by Dinesh Thakur Category: Servlet with MySql Database

This Function Will Return the position of the first occurrence of substring LOWER () Return.

Firstly, i made a table in database named 'dbase' with required fields and values in it. I import all the required java packages from the java library. I made a class named 'MySqlLOCATEFunction', which extends the 'HttpServlet'. After, then i use serviceMethod() which will bring the request from doGet()method for output. Then after, i loaded all required drivers for the database accessing declare some mandatory variable for database connecting like i declare 'Connection' (this variable will use to create a link between database and the java code or actual code). The next will be 'resultSet' the variable will be responsible for the getting values from required columns and rows. The other one variable will be 'preparedStatement' this variable will use to execute the Selected Query like executeQuery() as (Select LOCATE('Sql','MySqlSql')).I use doGet()Method which will bring the output on web browser.

To make output efficient we use 'HTML' Code or some of its tag which will bring the output in tabular form or in a manner way on the web Browser.

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 MySqlLOCATEFunction 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 LOCATE('Sql','MySqlSql') as lct");
                rs = ps.executeQuery();
             String title = "Using LOCATE 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>Value Is </th>\n"+ "</body> </html>");
                while(rs.next())
                    {
                         String val = rs.getString(1);
                      disp.println("<tr><td align=\"center\">" + val +"</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>MySqlLOCATEFunction</servlet-name>
   <servlet-class>MySqlLOCATEFunction</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>MySqlLOCATEFunction</servlet-name>
   <url-pattern>/MySqlLOCATEFunction</url-pattern>
</servlet-mapping>




About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.



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