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Home » Servlet » Database » MySql SELECT BETWEEN Query using Java servlet
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MySql SELECT BETWEEN Query using Java servlet

By Dinesh Thakur

While using the between operator it must be remembered that both the values will be included in the range.

We have create a table named ‘inq’ in database named ‘dbase’. after that a class is been declared named ‘JavaServletInBeetweenQuery’ extends the ‘HttpServlet’. with that kind of efforts we need to define some methods which does their job for exporting output. after we just declare Service method()(service method does the job of calling doGet method for getting request). some variables also define as Connection,Resultset,PreparedStatement.Connection variable use to link between database and actual code(FrontEnd and BackEnd).preparedStatement will use to send the query to database like (SELECT last_name, salary FROM inq WHERE salary BETWEEN 12000 AND 20000). this statement will work according to condition it shows.now the next method executeQuery() will execute desired query and statement. and in the end doGet() method will be used to fetch the result on a web browser.

To feel look good the result we use a tabular form concept. for this kind of requirement we use  ‘HTML’ coding and a bit of tags to use Output in Designer look to show on a web browser.  

Example : 
 
JavaServletInBeetweenQuery.java
 
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 JavaServletInBeetweenQuery 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 last_name, salary FROM inq WHERE salary BETWEEN 12000 AND 20000");
              rs = ps.executeQuery();
                      String title = "Employee's Info With The Refrence Of In Beetween Query ";
              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>Last Name</th><th>Salary</th>\n"+ "</body> </html>");
             while(rs.next())
            {
               String l_name = rs.getString("last_name");
                       int sal = rs.getInt("salary");
              disp.println("<tr><td align=\"center\">" + l_name +  "<td align=\"center\">" + sal +"</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>JavaServletInBeetweenQuery</servlet-name>
   <servlet-class>JavaServletInBeetweenQuery</servlet-class>
</servlet>
<!-- servlet mapping -->
<servlet-mapping>
   <servlet-name>JavaServletInBeetweenQuery</servlet-name>
   <url-pattern>/JavaServletInBeetweenQuery </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.

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