Mysql SUBTIME() Function Example using java servlet

In this tutorial you will learn how can subtime() function of mysql be used with java servlet

Mysql SUBTIME() Function Example using java servlet

In this tutorial you will learn how can subtime() function of mysql be used with java servlet

SUBTIME() function of mysql returns a datetime/time value after subtracting one datetime/time value from another.

Syntax :

subtime(expr1, expr2);

Here the expr1 and expr2 are datetime/time value.

Now, since I have to use this function in java servlet program, therefore I have created a java servlet class named MysqlSubtimeServlet 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 SUBTIME( ' 2011-08-17 03:02:43.999999','1 03:31:18.000002') AS TIME_AFTER_SUBTRACT;" (This query will return the output as 2011-08-15 23:31:25.999997 ) 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

MysqlSubtimeServlet.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 MysqlSubtimeServlet extends HttpServlet
{
 public void doGet(HttpServletRequest request, HttpServletResponse response)
  throws IOException, ServletException
  {
   response.setContentType("text/html");
   PrintWriter out = response.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 SUBTIME('2011-08-17 03:02:43.999999','1 03:31:18.000002') AS TIME_AFTER_SUBTRACT;";
   
   Connection con;
   PreparedStatement ps;
   ResultSet rs;
   
   try
   {
	Class.forName(className);
	con = DriverManager.getConnection(url, user, password);
	ps = con.prepareStatement(sql);
	rs = ps.executeQuery();
	
	out.println("<table>");
	out.println("<tr>");
	out.println("<td><b>TIME_AFTER_SUBTRACT</b></td>");
	out.println("</tr>");
	
	while(rs.next())
	{
	 String subTime = rs.getString(1);
	 out.println("<tr>");
	 out.println("<td>"+subTime+"</td>");
	 out.println("</tr>");
	}
	out.println("</table>");
   }
   catch(SQLException sx)
   {
	out.println(sx);
   }
   catch(ClassNotFoundException cx)
   {
	out.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>MysqlSubtimeServlet</servlet-name>
<servlet-class>MysqlSubtimeServlet</servlet-class>
</servlet>

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

</web-app>

Output :

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

Download Source Code