Question

Set up JNDI datasource

Asked by: aman0711

hi all,
        I am using Websphere 6.0 and I am able to create a jndi datasource through admin console and gave it a name jdbc/asm_met. Now can anyone please tell me the code how to access this datasource in a jsp page. I want to use JSTL for running the queries.
      Please provide me the detail code for accessing it through my jsp.

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Asked On
2008-12-03 at 14:17:59ID23955000
Tags

JNDI, JSTL

,

WebSphere

Topics

Java Naming & Directory Interface (JNDI)

,

Java Standard Tag Library (JSTL) & Server Tags

Participating Experts
2
Points
500
Comments
8

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Answers

 

by: dnunes_brPosted on 2008-12-03 at 18:32:38ID: 23092268

Here is a good tutorial from Apache:

http://tomcat.apache.org/tomcat-4.1-doc/jndi-datasource-examples-howto.html

It's the same logic, but you have already configured the JNDI in your WSAD. Just see the code to use JNDI datasource.

 

by: KuldeepchaturvediPosted on 2008-12-04 at 10:12:33ID: 23097783

the page that dnunes have provided does not have jstl example..
but here is how you will put it on your jstl page

<sql:query var="result" dataSource="jdbc/asm_met">
        SELECT * FROM yourtable
    </sql:query>

<table border="1">

        <%-- Output column names on a header row --%>
        <tr>
            <c:forEach var="columnName" items="${result.columnNames}">
                <th><c:out value="${columnName}"/></th>
            </c:forEach>
        </tr>

        <%-- Output each row of data --%>
        <c:forEach var="row" items="${result.rowsByIndex}">
            <tr>
                <%-- Output each column of data --%>
                <c:forEach var="col" items="${row}">
                    <td><c:out value="${col}"/></td>
                </c:forEach>
            </tr>
        </c:forEach>
    </table>

 

by: aman0711Posted on 2008-12-04 at 10:52:55ID: 23098135

Thanks Kuldeep,
           you are right. That page doesnt have the jstl example but it did give some good info. one last question Kuldeep. Do I need to make any other changes in my web application for accessing the jdbc/asm_met ?
          I added a resource definition in web.xml as:
                                           <res-ref-name>asm_met</res-ref-name>
            <res-type>javax.sql.DataSource</res-type>
            <res-auth>Container</res-auth>
            <res-sharing-scope>Shareable</res-sharing-scope>

Thats all I need to do?

 

by: KuldeepchaturvediPosted on 2008-12-04 at 11:36:42ID: 23098510

if you are using WASD to create your connection and WASD is your app server, you dont even have to change the web xml ( WASD will do that for you)..
For others i.e. updating the web xml is all you need after creating the source in deployment descriptor

 

by: aman0711Posted on 2008-12-04 at 12:59:33ID: 23099385

Kuldeep I am using RAD and WAS 6.0 as my app server.
  I am really stuck here. It automatically did put the new values in web.xml (Deployment descriptor) as you said, but could you please give me a code sample how exactly I need to connect to this database and then run queries from my jsp. Can I obtain a resultset with this, as we get it with regular JDBC connection.
Thanks for your time

 

by: KuldeepchaturvediPosted on 2008-12-04 at 13:04:02ID: 23099436

in my code above

<sql:query var="result" dataSource="jdbc/asm_met">
        SELECT * FROM yourtable
    </sql:query>

will run the query against your database.. and will give the resultset in variable "result"..
in your jsp that is all you will need.

 

by: aman0711Posted on 2008-12-04 at 13:19:36ID: 23099578

hi Kuldeep,
        I got the following error when i tried to run the jsp.
Error 500: Unable to get connection, DataSource invalid: "java.sql.SQLException: No suitable driver
 
    I have attached the jsp code too...  Before executing this I already added the external jar file for oracle driver.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql" %>	
<html>
<head>
<title>test2</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta name="GENERATOR" content="Rational Application Developer">
</head>
<body>
 
<sql:query var="result" dataSource="jdbc/asm_met">
        SELECT * FROM VTLAND.ASM_METRIC
    </sql:query>
</body>
</html>
                                              
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by: KuldeepchaturvediPosted on 2008-12-04 at 14:13:08ID: 23100088

when you test your connection from RAD\WASD does it work?
the error you indicated above usually comes when it can not find the ojdbc14.jar file in class path..

look at the following thread, it may give you some ideas.
http://forums.oracle.com/forums/thread.jspa?threadID=402170&tstart=0

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