Display Related Data From Database Through JSP

Satyapriya Nayak
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In this article we will know how to display related records from the database into a table when we choose any item in a combo box using jsp through jdbc connection.

Creation of a context file

Create any folder in any drive as (E:\Jsp). Inside that folder store your .jsp files. Give the Context path name 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

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.
-->

<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" />

<GlobalNamingResources>
    
    <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>

<Service name="Catalina">

<Connector port="8081" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />

<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />

<Engine name="Catalina" defaultHost="localhost">

<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
             resourceName="UserDatabase"/>

<Host name="localhost" appBase="webapps"
            unpackWARs="true" autoDeploy="true"
            xmlValidation="false" xmlNamespaceAware="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(10),empname varchar(10),sal int,job varchar(10))

insert into employee values('e001','Raj',10000,'Clerk')
insert into employee values('e002','Harry',20000,'Player')
insert into employee values('e003','Sunil',30000,'Producer')
insert into employee values('e004','Pollock',40000,'Manager')
insert into employee values('e005','Jonty',50000,'Director')
insert into employee values('e006','Kallis',60000,'Dean')
insert into employee values('e007','Richard',70000,'Admin')

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 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

RelatedCombo.jsp

<%@ page import="java.sql.*" %>
<html>
<body>
<form name="f1">
<%
String st=request.getParameter("s1");
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:dsn1","system","pintu");
Statement stmt=con.createStatement();
Statement stmt1=con.createStatement();
ResultSet rs=stmt.executeQuery("select distinct job from employee");
%>
<h4><font color='Red'>Select any Job</font></h4><select name="s1" onChange="document.f1.submit()">
<option>SELECT </option>
<%
while(rs.next())
   {
    String x=rs.getString("job");
   %>
<option <%
           if(st !=null && st.equals(x))
   out.println("selected");
      %>
    ><%=x%></option>
<%
   }
   %>
</select>

<%
     if(st !=null)
       {
   ResultSet rs1=stmt1.executeQuery("select * from employee where job='"+st+"'");
%>
<table border="1" width="20%" height="20%">
<tr><th>Emp Id</th><th>Emp Name</th><th>Salary</th></tr>
<%
while(rs1.next())
{
       String EmployeeId=rs1.getString("empid");
       String EmployeeName=rs1.getString("empname");
       int Salary=rs1.getInt("sal");

   %>
            <tr>
            <td><b><font color='#663300'><%=EmployeeId%></font></b></td>
            <td><b><font color='#663300'><%=EmployeeName%></font></b></td>
            <td><b><font color='#663300'><%=Salary%></font></b></td>
            </tr>
<%
    }//end of while
%>
</table>
<%
   } //end of if
%>
</select>
</form>
</body>
</html>

Running the application

Run the tomcat then write the below line 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 one appears

As RelatedCombo.jsp,click it

http://localhost:8081/jsp/RelatedCombo.jsp

Output

Thanks for reading

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