I'm working now on an application for iOS (using swift), the database is already exist in SQL Server.
How I will use it and connect with it? Do i need a web service to do that?
thanks all .
It is recommended to use a web service since having the application talk directly to the database means you need to include the SQL Credentials in the binary and anyone with a copy of the application can get them and do whatever they wish in the database. From a security point of view, this is bad.
The correct approach is to have a web server which will host an "API" -- a web application that will receive HTTP requests from the app and translate them to database queries and then will return the response in another format, such as JSON.
However, you need to be careful. This web services must use HTTPS and must first validate the input in order to protect against attacks such as SQL Injection.
Related
How does one go about uploading a database like Apache Cassandra after creating one? Furthermore, is there a way to upload/share only its skeleton structure, without the data gathered in it? I'm on MacOS and would like to use Python to do all of this. Thank you!
Based on your second comment, I guessed it to mean you want the database to be remotely accessible to clients/apps not installed locally.
Clients/apps connect to Cassandra on the IP address set for rpc_address and the CQL port set for native_transport_port (default is 9042) set in cassandra.yaml.
You mentioned that your Cassandra instance is running on your laptop so only clients/apps running on your local network can access it if you configure rpc_address to an IP address accessible on the network (default is localhost).
If you're just trying out Cassandra and want to collaborate with other developer friends, try Astra and launch Cassandra instance on the free-tier (no credit card required). With it you can share the database credentials with your friends and they can connect to it over the internet.
You can connect to Astra from your Python app using the Python driver. Otherwise, Astra includes Stargate.io pre-configured and ready to use. Stargate is a data access gateway that lets you connect to Cassandra from your app using REST API, GraphQL API or JSON/Doc API without having to learn CQL. For more info, see Connecting to your Astra database. Cheers!
I Created SQL Server Database in Azure which is serverless and tried to access it using my SQL Server Management Studio in my local but I couldn't get it work.
It always gives me this message:
I tried to whitelist also my IP in Azure but still I get the same result.
Is there a possible way to make it connect?
Is the database currently online or paused?
I'll repeat the text from #David Browne's link:
If a serverless database is paused, then the first login will resume the database and return an error stating that the database is unavailable with error code 40613. Once the database is resumed, the login must be retried to establish connectivity. Database clients with connection retry logic should not need to be modified.
So;
Assuming the database is paused, this is normal operation
Please read docs
You need to retry after the database starts OR manually pre-start it using the Powershell provided in the link below
https://learn.microsoft.com/en-us/azure/sql-database/sql-database-serverless#connectivity
And yes, you also need to whitelist your IP address as you have already done.
Obviously this flavour of SQL is unsuitable for some types of applications - there is more information in the link - I suggest you read the whole thing.
I’ve created WCF service that connects between a windows 8 app and SQL Server. But now the connection is to be made at runtime, like where the server name is a user input. I wanted to know do we keep adding multiple service references for every connection made to a database? But how do I make these WCF connections at runtime? Or do we have to use variables in the connection string? But then how do I link this variable to the Service.svc.cs file?
IMHO, it can be achieved by using the ClientBase of System.ServiceModel. Please go through this link
I have a silverlight application where when I run the application I read the database and populate the results in the combobox, but when I publish it on the server(IIS) the it returns me a null, I can't even debug the error because it return the result when I host it on my system but null when hosted..
Please guide...
Taking a stab in the dark here. Most likely this is a security issue. When debugging locally, your web server runs under your credentials. If using integrated authentication to your database, then the web service host acts like it is you when making requests to the database. However, when you deploy, the server tries to connect to the database using the credential associated with the application pool that is running your site. Check your database connection string to see if it is pointing to the right database and try using a named user/password with an account that does have access to the database.
If this doesn't fix the problem, try accessing one of your services directly (using Fiddler?) to see what the service is returning as an error message that your Silverlight client is ignoring.
in our architecure,each module communicate with each other using rabbitmq.
so in our situation , if a module want to access database ,first of all,it will call a rpc request using rabbitmq and a module connecting database will return a json-like string.
my question is, is it a good idea for database access?
or is there any good idea that make database being a service?