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Home » Servlet » Database » MYSQL DAYNAME() in Java servlet
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MYSQL DAYNAME() in Java servlet

By Dinesh Thakur

The Function ‘DAY NAME’ will show the day’s Name of the Month.

First we need a table that I create in the database named ‘dbase’ within the reference of mySql(php myAdmin). Then i import all the java packages from java library. Then i made a class which extends the ‘HttpServlet’ Completely. Here after i use service()Method which will use to getting request from the doGet()Method for output on the web browser. Before declaring the required variable i loaded all the drivers for database accessing. Then i declare variables like first i declare ‘connection’ this variable will use to create a link between database and the java code. The other i declare ‘resultSet’ this variable will use to fetch the desired values from the selected columns and the rows from table. The last variable will be ‘preparedStatement’ that variable will be use to execute the selected query like executeQuery() as (Select DAYNAME(‘2014-05-31’)). Here i also use doGet()Method in the last step which will use to bring output on the web browser.

to getting output on the web browser i used ‘HTML’ code and tags that will bring output in tabular form that will make it a manner form.

  
EXAMLPE
 
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MySqlDayName extends HttpServlet
 {
   public void service(HttpServletRequest rq, HttpServletResponse rp)throws IOException, ServletException
      {
         rp.setContentType("text/html");
         PrintWriter disp = rp.getWriter();
         String driver = "com.mysql.jdbc.Driver";
         String url = "jdbc:mysql://localhost/dbase";
         String uid = "root";
         String psw = "root";
         Connection con=null;
         PreparedStatement ps = null;
         ResultSet rs;
         try
           {
               Class.forName(driver);
               con = DriverManager.getConnection(url,uid,psw);
               ps=con.prepareStatement("Select DAYNAME('2014-05-31') AS dn");
               rs = ps.executeQuery();
            String title = "Using Day Name Function";
              String docType ="<!doctype html public \"-//w3c//dtd html 4.0 " + "transitional//en\">\n";
            disp.println(docType + "<html>\n" + "<head><title>" + title + "</title></head>\n" +
               "<body bgcolor=\"#f4efef\">\n" + "<h1 align=\"center\">" + title + "</h1>\n" + "<ul>\n" +
            "<table width=\"50%\" border=\"1\" align=\"center\">\n" + "<th>Day</th>\n"+ "</body> </html>");
              while(rs.next())
                  {
                       String curr = rs.getString(1);
                    disp.println("<tr><td align=\"center\">" + curr +"</td></tr>" );  
                  }     
          }           
                    catch(Exception e) 
                      {
                        e.printStackTrace();
                       }
                        disp.close();
      }
                          public void doPost(HttpServletRequest rq,HttpServletResponse rp)throws IOException,ServletException
                           {
                            doGet(rq,rp);
                           }
 }
 
WEB.XML
 
<servlet>
   <servlet-name>MySqlDayName</servlet-name>
   <servlet-class>MySqlDayName</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlDayName</servlet-name>
   <url-pattern>/MySqlDayName</url-pattern>
</servlet-mapping>

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About Dinesh Thakur
Dinesh ThakurDinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps.

Dinesh Thakur is a Freelance Writer who helps different clients from all over the globe. Dinesh has written over 500+ blogs, 30+ eBooks, and 10000+ Posts for all types of clients.


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