In this tutorial you will learn how to use weekday() function of mysql with java servlet.
Mysql WEEKDAY() Function Example Using Java Servlet
In this tutorial you will learn how to use weekday() function of mysql with java servlet.
WEEKDAY() function of mysql gives back a number for a respective day of week. These number are from 0,1----,6 for the day Monday, Tuesday, --------, Sunday respectively.
Syntax :
weekday('date');
Here date is a date value.
Now, since I have to use this function in java servlet program, therefore I have created a java servlet class named MysqlWeekdayServlet 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 WEEKDAY('2011-08-25');" (This query will return the output as 3 ) 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 :
MysqlWeekdayServlet.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 MysqlWeekdayServlet 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";
String user = "root";
String password = "root";
String sql = "SELECT WEEKDAY('2011-08-25') AS WEEKDAY";
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>WEEKDAY</b></td>");
out.println("</tr>");
while(rs.next())
{
String weekday = rs.getString(1);
out.println("<tr>");
out.println("<td align = center>"+weekday+"</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>MysqlWeekdayServlet</servlet-name> <servlet-class>MysqlWeekdayServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>MysqlWeekdayServlet</servlet-name> <url-pattern>/MysqlWeekdayServlet</url-pattern> </servlet-mapping> </web-app>
Output :
When you will execute the above example you will get the output as :
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