java code for Delete Blob From Servlet

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DeleteBlobFromServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException,
ServletException {
Connection conn = null;
PreparedStatement pstmt = null;
String id = "0001";
ServletOutputStream out = response.getOutputStream();
response.setContentType("text/html");
out.println("");

try {
conn = getHSQLConnection();
pstmt = conn.prepareStatement("delete from MyPictures where id = ?");
pstmt.setString(1, id);
pstmt.executeUpdate();
out.println("

deleted photo with id=" + id + "

");
} catch (Exception e) {
out.println("

Error=" + e.getMessage() + "

");
} finally {
try {
pstmt.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

private static Connection getHSQLConnection() throws Exception {
Class.forName("org.hsqldb.jdbcDriver");
System.out.println("Driver Loaded.");
String url = "jdbc:hsqldb:data/tutorial";
return DriverManager.getConnection(url, "sa", "");
}

public static Connection getMySqlConnection() throws Exception {
String driver = "org.gjt.mm.mysql.Driver";
String url = "jdbc:mysql://localhost/demo2s";
String username = "oost";
String password = "oost";

Class.forName(driver);
Connection conn = DriverManager.getConnection(url, username, password);
return conn;
}

public static Connection getOracleConnection() throws Exception {
String driver = "oracle.jdbc.driver.OracleDriver";
String url = "jdbc:oracle:thin:@localhost:1521:databaseName";
String username = "username";
String password = "password";

Class.forName(driver); // load Oracle driver
Connection conn = DriverManager.getConnection(url, username, password);
return conn;
}

}