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Hareesha Guntaka
How to Display values from databse into table
1 Answer(s)      2 years ago
Posted in : Servlet Interview Questions


I want to display values from database into table based on condition in query, how to display that? For example i have some number of books in database but i want to display books based on either bookname or authorname, for this i created one html page with fields bookname and authorname and search button and also action for that, if i enter either bookname or authorname and click on search button the values from database based on the bookname or authorname entered must be display as view.


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August 27, 2012 at 2:58 PM


Here is an application that search book by author's name.

1)search.jsp:

<html>
<head>
</head>
<body>
<br><br><br><br><br><br>
<form method="post" name="frm" action="..//search">
<table border="0" width="300" align="center" bgcolor="#CDFFFF">
<tr><td colspan=2 style="font-size:12pt;color:#00000;" align="center">
<h3>Search</h3></td></tr>
<tr><td ><b>Authors Name</b></td>
<td>: <input type="text" name="name" id="name">
</td></tr>
<tr><td colspan=2 align="center">
<input type="submit" name="submit" value="Search"></td></tr>
</table>
</form>
</body>
</html>

2) Search.java:

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.sql.*;
import java.sql.*;
import java.util.*;

public class Search extends HttpServlet{

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException{
response.setContentType("text/html");
PrintWriter out = response.getWriter();

System.out.println("MySQL Connect Example.");
Connection conn = null;
String url = "jdbc:mysql://localhost:3306/";;
String dbName = "register";
String driver = "com.mysql.jdbc.Driver";
String userName = "root";
String password = "root";


Statement st;
try {
Class.forName(driver).newInstance();
conn = DriverManager.getConnection(url+dbName,userName,password);
System.out.println("Connected to the database");
String name = request.getParameter("name");
String query = "select * from books where authorname='"+name+"%'";
st = conn.createStatement();
ResultSet rs = st.executeQuery(query);
out.println("<table border='1'><tr><th>Row Num</th><th>BookCode</th><th>Author Name</th><th>Book Title</th></tr>");
while(rs.next()){

out.println("<tr><td>"+rs.getString(1)+"</td><td>"+rs.getString(2)+"</td><td>"+rs.getString(3)+"</td><td>"+rs.getString(4)+"</td></tr>");
}
out.println("</table>");
conn.close();
System.out.println("Disconnected from database");
} catch (Exception e) {
e.printStackTrace();
}
}
}

3)web.xml:

<servlet-name>Search</servlet-name>
<servlet-class>Search</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Search</servlet-name>
<url-pattern>/Search</url-pattern>
</servlet-mapping>

For information, please go through the following links:

http://www.roseindia.net/jsp/user-search.shtml

http://www.roseindia.net/servlets/search.shtml



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