I'm running a large classic-asp site (self-developed) for a public library (25k users) which actually performs really good (oracle 11g r2 database), but from time to time new services need to be added or old ones adapted.
And there's my dilemma. Every time I work on this site I feel like I should not update this outdated monster no more and that I should port it to a up to date technology. But how to start? I have good knowledge in developing asp.net (vb.net) websites and I’m searching for a way to rewrite code in .net (Webforms, MVC, WebApi, ... ?) and integrate it part by part into the classic asp site, (I can't rewrite the whole thing at once, because I haven't enough time!) so that some time from now on the site will be completely rewritten.
Another thing I need to consider is the Oracle DB and the already existing and optimized (and often oracle specific) SQL statements that I definitely want to use in the new built (so entity framework and linq seems not an option).
I was thinking about using the new WebApi and call the actions via jQuery from the classic asp site, but couldn't find an easy way to interact it with ODP (returning and accepting Json).
I'm really hoping for anyone to point me into the right direction!
If possible you will need to break your existing website into modules can be separated out and rewritten individually.
Because you are doing such a massive rework between an outdated technology (classic ASP) and bleeding edge (WebAPI etc), it probably won't be possible to run the two as a single application. You will instead have to run two separate applications side by side which will behave as a single application for the user. Part by part you will move your separated modules from the old application to the new.
If you want to continue using Oracle, it's still possible to use Linq and Entity Framework as these are used for querying your data rather than actually storing it. You can use Oracle, MSSQL or even one of the newer document databases such as Mongo or Raven DB.
Related
I am currently a front end developer. I know HTML and CSS pretty well, I'm OK with jQuery and know some Vanilla JS. I have an idea for a website I want to create where I will be storing data for products (data that I will be grabbing from various websites around the web). It's basically a help me choose application where the user will go through some steps and be given some choices based on their selections. This site is nothing new, but it's more for learning purposes/portfolio work.
Most of my co-workers use ASP.NET and I've seen that you can setup a website like this using ASP.NET and the provided server controls along with C#, however, I want to take another route that allows me to do the same thing NOT using ASP.NET (C# is OK and preferred if that is possible) in that I can grab data, store data, and bind data to my page.
In addition to this, I would like to do this on the Mac.
Here's a list of things I have looked at:
MongoDB (I was really confused by the setup and didn't read anywhere that this would definitely be the solution).
AngularJS
EmberJS
BackboneJS
Several other JS frameworks
Ruby on Rails
Note about the above: Some of the above might be the solution, but I don't want to start spending time learning them only to realize a week in that this is not going to help me get to my goal.
If this post would be better suited for another stack site please let me know. Thank you.
To create a basic website with a persistence you'll need to deal with three parts the front-end (client), back-end (server) and the persistence (database). Of the things that you've listed Angular, Ember and Backbone are all front-end frameworks. They each have their own way of approaching the issue but they all work in the client facing part of the project so views, interaction and dispatching data to the backend. Rails is the only thing that you've listed that's a back-end framework, another option for the back-end if you're more familiar with JS might be Node and Express. Node allows you to build a server in JS and Express is one of the more popular Node frameworks. That section will be responsible for getting the calls for data and calls with data from the front-end and dispatching the appropriate response. Rails typically works with with a SQL database like MySQL or PostGres out of the box because Rails' active record is meant to work with SQL. Mongo is a NoSQL database and I think people are getting it working with Rails but I don't know that it's highly common. Mongo's shell is pretty much javascript and it stores data as JSON (not technically but close enough) so it's been a comfortable choice for JS developers learning back-end. Either Rails or Node can get a server up and running locally on your machine so you can work with the full architecture. So what it comes down to really is picking one of each from those sections and making them play nicely together. For your purposes I would think that the way to go would be either a basic Rails app (probably with MySQL) and using jQuery ajax calls to manage some calls from the front-end or building something with the so-called MEAN stack (Mongo, Express, Angular, Node) which is all JS and using Angulars built in http functionality to handle those calls. Hope this at least narrowed the field of research a bit. Really thats a pretty open question and there are a lot of options.
What is your webhosting site? I suggestPhpmyadmin Or Mysqldatabase You can create tables and strings where you can put the websites you wanna "grab" data from and put a little javascript in there to tell your website if blahblahnlah =blahblahblah then get id="website1"
Some clarifications:
At first, you need to distinguish between a server side language (used to program the functionality) and a database (used to store data).
C# is a language of the .net framework. Regarding websites, there's no C# without ASP.net.
There are two major groups for realizing back end solutions: PHP (market share ~ 40%) and ASP (~ 25%). PHP is a programming language, ASP.net incorporates several programming languages (mainly C# and VB.net).
Both worlds are able to connect to databases: For PHP, this is mainly MySQL, for ASP.net it is mostly Microsoft SQL server.
I have ASP.NET project and I want to know what is better to use.
ODBC connection and with Server Explorer (drag and drop make DataSet and modify it) or do some DBconnect class with connection to database, queries and use it for GridView?
When I use server explorer, I don't have good feeling because all logic is on aspx page and I do not separate from the application layer logic layer.
It will be a lagre application, databese(PostreSQL) have 18 tables and difficult constraints and application have to generate some documents etc. .
"Better" depends entirely on your situation. Is the purpose to get something done as quickly as possible for internal users at your company, or is this going to be a commercial site that will need to be highly extensible and needs to be as easy as possible to maintain? Will you need to integrate with other platforms possibly built using other languages at some point? The answers to all of these questions should affect your decision.
If you're looking to separate your project into distinct layers, then I would recommend an ORM such as NHibernate or Entity Framework (there are other commercially available ORM products out there, but these are the ones I'm familiar with and which you can easily get help with on this site).
Create a DataSource with LINQ to Entity. It let you the liberty of LINQ with the peace of mind of when you change something il will break your build so you will be able to debug more efficiently.
Well if you have total flexibility, I would recommend using C# ASP.NET 4 with MVC3 razor for the UI and application code. Use Entity Framework 4.1 code first for the data access layer.
This way you will always work with real objects that you create, and with List<realtype> instead of the total mess that exists with datasets.
What would be the pros and cons of taking a large (16000 LOC) existing Access 2007/Forms application and porting it to SQL Server 2005, while keeping the Access forms on the front end, versus porting the front end to a .NET technology, say ASP.NET 4.0 or MVC3? The backend is definitely getting ported to SQL Server, with large schema modifications, so this question is about whether to use the existing Access Forms front end or not. I don't take throwing away existing working code lightly! On the other hand, the schema will be changing a lot.
If you had a lot of experience with ASP.NET/Oracle but not with Access or SQL Server, how might this change your answer?
Thanks,
Mike
There is nothing wrong with Access as a front-end to an RDBMS whether SQL Server or another
Porting the front-end but leaving an Access back-end would seem a bit weird: why bother? Access is a good presentation tool but mediocre DBMS. Why keep the mediocre?
Also, only change one component at once no matter what you do: data, then front end. Don't do a big bang approach and change the lot
Actually, comparing going with web application (ASP.NET) and stand-alone (Access) is not truly "apples-to-apples" comparison. It highly depends on your requirements.
Sure, going with web application will require much more developer's efforts comparing to building forms/reports in Access. But, the pay-off will be felt in the mid to long term.
You should also consider scalability, deployment, and availability issues when deciding to go/stay with Access.
Background:
I am an intermediate web app developer working on the .Net Platform. Most of my work has been defined pretty well for me by my peers or superiors and I have no problem following instructions and getting the job done.
The task at hand:
I was recently asked by an old friend to redo his web app from scratch. His app is extremely antiquated and he is getting overwhelmed by it breaking all the time. The app in question is an inventory / CRM application and currently each customer requires a new install of the app (usually accomplished by deploying it on a different domain on the same server and pointing to a new database).
Currently if any client wants any modifications to the forms such as additional fields, new features, etc my friend goes in and manually adds those fields to the forms, scripts, database etc. As a result all installs of this application are unique. There is no one singular source repository and no one single version of this app. Generally new features are overtime rolled into the other sites, but still this is done on an individual site by site basis.
I will be approaching this on a very modular basis. Initially I will be coding a module that will query an external web service for some data, display and store it, and periodically update it automatically. The next module will likely be for storing and displaying inventory data. This way I want to over time duplicate the current feature set of his app 100% but do it incrementally.
The Million Dollar Questions
I want to make the app have user
configurable form fields. The user
should be able to go to an admin
page, create a new forms page of a
certain category, and then specify
what fields he wants in there. He
could say 'create a new text field
called Item # and make it a
requirement" and that will get
stored somewhere. All forms will be
dynamically rendered to screen based
on what the user has configured. Is
this a good way to go about the
problem of having no idea what a
customer could want in a form? and
thus be able to store and display
form data of any sort ? What sort of
design pattern should I follow here?
I am familiar with asp.net and
the .net framework in general and
have decent knowledge of javascript,
html, silverlight, jquery, c# etc
etc. I can work my way around web
apps in a good way, but I am not
sure what sort of framework or tech
I should use to accomplish this
task. Would ASP.net 3.5 webforms be
the way to go? or should I look into
ASP.NET MVC? Do I use jquery and ajax for
complete decoupling of frontend and
backend ? or will a normal asp.net
page with some spattering of ajax
thrown in working with a codebehind
be the order of the day?
Just looking for general advice before I start.
I am currently thinking of using ASP.NET 3.5 webforms, jquery for clientside animation, ui, manipulation and data validation, and sqlserver + a .net or wcf webservice for backend.
Your advice is much appreciated as always.
I've recently implemented a white-label ecommerce system for an insurance company that allowed each partner to choose their own set of input fields, screens, and order the flow of the application to suit their individual needs.
Although it wasn't rocket science, it added complexity and increased development time.
Consider the user configuration aspect very carefully In hindsight both my client and their clients in turn, would have been happy with a more rigid system.
As for the tech side of your question, I developed my project in VS2005, using asp.net webforms and webservices with a SQLserver back end, so the stack that you're looking at is definitely capable of delivering a working product. ASP.net MVC will almost certainly help as far as testability goes.
The biggest thing I would change now if I was going to start again would be to replace the intermediate webservices with message based services using nServiceBus, MassTransit or the like. While the webservices worked fine, message based communication should be quicker and more reliable.
Finally, before you start to code, make sure that you understand the current system's functionality inside and out. If the new system doesn't do something that the old system did, it will be pretty obvious to the end users straight away.
I am in the early stages of planning a conversion of a large classic ASP database application to ASP.Net and I'm having trouble picking out which data access method to use. I have played around with Linq To SQL, Dynamic Data, strongly typed datasets, Enterprise Library (Data Access Application Blocks), and a tiny bit with Entity Framework, but none of them have jumped out to me as "the one". There are just too many choices - my head is swimming, help me choose!
Perhaps it would help to give some background on the application that I am converting along with the priorities...
The back end is Microsoft SQL Server (2005 or later) and we are committed to that, so I don't need to worry about ever supporting a different database platform.
The database is very mature and contains a great deal of the business logic. It is highly normalized and makes extensive use of stored procedures, triggers, and views. I would rather not reinvent two wheels at the same time, so I'd like to make as few changes to the database as possible. So, I need to choose a data access method that is flexible enough to let me work around any quirks in the database.
The application has many data entry forms and extensive searching and reporting capabilities (reports are another beast which I will tackle later).
The application needs to be flexible enough to deal with minor changes to the database structure. The application (and database) may be installed at different sites where minor custom modifications are made to the database. Ideally the application could identify the database extensions and react appropriately. In other words, if I need to store an O/R mapping in the application, I need to be able to swap that out (or refresh it easily) when installing the application and database at a new site.
Rapid application development is critical. Since the database is already done and the user interface is going to closely match the existing application, I'm hoping to find something where we can crank this out fairly quickly. I am willing to sacrifice not using the absolute latest and greatest technology if it will save time in development. In other words, if there is a steep learning curve to using something like Entity Framework, I'm fine with going something like strongly typed Datasets and a custom DAL if it will speed up the process.
I am a total newbie to ASP.Net but am intimately familiar with Classic ASP, T-SQL and the old ADO (e.g. disconnected recordsets). If any of the data access methods is better suited for someone coming from my background, I might lean in that direction.
Thanks for any advice that you can offer!
Look at all three articles in this series:
High Performance Data Access Layer Architecture Part 1
Great advice.
You may want to look at decoupling the database layer from the asp layer so that you can not only give more flexbility in making the decision, but when you have to make changes to a customer's database you can just swap in a new dll without changing anything else.
By using dependency injection you can use xml to tell the framework which concrete class to use for an interface.
The advantage to doing this is that you can then go with one database approach, and if you later decide to change to another, then you can just change the dll and go on without making any changes to other layers.
Since you are more familiar with it why not just go directly to the database at the moment by making your own connections? Then you can move the rest of your code and along the way you can decide which of the myriad of technologies to use.
For a new application I am working on I am starting with LINQ to SQL for it, mainly because development will be quicker, but, later, if I decide that won't meet my needs I will just swap it out.
nHibernate might be a good fit. You can store the mapping in external configuration files which would solve your needs. Another option might be using ActiveRecord, which is based upon nHibernate.
nHibernate has a neat feature which you might find helpful. It's called a Dynamic property which is basically a name value pair collection populated by pulling the column names from the mapping file. So when you add a column at your client site, you update the mapping file and you'd be able to access the data through a collection on the object.