Problem with the result set of postgres

Hi ,

I want to have function which will have a query which will accept a
parameter from my application and on the basis of the parameter retreive a
result set.

You have helped me in getting the result set but if want to pass a parameter
in the WHERE Claues ,i have no idea.

Table structure is

CREATE TABLE ICDN_EVENTREG ( USER_ID VARCHAR(30) NOT NULL , PASSWORD
VARCHAR(16) , EMAIL VARCHAR(80) , DEPARTMENT VARCHAR(30) , FIRST_NAME
VARCHAR(30) , LAST_NAME VARCHAR(30) , DESIGNATION VARCHAR(30) , TYPE
VARCHAR(15) , STATUS VARCHAR(15) DEFAULT 'Pending',DOJ TIMESTAMP) ;

Function body is as bellow

CREATE FUNCTION tester5(varchar, varchar) RETURNS SETOF ICDN_EVENTREG AS
'SELECT
user_id,password,email,department,first_name,last_name,designation,type,stat
us FROM ICDN_EVENTREG WHERE ICDN_EVENTREG.USER_ID = $1 AND
ICDN_EVENTREG.PASSWORD = $2 ' LANGUAGE 'sql';

I want to Know how
1. How to pass parameter to this function
2. How to call this application
3. In this function i am selecting all the fields , if i want to select only
two or three tuples,then how to go about it
4. If have idea about java bean then how to call his function from a Java
Bean.

Thanks for your prompt reply. You are saving me from lot of trouble.

Thanks again

Sandeep