Access all the fields from table through JSP
This is detailed java program to connect java application with MySql database and execute query to display data from the specified table. Before running this java code you need mysql-connector-java-3.1.6-bin.jar file and set class path to this file.
This is first jsp page that has a link 'show data from table', which displays all the data from table when clicked. This is the code of first welcome jsp page.
welcome_to_database_query.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<html>
<head>
<title>display data from the table using jsp</title>
</head>
<body>
<TABLE style="background-color: #ffffcc;">
<TR>
<TD align="center">
<h2>To display all the data from the table click here...</h2></TD>
</TR>
<TR>
<TD align="center"><A HREF="ConnectJspToMysql.jsp">
<font size="4" color="blue">show data from
table</font></A></TD>
</TR>
</TABLE>
</body>
</html>
Save this code with the name "welcome_to_database_query.jsp" in the application directory in Tomcat. Start tomcat server and type url 'http://localhost:8080/user/welcome_to_database_query.jsp' in address bar of browser and run.
This page has a link, to show data from the database click on the link that calls another .jsp file named ConnectJspToMysql.jsp
ConnectJspToMysql.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<html>
<head>
<title>display data from the table using jsp</title>
</head>
<body>
<h2>Data from the table 'stu_info' of database 'student'</h2>
<%
try {
/* Create string of connection url within specified
format with machine name, port number and database name.
Here machine name id localhost and database name is student. */
String connectionURL = "jdbc:mysql://localhost:3306/student";
// declare a connection by using Connection interface
Connection connection = null;
// declare object of Statement interface that is used for
executing sql statements.
Statement statement = null;
// declare a resultset that uses as a table for output data
from tha table.
ResultSet rs = null;
// Load JBBC driver "com.mysql.jdbc.Driver".
Class.forName("com.mysql.jdbc.Driver").newInstance();
/* Create a connection by using getConnection()
method that takes parameters of string type
connection url, user name and password to connect to database. */
connection = DriverManager.getConnection(connectionURL, "root", "root");
/* createStatement() is used for create statement
object that is used for sending sql statements to the specified database. */
statement = connection.createStatement();
// sql query to retrieve values from the secified table.
String QueryString = "SELECT * from stu_info";
rs = statement.executeQuery(QueryString);
%>
<TABLE cellpadding="15" border="1" style="background-color: #ffffcc;">
<%
while (rs.next()) {
%>
<TR>
<TD><%=rs.getInt(1)%></TD>
<TD><%=rs.getString(2)%></TD>
<TD><%=rs.getString(3)%></TD>
<TD><%=rs.getString(4)%></TD>
</TR>
<% } %>
<%
// close all the connections.
rs.close();
statement.close();
connection.close();
} catch (Exception ex) {
%>
</font>
<font size="+3" color="red"></b>
<%
out.println("Unable to connect to database.");
}
%>
</TABLE><TABLE>
<TR>
<TD><FORM ACTION="welcome_to_database_query.jsp" method="get" >
<button type="submit"><-- back</button></TD>
</TR>
</TABLE>
</font>
</body>
</html>
Save this code with name ConnectJspToMysql.jsp in the same dirctory of welcome_to_database_query.jsp. Click on the link given in the first jsp page,that calls this jsp page and show all data from the table.
Click on the <--back button to go to first page of the application.