Mysql MAKETIME() Function Example Using Java Servlet

In this section you will learn about how to use mysql maketime() function in java servlet.

Mysql MAKETIME() Function Example Using Java Servlet

In this section you will learn about how to use mysql maketime() function in java servlet.

MAKETIME() function of mysql creates a time for you by taking an input as three numeric argument. These argument belongs to hour(s), minute(s), second(s) respectively. When you will use it in mysql the value of hour may greater than 23 but, when you will use it in java value of hour greater than 23 may throws an exception ( Illegal hour value '24' for java.sql.Time ). And if you are entering the wrong values for 'minute' and 'second' i.e. values greater than 59, will return 'null'.

Syntax :

maketime(hour(s), minute(s), second(s) );

Here the arguments hour(s) denotes hour(s) part of time, minute(s) denotes minute(s) part of time, and second(s) denotes second(s) part of time.

Now, since I have to use this function in java servlet program, therefore I have created a java servlet class named MysqlMaketimeFunctionServlet which extends the HttpServlet class. In the body of class I overridden the method doGet() and created an objects of HttpServletRequest and HttpServletResponse into its parameter. Inside the doGet() method first I set the mime type that in which format the browser will show the output. In the next line I used the getWriter() method of ServletResponse interface with the object of HttpServletResponse. HttpServletResponse interface extends this method from the ServletResponse. In continue we have to make a connection between java code and database system. So, since I am using Mysql in the example given below therefore, I am loading the driver of mysql and make a connection by using the getConnection() method of DriverManager class. It returns a Connection. Further I am passing the query "SELECT MAKETIME(23,59,59) AS Time" (This query will return the output as  time 23:59:59) into the parameter of prepareStatement() method of Connection interface which gives an object of PreparedStatement interface. In the next line I used the executeQuery() method of PreparedStatement interface which returns a ResultSet object that holds the result of query. At last I have extracted the result from the ResultSet object.

Example :

MysqlMaketimeFunctionServlet.java

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MysqlMaketimeFunctionServlet extends HttpServlet
{
 public void doGet(HttpServletRequest req, HttpServletResponse res)
  throws IOException, ServletException
  {
   res.setContentType("text/html");
   PrintWriter pw = res.getWriter();
   String className = "com.mysql.jdbc.Driver";
   String url = "jdbc:mysql://192.168.10.13/data";
   String user = "root";
   String password = "root";
   String sql = "SELECT MAKETIME(23,59,59) AS Time_Is";
   Connection con;
   PreparedStatement ps;
   ResultSet rs;
   
   try
   {
   Class.forName(className);
   con = DriverManager.getConnection(url, user, password);
   ps = con.prepareStatement(sql);
   rs = ps.executeQuery();
   
   pw.println("<table>");
   pw.println("<tr>");
   pw.println("<td><b>Time_Is</b></td>");
   pw.println("</tr>");
   
   while(rs.next())
   {
	String time = rs.getString(1);
	pw.println("<tr>");
	pw.println("<td>"+time+"</td>");
	pw.println("</tr>");
   }
   pw.println("</table>");
   }
   catch(SQLException sx)
   {
	 pw.println(sx);
   }
   catch(ClassNotFoundException cx)
   {
	pw.println(cx);
   }
  }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>mysqlDate</display-name>

<servlet>
<servlet-name>MysqlMaketimeFunctionServlet</servlet-name>
<servlet-class>MysqlMaketimeFunctionServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>MysqlMaketimeFunctionServlet</servlet-name>
<url-pattern>/MysqlMaketimeFunctionServlet</url-pattern>
</servlet-mapping>

</web-app>

Output :

When you will execute the above example you will get the output as :

Download Source Code