Nirmal's Wordpres Blog

Java Beans & Forms

admin — Sat, 30 Apr 2011 17:01:57 +0000




What's your name? 

What's your e-mail address? 

What's your age?


package user;

public class UserData {

    String username;
    String email;
    int age;

    public void setUsername( String value )
    {
        username = value;
    }

    public void setEmail( String value )
    {
        email = value;
    }

    public void setAge( int value )
    {
        age = value;
    }

    public String getUsername() { return username; }

    public String getEmail() { return email; }

    public int getAge() { return age; }


 


Continue

 


You entered

Name: <%= user.getUsername() %>

Email: <%= user.getEmail() %>

Age: <%= user.getAge() %>

How to declare JSP

admin — Sat, 30 Apr 2011 15:57:44 +0000

<%@ page import="java.util.*" %>


<%!
    Date theDate = new Date();
    Date getDate()
    {
        System.out.println( "In getDate() method" );
        return theDate;
    }
%>
Hello!  The time is now <%= getDate() %>

Using Scriptlets and HTML in jsp

admin — Sat, 30 Apr 2011 05:13:25 +0000

<%
int n=10;
for ( int i = 0; i %>

<%
}
%>
Number <%= i+1 %>

Using Scriptlets in JSP

admin — Sat, 30 Apr 2011 05:07:27 +0000

JSP also allows you to write blocks of Java code inside the JSP. This block of code is known as a “scriptlet”. A scriptlet contains Java code that is executed every time the JSP is invoked.



<%
    // This is a scriptlet.  Notice that the "date"
    // variable we declare here is available in the
    // embedded expression later on.
    System.out.println( "Evaluating date now" );
    java.util.Date date = new java.util.Date();
%>
Hello!  The time is now <%= date %>

Displaying current time in JSP

admin — Sat, 30 Apr 2011 05:03:51 +0000



Hello!  The time is now <%= new java.util.Date() %>

Packages in PL/SQL

admin — Mon, 13 Dec 2010 08:58:12 +0000

CREATE OR REPLACE PACKAGE BODY emp_actions AS — body
PROCEDURE hire_employee ( ename VARCHAR2, job VARCHAR2, mgr NUMBER, sal NUMBER, comm NUMBER, deptno NUMBER) IS
BEGIN
INSERT INTO emp VALUES (emp_sec.NEXTVAL, ename, job, mgr, SYSDATE, sal, comm, deptno);
COMMIT;
END hire_employee;

PROCEDURE fire_employee (emp_id NUMBER) IS
BEGIN
DELETE FROM emp WHERE empno = emp_id;
COMMIT;
END fire_employee;

END emp_actions;

Structure of PL/SQL Block

admin — Mon, 13 Dec 2010 08:02:26 +0000

[]

[DECLARE

]

BEGIN

[Exceptions ]

END;

BLOCK HEADER specifies whether the PL/SQL block is procedure, a function or a package. If no header is specified, the block is said to be an anonymous PL/SQL block.

GOTO statement in PL/SQL

admin — Mon, 13 Dec 2010 07:58:01 +0000

Example:

IF result= ‘fail’

THEN

GOTO fail_msg

END IF;

<>

Message (“Student is Failed’);

While Loop in PL/SQL

admin — Mon, 13 Dec 2010 07:54:45 +0000

Syntax:

WHILE < Condition true> LOOP

END LOOP;

Example:

DECLARE

cnt NUMBER:=0;

BEGIN

WHILE cnt<=10 LOOP

cnt:=cnt+1;

Message (‘While loop executes);

END LOOP;

END;

LOOP in PL/SQL

admin — Mon, 13 Dec 2010 07:51:31 +0000

Syntax:

LOOP

statements

END LOOP;

Example:

DECLARE

cntr NUMBER :=0;

BEGIN

LOOP

cntr :=cntr +1;

IF cntr>100 THEN

Dbms_Output.put_line (cntr);

EXIT;

END IF;

END LOOP;