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Lollygag Demos — Object Access
Accessing Business Objects
A Lollygag application can access a business object just as easily as it can access database data. To call a server-side
business object, you declare a <objectCommand> tag in your DataServices.config file.
For example, the following C# class includes a method named GetMovies that returns a collection of Movie objects.
Movie.cs
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
/// <summary>
/// Returns movies
/// </summary>
public class Movie
{
const string connectionString = @"data source=.\SqlExpress;Integrated Security=true;AttachDbFileName=|DataDirectory|MoviesDB.mdf;User Instance=true";
private string _title;
private string _description;
public string Title
{
get { return _title; }
set { _title = value; }
}
public string Description
{
get { return _description; }
set { _description = value; }
}
public static List<Movie> getMovies()
{
List<Movie> results = new List<Movie>();
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand("SELECT Title, Description FROM Movies", con);
using (con)
{
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
results.Add(new Movie(reader));
}
return results;
}
public Movie(SqlDataReader reader)
{
_title = (string)reader["title"];
_description = (string)reader["description"];
}
public Movie()
{
}
}
The following DataServices.config file exposes the Movie object. Notice that the file contains a
<objectCommand> tag. This tag has two attributes that represent the object name and the object method
to call.
DataServices.config
<?xml version="1.0" encoding="utf-8" ?>
<dataServices
xmlns="http://lollygagframework.com/dataservices"
defaultConnectionStringName="conMovies">
<dataService id="svcMovieObject">
<objectCommand
type="select"
objectName="Movie"
methodName="getMovies"
allowAnonymous="true" />
</dataService>
</dataServices>
After you expose a business object, you can bind to the object from your client-side widgets in exactly the
same way that you bind to database data. The following Lollygag application includes a dataview widget
that displays the data returned by calling the Movie.GetMovies() method.
ShowMovies.xml Try It!
<?xml version="1.0" encoding="utf-8" ?>
<?xml-stylesheet type="text/xsl" href="/lollygagSite/lollygagframework/0_1/lollygag.xsl"?>
<lolly:application
title="Hello World"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:data="http://lollygagframework.com/data"
xmlns:lolly="http://lollygagframework.com/core">
<data:dataview dataServiceId="svcMovieObject">
<data:template>
<h1>{{Title}}</h1>
<p>
{{Description}}
</p>
</data:template>
</data:dataview>
</lolly:application>
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