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Mysql BIN() Function Example Using Java Servlet

Posted in : Java Posted on : September 12, 2011 at 8:05 PM Comments : [ 0 ]

In this tutorial you will learn how to use bin() function of mysql with java servlet.

Mysql BIN() Function Example Using Java Servlet

In this tutorial you will learn how to use bin() function of mysql with java servlet.

BIN function of mysql returns the binary number for an expression. This function throws an exception if you will not entered any number and returns 'null' for the 'null' value.

Syntax :

bin(expression);

Here expression would be a number.

Now, since I have to use this function in java servlet program, therefore I have created a java servlet class named MysqlBinFunctionServlet 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 Next step I am taking an input using the getParameter() method of ServletRequest with the object of HttpServletRequest. In continue we have to establish 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 bin("+bn+")"; (This query will return the binary code for the value input by the user. In this query bn is a variable name that stores the value that is given by the user. getParameter() method is used to take and store the value of this variable in source/java code.) 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 :

Binary.html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Convert String Into Binary</title>
</head>
<body>
<form method="get" action="MysqlBinFunctionServlet">
<table>
<tr><td>Enter Number <input type="text" name="txtName"/></td></tr>
<tr><td align="center"><input type="submit" value="ConvertToBinary"/></td></tr>
</table></form>
</body>
</html>

MysqlBinFunctionServlet.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 MysqlBinFunctionServlet 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 bn = request.getParameter("txtName");

		Connection con;
		PreparedStatement ps, ps1;
		ResultSet rs, rs1;

		try {
			Class.forName(className);
			con = DriverManager.getConnection(url, user, password);
			String str = "select bin("+bn+")";
			ps = con.prepareStatement(str);
			rs = ps.executeQuery();
			while (rs.next()) {
				str = rs.getString(1);
				out.println(str);
			}
		} 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>mysqlStringFunction</display-name>

<servlet-name>MysqlBinFunctionServlet</servlet-name>
<servlet-class>MysqlBinFunctionServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MysqlBinFunctionServlet</servlet-name>
<url-pattern>/MysqlBinFunctionServlet</url-pattern>
</servlet-mapping>

</web-app>

Output :

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