Display related records from the database when we click the show all link through JDBC

Introduction

Here we produce two JSP pages, in first the first (Display.jsp) it contains some data with a show all link. When the user clicks on that link, all related data of that link will be displayed in the second JSP page (showall.jsp).

Creation of a context file

Create any folder in any drive as (E:\Jsp). Inside that folder store your .jsp files. Give the Context pathname as JSP and docBase as E:\Jsp, here docBase means the total path where we are storing our .jsp files. These changes are done in the server.xml file, which is present in (E:\Program Files\Apache Software Foundation\Tomcat 6.0\conf) directory.

Server.xml file

<?xml version='1.0' encoding='utf-8'?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
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Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- Note: A "Server" is not itself a "Container", so you may not
define subcomponents such as "Valves" at this level. Documentation at /docs/config/server.html
-->
<?xml version='1.0' encoding='utf-8'?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- Note: A "Server" is not itself a "Container", so you may not
define subcomponents such as "Valves" at this level.
Documentation at /docs/config/server.html
-->
<Server port="8005" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
<Listener className="org.apache.catalina.core.JasperListener" />
<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
<!-- Global JNDI resources
Documentation at /docs/jndi-resources-howto.html
-->
<GlobalNamingResources>
<!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users
-->
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
</GlobalNamingResources>
<!-- A "Service" is a collection of one or more "Connectors" that share
a single "Container" Note: A "Service" is not itself a "Container",
so you may not define subcomponents such as "Valves" at this level.
Documentation at /docs/config/service.html
-->
<Service name="Catalina">
<!--
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="150" minSpareThreads="4"/>
-->
<!-- A "Connector" represents an endpoint by which requests are received
and responses are returned. Documentation at :
Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
Java AJP Connector: /docs/config/ajp.html
APR (HTTP/AJP) Connector: /docs/apr.html
Define a non-SSL HTTP/1.1 Connector on port 8080
-->
<Connector port="8081" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
<!--
<Connector executor="tomcatThreadPool"
port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
-->
<!-- Define a SSL HTTP/1.1 Connector on port 8443
This connector uses the JSSE configuration, when using APR, the
connector should be using the OpenSSL style configuration
described in the APR documentation -->
<!--
<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
maxThreads="150" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS" />
-->
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
<!-- An Engine represents the entry point (within Catalina) that processes
every request. The Engine implementation for Tomcat stand alone
analyzes the HTTP headers included with the request, and passes them
on to the appropriate Host (virtual host).
Documentation at /docs/config/engine.html -->
<!-- You should set jvmRoute to support load-balancing via AJP ie :
<Engine name="Standalone" defaultHost="localhost" jvmRoute="jvm1">
-->
<Engine name="Catalina" defaultHost="localhost">
<!--For clustering, please take a look at documentation at:
/docs/cluster-howto.html (simple how to)
/docs/config/cluster.html (reference documentation) -->
<!--
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
-->
<!-- The request dumper valve dumps useful debugging information about
the request and response data received and sent by Tomcat.
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.valves.RequestDumperValve"/>
-->
<!-- This Realm uses the UserDatabase configured in the global JNDI
resources under the key "UserDatabase". Any edits
that are performed against this UserDatabase are immediately
available for use by the Realm. -->
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
<!-- Define the default virtual host
Note: XML Schema validation will not work with Xerces 2.2.
-->
<Host name="localhost" appBase="webapps"
xmlValidation="false" xmlNamespaceAware="false">
<!-- SingleSignOn valve, share authentication between web applications
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.authenticator.SingleSignOn" />
-->
<!-- Access log processes all example.
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/>
<Context path="/jsp" docBase="E:\Jsp" reloadable="true" debug="0" />
</Host>
</Engine>
</Service>
</Server>

Table creation

First, create an employee table in Oracle and insert some data as below

Create table employee(empid varchar(50),empname varchar(50),empaddress varchar(50),designation varchar(50),salary int)
insert into employee values('E001','Raj','Delhi','Clerk',10000)
insert into employee values('E002','Harry','Mumbai','Player',20000)
insert into employee values('E003','Sunil','Noida','Producer',30000)
insert into employee values('E004','Pollock','Durban','Manager',40000)
insert into employee values('E005','Jonty','Perth','Director',50000)
insert into employee values('E006','Kallis','Oslo','Dean',60000)
insert into employee values('E007','Imran','Dubai','Admin',70000)

Creation of dsn (database source name)

Start-Control panel- Administrative Tools- Data Sources (ODBC)-go to system DSN tab-click add button-select a driver for which you want to set up a data source (for Oracle- Oracle in XE)-select it and click finish-give any name in data source name textbox-then click ok button.

Note:- Here Username=system, Password=pintu and Dsn name=dsn1

Display.jsp

<%@ page import="java.sql.*" %>
<
html >
<
body bgcolor = "Yellow" >
<
table border = "1"
width = "30%"
height = "30%" >
<
tr >
<
th > EMP ID </th >
<
th > EMP NAME </th >
<
th > SALARY </th >
<
th > SHOW ALL </th >
<
/tr>
<%
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:dsn1","system","pintu");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from employee");
while(rs.next())
{
String EmployeeId=rs.getString("empid");
String EmployeeName=rs.getString("empname");
String EmployeeAddress=rs.getString("empaddress");
String Employeedesignation=rs.getString("designation");
int Salary=rs.getInt("salary");
%>
<
tr >
<
td > <%=EmployeeId%> < /td> <
td > <%=EmployeeName%> < /td> <
td > <%=Salary%> < /td> <
td > < a href = 'showall.jsp?id=<%=EmployeeName%>' > Show All < /a> </td >
<
/tr>
<%
}
%>
<
/table> <
/body> <
/html>

showall.jsp

<%@ page import="java.sql.*" %>
<
html >
<
body bgcolor = "Yellow" >
<
table border = "1"
width = "30%"
height = "30%" >
<
tr >
<
th > ID </th >
<
th > NAME </th >
<
th > ADDRESS </th >
<
th > DESIGNATION </th >
<
th > SALARY </th >
<
/tr>
<%
String empname= request.getParameter("id");
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:dsn1","system","pintu");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("select * from employee where empname='"+empname+"'");
while(rs.next())
{
String EmployeeId=rs.getString("empid");
String EmployeeName=rs.getString("empname");
String EmployeeAddress=rs.getString("empaddress");
String Employeedesignation=rs.getString("designation");
int Salary=rs.getInt("salary");
%>
<
tr >
<
td > <%=EmployeeId%> < /td> <
td > <%=EmployeeName%> < /td> <
td > <%=EmployeeAddress%> < /td> <
td > <%=Employeedesignation%> < /td> <
td > <%=Salary%> < /td> <
/tr>
<%
}
%>
<
/table> <
/body> <
/html>

Running the application

Run the tomcat then write the below link in the URL

http://localhost:8081/jsp/

Here JSP is the Context path, which we mentioned in the server.xml file, which is present in (E:\Program Files\Apache Software Foundation\Tomcat 6.0\conf) directory.

After giving the URL a set a listing will come, here only two appears as Display.jsp and showall.jsp click on Display.jsp.

Output

Thanks for reading