I have created a silverlight application and my db is on some host, I have connected my db to silverlight application through wcf service, it runs well on my pc, and bring data from db. But when I host it on dropbox public folder, it runs but db data not coming. i have
It is most likely a connection string problem with this scenario. I typically use the default one from the designer for the localhost and then when I publish I use the connection string for the server. Since you have not given us a DB type or server type here is a universal connection builder site.
ConnectionStrings.com
Related
I uploaded my website to GoDaddy web hosting and the database is placed on another server.
I want to create an API - either REST or SOAP - to connect my web site with my SQL Server database.
I need help - how can I create an API in ASP.NET MVC 5 so that I can connect my database with my web site? Kindly provide me with a link or code so that I can solve my issue.
I have never worked on API before - any help will be much appreciated.
ASP.NET MVC is now old school. Try ASP.NET Core.
You need to design and develop an N-Layered application: Data, Service and UI.
It doesn't matter where the database server is sitting, as long as your WebAPI can connect to it.
I suggest you build a restful web api with asp.net core :
https://learn.microsoft.com/en-us/aspnet/core/tutorials/first-web-api?view=aspnetcore-3.1&tabs=visual-studio
Put your db connection string in the app settings file.
Although you use other database server, it doesn't matter. You just need to make sure you check your connection string and point it to your database server. For publishing method, it is same, you can use FTP or Visual Studio
Please open your project with Visual Studio tool
On the Solution Explorer windows (which is normally located on the top right hand corner of the VS tool), right click your project and select Publish
Please kindly publish it to a local folder, such as C:\Project
Please just upload whatever files/folders you see on C:\Project to your server via FTP
If you have any problems, you can contact your support team
You can get the Reference from
Sample_WebAPI_Project ,
instead of Using List created you can create Database Connection and get data from Database
I am creating simple application where I need get and fetch data to DB. As I find out from Xamarin app is standard using of HTTP request to DB instead of directly connect to DB.
I create Azure SQL DB, I create application with connection to this DB. But I cant really find out how it now should works.
There is no many tutorials or they are not fully described.
I read this one https://learn.microsoft.com/en-us/azure/app-service-mobile/app-service-mobile-xamarin-forms-get-started#download-and-run-the-xamarinforms-solution
I find many references on this one but it seems out of date. Everybody recommended download the project from section
Run the Xamarin.Forms solution
On the settings blade for your Mobile App, click Quickstart (under Deployment) > Xamarin.Forms. Under step 3, click Create a new app if it's not already selected. Next click the Download button.
Under this tab I have only references to next tutorials but not any to Project Download. (screenshot below)
https://imgur.com/THCdUE1
Can you give me some advice if I do something wrong? Or link to updated tutorials? I am little desperate from this
Many Thanks
Azure SQL is not an HTTP/s service-- it runs proprietary SQL Server protocol on port 1433, just like on-premise versions of SQL Server.
If you are trying to connect directly to SQL Server from a Xamarin App, you are almost certainly making a mistake. Doing so would require providing credentials to your Xamarin app that can connect directly to your database, which opens your database up for a malicious user to do pretty much whatever they want to. The reason this kind of 2-tier application is dangerous is because the Xamarin app runs on an untrusted device (your user's mobile device), and a malicious user can intercept any data that your application has in memory, including your database credentials. They can then use those credentials to gain access to your database. Unless you were to use unique database credentials for each user (very impractical) and setup very stringent security roles in SQL Server, it'd be impossible to keep a malicious user from accessing the database for all of your other users (which is very, very bad). The other problem is that many networks block traffic on port 1433, or only allow access via an HTTPS proxy server, so your application would not function on many networks if it tried to connect directly to SQL.
This is the answer to your question, but please don't do this:
If you are certain that you have taken care of the security correctly, you should be able to install the System.Data.SqlClient nuget package and use that to communicate with SQL Server as you would with any .NET application. Here's a code example from Microsoft.
This is my opinion on what you should do instead:
The correct way for most Xamarin applications to communicate with Azure SQL database would be via an intermediary application server.
If your application access data specific to a user, should have per-user credentials in it (username and password that get exchanged for an authorization token when the user logs in is a common technique). The Xamarin app would then use HTTPS to make requests to your application server using those user credentials. The application server would validate the user credentials (authenticate that they are legitimate and authorize the data being requested based on who the user is) and make requests to Azure SQL.
If your application only access public data anonymously, then you can make unauthenticated requests to your application server which will blindly request that data from Azure SQL and return it to your client (though it would also return the same data to any attacker on the internet, so be sure if you use this approach you intend all data served to be public to the world).
In both cases, your application server would be the only piece that communicates with Azure SQL. For a .NET application this would typically be done via System.Data.SqlClient or perhaps indirectly through an ORM like Entity Framreworks. The advantage to this 3-tier approach is that the untrusted client tier does not have unrestricted access to your database tier. Only the middle application server tier has the credentials for SQL Server, and it is trusted and runs in a secure environment (a server you manage, not an end-user's mobile device). This means that an attacker cannot intercept the database credentials and misuse them. It also means that your application only requires HTTPS data access to function, so your application will work on almost any network.
This is probably not the answer you are looking for, since it involves authoring an entire application server that has to be hosted by you (Azure App Service would be my recommendation, if you are already using Azure SQL). It also requires you to implement an API on the server, and then write an API client for your Xamarin application. This is no small amount of work.
I am trying to find code examples of:
1. Remote MVC App on IIS
2. Data is on the customers SQL Server and on the windows domain they are using their web browser from.
I have a MVC app that works well with IIS and SQL Server being on the same domain.
However, I am trying to figure out how to extend the MVC App to multiple customers by hosting the site on a remote IIS server and having the remote MVC application on IIS query the customers SQL Server database.
I am comfortable with MVC, Entity Framework, & SQL Server but have had a hard time finding examples for this scenario.
You can certainly change the connection string of your application to work with any remote SQL Server instance you please. Obviously being outside the domain poses some additional challenges and security risks that you should consider, however, to get them talking to each other you can simply specify the server address in your connection string like so:
Data Source=192.168.10.1,1433;Network Library=DBMSSOCN;Initial Catalog=myDataBase;User ID=myUsername;Password=myPassword;
The Network Library parameter forces the use of TCP/IP as a network protocol. Note that the customer will have to set up a SQL Server Authentication user on their database to simplify this scenario - using a trusted connection will be impossible unless you integrate your Windows domains, which could be a significant amount of work for little benefit.
this is my first project ^_^
and I have no previous experience.
I did create the database in my project from within the MVC.
Add New Item > SQL Server Database
then I use ADO.NET Entity DataModel
and I don't need to open my connection each time I deal with the database.. it's only the connection string in the Web.config..
my question is :
how can I upload my database?
is there any resource for such beginner as me :$ ?
I did Google it but I found it very hard for me to know if this is what I want or not, that's why I came here :$
It really depends on what type of access you have to your server.
If you have remote desktop access then run remote desktop (mstsc in run) and connect to your server.
This article shows how to install your web application in IIS on server.
This blog post from Scott Guthrie shows you how to deploy your sql database to your server.
In case you only have access to your server via a control panel (plesk) you should still be able to do the same via a different interface. (you need to go through the instructions given for the specific control panel you are using).
Hope this helps.
For ASP.Net website, just upload all files using FTP, in wwwroot folder of your hosting.
For SQL Server database there are following option.
Attach your MDF file on hosting database server (if you have remote desktop).
Generate a script of whole database with full data, schema, and indexes etc. and run the script in query editor of your hosting panel.
First of all create a database from your hosting panel and a user for your database then Use SQL Serer 2008 (R2 most preferable) and connect with your hosting SQL Server using hosting server name in Server name, your db user id in User Name, and same for password. And then connect, you will find a long list of databases including your own database. Now right click on your database and import data from your local database server to remote database server.
I want to allow a user to provide their SQL login credentials, and display local SQL tables, stored procs, etc. in a listing. Is this possible? Note: I do not want to install some local, small SQL variant. I'm talking about the full version of SQL 2005+ that's already sitting on a developer's workstation.
Silverlight provides no mechanism for connecting to a SQL Database directly. You either need to provide a set of web services to interface with your data source or use ADO.NET Data services.
Connecting to a local SQL database using Silverlight alone isn't possible.
Something I almost missed is that you don't want to connect back to a database on the web server. You want information about a possible sql server instance on the user's (developer's) local machine. That isn't possible from within Silverlight alone.
I had thought you might be able to send the credentials on to the web server, have it dynamically generate a connection string, and then use the information_schema views to return lists of tables and views like any other data source. But that won't work.
However, in that scenario the web server is essentially acting as a proxy for your silverlight app. You might be able to build something else to act a proxy instead. Perhaps a small clickonce winforms app. That would install from a web page via hyperlink, so you could craft a link to install it on the page hosting your silverlight app.
With silverlight you cannot access the local machine/network resources. you will need to use wpf/xbap.