Watch “Servlet Part 21 | CRUD operation in Servlet Using JDBC (Gujarati)” on YouTube

#CRUD #Servlet #JDBC #MySql #Eclipse #MySqlWorkbench #ApacheTomcat #Jdk #Java

This video features the CRUD operation using JDBC via servlet only, no JSP page is used to perform any database operation.
CRUD is Create, Read, Update & Delete.

Index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Servlet with JDBC</title>
</head>
<body>
<form action="AddEmp" method="post">
<h1> Employee Management</h1>
<p> Enter Emp. No : <input type="text" name="txtEno"> </p>
<p> Enter Emp. Name : <input type="text" name="txtEname"> </p>
<p> Enter Emp. Salary : <input type="text" name="txtEsalary"> </p>

<p> DB Operation :
<select name="op">
    <option value="1">Add</option>
    <option value="2">Update</option>
    <option value="3">Delete</option>
    <option value="4">Display</option>
</select>
</p>

<p> <input type="submit" value="Submit"> </p>
</form>
</body>
</html>

AddEmp.java

package servletWithJDBC;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;

@WebServlet("/AddEmp")
public class AddEmp extends HttpServlet 
{
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
	{			
		response.setContentType("text/html");
		PrintWriter pw = response.getWriter();
		String op = request.getParameter("op");
		Connection conn;
		PreparedStatement pst=null; 
		String url,username,password,qry="";
		url = "jdbc:mysql://localhost:3306/raviroza";
		username="root";
		password="ravi";	
		
		int eno;
		String ename="";
		float esalary;
		try 
		{
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection(url,username,password);			
			
			if(op.equals("1"))
			{
				eno = Integer.parseInt(request.getParameter("txtEno"));
				ename = request.getParameter("txtEname");
				esalary = Float.parseFloat(request.getParameter("txtEsalary"));
				
				qry = "insert into emp values (?,?,?)";
				pst = conn.prepareStatement(qry);
				pst.setInt(1, eno);
				pst.setString(2, ename);
				pst.setFloat(3, esalary);
				pst.executeUpdate();
			}
			else if(op.equals("2"))
			{
				eno = Integer.parseInt(request.getParameter("txtEno"));
				ename = request.getParameter("txtEname");
				esalary = Float.parseFloat(request.getParameter("txtEsalary"));
				
				qry = "update emp set ename=?,esalary=? where eno=?";
				pst = conn.prepareStatement(qry);				
				pst.setString(1, ename);
				pst.setFloat(2, esalary);
				pst.setInt(3, eno);
				pst.executeUpdate();
			}
			else if(op.equals("3"))
			{
				eno = Integer.parseInt(request.getParameter("txtEno"));
				qry = "delete from emp where eno=?";	
				pst = conn.prepareStatement(qry);								
				pst.setInt(1, eno);
				pst.executeUpdate();
			}								
						
			qry = "select * From Emp Order by eno desc";
			ResultSet rs = conn.prepareStatement(qry).executeQuery();
			pw.println("<table border=1>");
			pw.println("<th>Eno.</th>");
			pw.println("<th>Emp. Name</th>");
			pw.println("<th>Emp. Salary</th>");
			while(rs.next())
			{
				pw.println("<tr>");
				pw.println("<td>"+rs.getString("eno")+"</td>");
				pw.println("<td>"+rs.getString("ename")+"</td>");
				pw.println("<td>"+rs.getString("esalary")+"</td>");
				pw.println("</tr>");
			}
						
			pw.println("<h2> Employee Info. updated Successfully ! </h2>");
			pw.println("<a href='index.html'>Back</a>");
			
			pw.close();
			pst.close();
			conn.close();		
		}
		catch (ClassNotFoundException | SQLException e) 
		{
			pw.println("<h2> Driver|SQL Error "+e.toString() +"</h2>");
		}
	}
}

Overall process of example.

It is generally the table operation to create, access, manipulate, and delete the data from a database table.
Here, only a single Servlet is performing all the CRUD operation. Operation is decided by the client by selecting a proper option from list of choices.

When a client/user select the “Add” option, the internal value of that option is checked to perform the add operation, like wise when user/client select the “Update” operation the record is updated with given details.

If user/client decide to delete the record the valid number is given and the delete operation is carried.

Finally, if user decides to display all the record there is an option called “Display” to view all the details of the table.

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Database : MySQL using MySql Workbench 5.2 CE
Server : Apache Tomcat 7

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https://raviroza.wordpress.com/
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Watch “Servlet Part-16 | How to use Cookies in Servlet (Gujarati)” on YouTube

Video features introduction to Session management.
To track the user session various session tracking approaches are there in servlet.
Here, the Cookies is discussed with suitable example. Index page is used to read user’s name from the client, at the server side there are three servlets. First servlet receives the input/request from the index page, then the session information added using Cookies, then the second servlet also adds the session information in the second servlet using Cookies, and finally third servlet gets the client session information from second servlet.

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Server : Apache Tomcat 7

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https://twitter.com/raviozaIT
https://www.facebook.com/ravi.oza.it

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Watch “Servlet Part-20 | Servlet with JDBC (Gujarati)” on YouTube

#CRUD #Servlet #JDBC #MySql #Eclipse #MySqlWorkbench #ApacheTomcat #Jdk #Java

This video contains the steps and demonstration to define servlet with JDBC using eclipse to connect with MySql database.

Steps to create it.

  1. Create a dynamic web project in eclipse
  2. Configure build path to add database driver (jar files)
  3. Add dependency (database jar file) to projects lib folder
  4. Create in html/jsp page for client
  5. Create a servlet to handle client request
  6. Define JDBC steps to handle database operation in servlet

Project contains JDBC operation such as loading driver, creating connection and adding employee details using prepared statement.

Subscribe channel to get notification of my next video related to database operation such as update, delete, and select.

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Database : MySQL using MySql Workbench 5.2 CE
Server : Apache Tomcat 7

follow me @
https://raviroza.wordpress.com/
https://twitter.com/raviozaIT
https://www.facebook.com/ravi.oza.it

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Watch “Servlet Part 19 | How to use HttpSession in Servlet – Revised (Gujarati)” on YouTube

Video features introduction to Session management.
To track the user session various session tracking approaches are there in servlet.
Here, the HttpSession is discussed with suitable example.
Index page is used for multiple purpose, here i have define two forms which are referring to same form, but with different method type. First form is referring to doGet method whereas later referring to doPost methods.
With doGet method session is defined and doPost method is used to retrieve session the session and its attributes.
Following are the list of files used in the example (index.html, LoginServlet.java).

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Server : Apache Tomcat 7

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https://raviroza.wordpress.com/
https://twitter.com/raviozaIT
https://www.facebook.com/ravi.oza.it

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Watch “Servlet Part-18 | Session Cookies in servlet revised (Gujarati)” on YouTube

Here, the Cookies are added in response object, two cookies with static values are set and the one cookie is set with value from Index page.
index page is used to read user’s name from the client, at the server side there are three servlets. First servlet receives the input/request from the index page, then the session information added using Cookies, then the second servlet also adds the session information in the second servlet using Cookies, and finally third servlet gets the client session information from second servlet.
Video features introduction to Session management.
To track the user session various session tracking approaches are there in servlet.

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Server : Apache Tomcat 7

follow me @
https://raviroza.wordpress.com/
https://twitter.com/raviozaIT
https://www.facebook.com/ravi.oza.it

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Watch “Servlet Part-17 | How to use HttpSeesion in Servlet (Gujarati)” on YouTube

Video features introduction to Session management.
To track the user session various session tracking approaches are there in servlet.
Here, the HttpSession is discussed with suitable example. Index page is used to read user’s name from the client, at the server side there are three servlets. First servlet receives the input/request from the index page, then the session information added using HttpSession, then the second servlet also adds the session information in the second servlet using HttpSession, and finally third servlet gets the client session information from second servlet.

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Server : Apache Tomcat 7

follow me @
https://raviroza.wordpress.com/
https://twitter.com/raviozaIT
https://www.facebook.com/ravi.oza.it

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Watch “Servlet Part-15 | How to use Hidden Form Fields in Servlet (Gujarati)” on YouTube

Video features introduction to Session management.
To track the user session various session tracking approaches are there in servlet.
Here, the Hidden Form fields is discussed with suitable example. Index page is used to read user’s name from the client, at the server side there are three servlets. First servlet receives the input/request from the index page, then the session information added using Hidden Form fields, then the second servlet also adds the session information in the second servlet using Hidden Form fields, and finally third servlet gets the client session information from second servlet.

Normal 0 false false false EN-IN X-NONE GU

OS: Windows 7/10
Jdk: Version 8

IDE: Eclipse Mars
Server: Apache Tomcat 7

Follow me @
https://raviroza.wordpress.com/
https://twitter.com/raviozaIT
https://www.facebook.com/ravi.oza.it

Subscribe my channel to get latest video notification https://www.youtube.com/user/ravioza101

Watch “Servlet Part-14 | How to use URL Rewriting in Servlet (Gujarati)” on YouTube

Video features introduction to Session management.
To track the user session various session tracking approaches are there in servlet.
Here, the URL Rewriting is discussed with suitable example. Index page is used to read user’s name from the client, at the server side there are three servlets. First servlet receives the input/request from the index page, then the session information added using URL rewriting, then the second servlet also adds the session information in the second servlet using URL rewriting, and finally third servlet gets the client session information from second servlet.

OS : Windows 7/10
Jdk : Version 8
IDE : Eclipse Mars
Server : Apache Tomcat 7

follow me @
https://raviroza.wordpress.com/
https://twitter.com/raviozaIT
https://www.facebook.com/ravi.oza.it

Subscribe my channel to get latest video notification https://www.youtube.com/user/ravioza101