how to connect to database in JavaScript, when we are application running on server.

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Java

JSP

help me i am hosting java web database application first time.The code which where running on netbeans it is not working there.I use the code as follows:

   <%
           
             String un=request.getParameter("username");
             String pass=request.getParameter("password");
            Connection conn = null;
            boolean i=false;
            int flag=0;
      try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch(ClassNotFoundException e) {
      out.println("exceptoin 0");
}
// connect to DB
try{
conn = DriverManager.getConnection("jdbc:odbc:SIM","sanket","raut8989");
    } 
           catch(SQLException se1) {
out.println("exception 1");
}
//out.println("connection is successful!!!");
       
        try{
         
          
            Statement stmt = conn.createStatement();
            ResultSet rs=stmt.executeQuery("select * from authen");
            
            while(rs.next())
            {
                if(rs.getString(1).equals(un.trim()) && rs.getString(2).equals(pass.trim()))
                               {
                                i=true;
                                }
               
             if(i==true)
            {
               session.setAttribute("username",un);
               flag=1;
               RequestDispatcher dispatcher =
         request.getRequestDispatcher("home.jsp");
      if (dispatcher != null)
         dispatcher.forward(request, response);
               
            }
          else
           {    flag=0;
               out.println("Wromg username password");
           }
           
            }
        }  
         catch(SQLException s5)
         {
             out.println(s5);
         } 
        %>