by Example: Exception Handling – Java Exception Basics

Java provides strong way to cope with Errors and Exceptions. When an illegal operation occurred Java throws exception. And When exception occurs program execution ends if exception is not handled properly. There is a class below to understand Java Exception..

public
class ExceptionExp1 {

public
static
void main(String args[]){

String strArray[] = {"This","is", "an", "example", "of", "Java","exception" };

System.out.println(strArray[0]);

System.out.println(strArray[1]);

System.out.println(strArray[3]);

System.out.println(strArray[4]);

System.out.println(strArray[5]);

System.out.println(strArray[6]);

System.out.println(strArray[7]);

System.out.println("Program will terminate before executing this line");

}

If you execute this program, the output will be-

This

example

Java

exception

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 7

at example.java.lang.ExceptionExp1.main(ExceptionExp1.java:13)

Here exception occurs before ends the program and terminates.

Oracle : Hierarchical Data/ Tree in Oracle

Oracle provides strong way to query tree like data or hierarchical data.

The syntax for query hierarchical data is-

SELECT columns

FROM table_name

WHERE where_condition

CONNECT BY PRIOR condition_for_next_level

START WITH start_condition

ORDER SIBLINGS BY columns

Let's try it with a practical example.

CREATE
TABLE location(

id NUMBER,

name
VARCHAR2(100),

parent NUMBER

);

INSERT
INTO location(id,name,parent) VALUES(1,'Earth',0);

INSERT
INTO location(id,name,parent) VALUES(2,'Asia',1);

INSERT
INTO location(id,name,parent) VALUES(3,'Europe',1);

INSERT
INTO location(id,name,parent) VALUES(4,'America',1);

INSERT
INTO location(id,name,parent) VALUES(5,'Africa',1);

INSERT
INTO location(id,name,parent) VALUES(6,'Oceania',1);

INSERT
INTO location(id,name,parent) VALUES(7,'Bangladesh',2);

INSERT
INTO location(id,name,parent) VALUES(8,'India',2);

INSERT
INTO location(id,name,parent) VALUES(9,'Pakistan',2);

INSERT
INTO location(id,name,parent) VALUES(10,'Singapore',2);

INSERT
INTO location(id,name,parent) VALUES(11,'Malaysia',2);

INSERT
INTO location(id,name,parent) VALUES(12,'England',3);

INSERT
INTO location(id,name,parent) VALUES(13,'France',3);

INSERT
INTO location(id,name,parent) VALUES(14,'Turkey',3);

INSERT
INTO location(id,name,parent) VALUES(15,'Scotland',3);

INSERT
INTO location(id,name,parent) VALUES(16,'Mexico',4);

INSERT
INTO location(id,name,parent) VALUES(17,'Canada',4);

INSERT
INTO location(id,name,parent) VALUES(18,'USA',4);

INSERT
INTO location(id,name,parent) VALUES(19,'Dhaka',7);

INSERT
INTO location(id,name,parent) VALUES(20,'Rajshahi',7);

INSERT
INTO location(id,name,parent) VALUES(21,'Chittagong',7);

INSERT
INTO location(id,name,parent) VALUES(22,'Las Vegas',18);

INSERT
INTO location(id,name,parent) VALUES(23,'New Orlince',18);

INSERT
INTO location(id,name,parent) VALUES(24,'New York',18);

Now

SELECT * FROM location;

Will give..

ID NAME PARENT

-----------------------------------------------

1 Earth 0

2 Asia 1

3 Europe 1

4 America 1

5 Africa 1

6 Oceania 1

7 Bangladesh 2

8 India 2

9 Pakistan 2

10 Singapore 2

11 Malaysia 2

12 England 3

13 France 3

14 Turkey 3

15 Scotland 3

16 Mexico 4

17 Canada 4

18 USA 4

19 Dhaka 7

20 Rajshahi 7

21 Chittagong 7

22 Las Vegas 18

23 New Orlince 18

24 New York 18

Now

SELECT
lpad(' ',8*(level-1))||NAME AS name
FROM LOCATION

CONNECT
BY
PRIOR id = parent

START
WITH parent = 0

Will give the following result

NAME

------------

Earth

Asia

Bangladesh

Dhaka

Rajshahi

Chittagong

India

Pakistan

Singapore

Malaysia

Europe

England

France

Turkey

Scotland

America

Mexico

Canada

USA

Las Vegas

New Orlince

New York

Africa

Oceania

You can also use ORDER SIBLINGS BY to sort siblings

ORACLE - ALTER TABLE: Rename Table

Syntax:

ALTER TABLE table_name
RENAME TO new_table_name;

Example:
ALTER TABLE emp
RENAME TO emp_records;

This will change the table name from 'emp' to emp_record.

Oracle : ALTER TABLE: Add Columns

Syntax:

ALTER
TABLE

table_name

ADD(

column1 datatype1 constraint1,

column2 datatype2 constraint2,

column3 datatype3 constraint3

);

ALTER
TABLE

emp

ADD(

designation VARCHAR2(100) UNIQUE,

rank NUMBER
NOT
NULL

);

This will add 2 columns to the table 'emp' named 'designation' and 'rank' with given constraints and data types

Java Difference between Hashtable and Hashmap / Hashtable versus Hashmap

Both Hashtable and Hashmap are Hashtable implementation of java classes. Hashtable is a basic class of java 'Collection Framework' and Hashmap is a Hashtable implementa from Map interface.
The majore differences are described below...

1. Synchronous/asynchronous: Hashtable is synchronous and Hashmap is not synchronous by default.

2. null value as key: Hashtable does not support null value as hash key but Hasmap support it.

3. Faile-safe: Iterator of Hashmap is fail-safe but Enumeration of Hashtable is not failsafe.

Perhaps this will be able to eliminate any misconception about Hashtable and Hashmap

Java Dangling meta character, PatternSyntaxException

PatternSyntaxException: Unmatched closing ')',

PatternSyntaxException: Unclosed group near,

PatternSyntaxException: Dangling meta character

The cause of the above Exceptions are you're trying to use meta character in Java Pattern processing, like regular expression.

The meta characters in this case are ([{\^-$|]})?*+

So if you want to process a String containing any of the meta characters in regular expression procession using java regex you'll get Exception like above. To process String containing a meta character just use escape character, a fore slash('/') before that character.

Any java method that use java regex also give such errors.

For example

Let's see the code below

String input = "I live in Dhaka(agargaon), Bangladesh";

String arr[] = input.split(")");

This will give the Exception PatternSyntaxException: Unmatched closing ')',

One more such method is indexOf().

In this case you have ti change the above code as

String arr[] = input.split("\\)");

Or for indexOf

input.indexOf("\\)");

Using cookie in Java servlet/ jsp

Cookie is often very important in web programming. Java servlet / jsp provide a easy way to work with browser cookie.

You can easily set cookie by the following way..
<%
String myName=request.getParameter("myName");
if(myName==null) myName="";
Date now = new Date();
String timestamp = now.toString();
Cookie cookie = new Cookie ("myName",myName);
cookie.setMaxAge(2 * 365 * 24 * 60 * 60);
response.addCookie(cookie);
%>
Here a cookie name 'myName' is created with value request.getParameter("myName"). The lifetime for this cookie is set to 2 years;

You you can fetch that cookie using jsp/servlet easily by the following way
<%
String cookieName = "myName";
Cookie allCookies [] = request.getCookies ();
Cookie cook = null;
if (allCookies != null)
{
for (int i = 0; i < allCookies.length; i++)
{
if (allCookies [i].getName().equals (cookieName))
{
cook = allCookies[i];
break;
}
}
}
%>

The Cookie object cook will contain the requested cookie. And you can get the value of the cookie by calling cook.getValue() methode.

Thank you.

Using Session in JSP

Session is very important in we programming. There are many use of session in web programming. Java servlet/ Jsp provide easy way to work with session.

See the following code...
<%
Vector users = new Vector();
users.add("ABC");
users.add("BCD");
users.add("CDE");
session.setAttribute("users", users);
%>

This will set the Vector object users to session with name users.

To get values from session we can do the following..
<%
Vector users = (Vector)getAttribute("users");
for(int i=0;i<users.size();i++)
out.print((String)users.get(i)+"<br >");
%>

In this way we can handle session in JSP/servlet.

For any query just add comment..

Using SVN

To use svn you need an svn client. You can download a good svn client from http://tortoisesvn.tigris.org/ you can also add an cvs client for eclipse named subclipse from the following eclipse update site

          Name: Subclipse 1.4.x (Eclipse 3.2+)
          URL:  http://subclipse.tigris.org/update_1.4.x


          Name: Subclipse 1.2.x (Eclipse 3.2+)
          URL:  http://subclipse.tigris.org/update_1.2.x


          Name: Subclipse 1.0.x (Eclipse 3.0/3.1)
          URL:  http://subclipse.tigris.org/update_1.0.x

To checkout and import a project from and to SVN use the following parameters..

url: svn://<hostname><repository> eg. svn://localhost/usr/svn/svnroot

If you use authenticated access instead of anonymous access you need user name and password eg. user1 and pass1

This post was published to Silicon Magic at 5:22:42 PM 3/28/2009

[Enter Post Title Here]

Create repository
Create a svn repository by the command
```
$ svnadmin create /usr/svn/svnroot
```

Edit for authentication

Edit [general] section of svnroot/conf/svnserve.conf file as

[general]

anon-access = write

This will allow anonymous user to checkout and commit svn server. To restrict access to user do the following

```
Edit the [general] section of svnserve.conf as
```
[general]
anon-access = none
auth-access = write
authz-db = authz
password-db = passwd
Edit the [/] section of authz file as
[/]
user1 = rw
user2 = r
* =

          c. Edit the [user] section of passwd file as

     [user]

     user1 = pass1

              user2 = pass2

Start SVN repository

Start/Initiate repository by the following command

$ svnserve -d -r /usr/svn/svnroot

SVN Installation (on Unix/Linux)

Prerequisites Installing
1. autoconf
2. libtool
3. a reasonable C compiler (gcc, Visual Studio, etc.
4. libapr
5. libapr-util
6. libz
7. libserf
8. OpenSSL
Install above prerequisites properly if your system missing any of the above list. If you have tarbal file(XXXX.tar.gz) install as

    $ tar xzvf XXXX.tar.gz

    $ cd XXXX

    $ ./configure

    $ make

      $ make install

Otherwise if you have rpm(YYYY.rpm) for the above listed prerequisites, install them by the command

$ rpm –i YYYY.rpm

SVN Installing
Down load SVN tarball file from http://subversion.tigris.org/getting.html#source-release
```
$ tar xzvf subversion-1.x.x.tar.gz
```
```
$ cd subversion-1.x.x
```
$ ./autogen
$ ./configure --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr
$ make
$ make install

Print a part of a webpage using javascript

We can easily print a part of a webpage by calling window.print() .

Here is an example to print a <div>

<html>

<head>

</head>

<body>

This is to print<br/>

Testing

</div>

This is not to print<br/>

Testing

</div>

<br/>

<span onClick="printIt();">Click here</span>

function printIt(){

user_pref("print.print_footercenter","");

user_pref("print.print_footerleft","");

user_pref("print.print_footerright","");

user_pref("print.print_headerleft","");

user_pref("print.print_headercenter","");

user_pref("print.print_headerright","");

wi = window.open('', 'p');

wi.document.open();

element=document.getElementById("myDiv");

wi.document.write(element.innerHTML);

wi.print();

wi.document.close();

wi.close();

}

</script>

</body>

</html>

Print a part of a webpage using javascript

We can easily print a part of a webpage by calling window.print() .

Here is an example to print a <div>

<html>

<head>

</head>

<body>

This is to print<br/>

Testing

</div>

This is not to print<br/>

Testing

</div>

<br/>

<span onClick="printIt();">Click here</span>

function printIt(){

wi = window.open('', 'p');

wi.document.open();

element=document.getElementById("myDiv");

wi.document.write(element.innerHTML);

wi.print();

wi.document.close();

wi.close();

}

</script>

</body>

</html>

Eclipse plug-in for android development

Eclipse is now a days popular IDE for software developers. Google provides a plug-in for eclipse to ease android development. Follow the following steps to add android plug-in into your eclipse IDE.

1. Click help from eclipse menue

2. Click on Software Updates...

3. A new window will come. Click on Add sites

4. Type http://dl-ssl.google.com/android/eclipse/ in location field then press OK.

5. Now check the ckeck boxes left to new android update site name. And press Install

6. Check all check boxex in new popup window and click Finish.

7. Next follow the normal installation steps to complete installation.

Now your eclipse is ready for android software development.

Silicon Magic

ORA-14552: cannot perform a DDL, commit or rollback inside a query or DML

Java By Example: Java Calendar day, month, week, year, hour getting, java.util.Calendar

Java By Example: Java Menue Example [ javax.swing.JMenu ]

Java Vector to array or List to array

Java Sorting Array, List

ORACLE: Getting maximum sub string

ORA-01704: String literal too long

Java by Example: Exception Handling, creating custom exception class

Java by Example: Exception handling – throw custom Exception

Java By Example: Exception Handling – Throwing exception from method

Java by Example: Exception handling – Basic Exception Handling example ‘try catch’

Java by Example: Exception Handling – Java Exception Basics

Oracle : Hierarchical Data/ Tree in Oracle

ORACLE - ALTER TABLE: Rename Table

Oracle : ALTER TABLE: Add Columns

Java Difference between Hashtable and Hashmap / Hashtable versus Hashmap

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Using cookie in Java servlet/ jsp

Using Session in JSP

Using SVN

SVN Installation (on Unix/Linux)

Print a part of a webpage using javascript

Print a part of a webpage using javascript

Eclipse plug-in for android development

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