I want to create a website that queries and inserts data to and from my configured SQL Database. I have not been able to write any code yet because I can't find any reference or documentation for Javascript.
If you are looking for any solution about querying data against SQL Database from browser in javascript, I strongly don't recommend it. Because everyone browsing your website, can find your SQL Database's connection info. And your SQL Database will be exposed to public.
I recommend you to build a backend application for querying data from your SQL Database, and provides the data to your front website.
For more info about how to use the backend languages to connect to SQL Database, please refer to https://azure.microsoft.com/en-us/documentation/articles/sql-database-develop-nodejs-simple/.
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I have a .csv that I want to use as a database and run SQL queries on it from the browser. (Ideally I want to upload the .csv, first. But It could also be stored). Thought this could be done with Django and a Postgres database. Are there simpler ways of accomplishing this?
Is WebSQL an option? Is there something else, I haven't thought of?
Ideally I would want to avoid SQL injections. I tried searching on stack overflow and found this (Display SQL query results in php), but it's not what I'm looking for.
Basically the desired functionality is: when one comes to webpage, they can run SQL queries on the data in the .csv. They type queries in an HTML form and submit the form and then the results would be shown on the same page with actual query.
Use an in-browser library to load the data from the csv file, for example Papa Parse, then equally using an in-browser library, but this time for SQLite, create an empty in-memory database, populate it with the loaded data from the csv file, and then query the database with the same library.
It appears that you are asking if you trigger/run SQL queries against some SQL database directly from a UI. While this is theoretically possible, in practice it is a very bad idea. The reason it is a bad idea is that to do so you would have to open one or more database ports to the outside. This in turn would expose the database to DOS (denial of service) and other types of malicious attacks.
The proper way to proceed would be to place your database behind the backend of your web application. Then, expose one or more endpoints in your backend which in turn talk privately to the database. Finally, allow your UI to hit the backend endpoints to run whatever SQL logic you want.
The information that I want to save of my web page clients can be put in only 1 sql table, but maybe its better to use a javascript object like database no? I'm not sure if the javascript object will support the clients traffic in my CRUD web page. I'm using node js with express for the server :)
I have created a mySQL database at a Host IP, but now wish to use GraphQL to make queries easier from the front-end. I've know how to set up a GraphQL server from scratch, but was unsure how to access my pre-existing tables at the back-end, and where to define the schema to use them. How would I connect to the database from a GraphQL server?
Prisma was an option I considered, but the service doesn't allow connections to mySQL databases which have pre-existing data.
Thanks for the help!
Prisma and other ORMs are a good option if you want a relatively easy/cheap way to expose CRUD operations for your entire database.
If you only need to expose specific aspects of your data or just need to start iterating quickly, you can define your GraphQL API schema at the server level and write resolvers that connect to your database as needed. Your schema does not need to reflect your entire database, but only the data you'd like to expose to clients.
In my experience with GraphQL APIs, I've found that manually writing query schemas and creating resolvers as needed for servicing the client is both faster and easier to maintain for smaller applications.
You can use a SQL client like https://github.com/mysqljs/mysql to interface with your database. The resolvers you write for your schema would then query your database for any data needed to serve the client's request, even if it spans multiple tables.
The GraphQL spec learning site graphql.org has a good description of this process https://graphql.org/learn/execution/#root-fields-resolvers
You can try a new open source tool called SwitchQL (github.com/SwitchQL/SwitchQL). I've been working on the project for a while.
You pass it your connection string and it returns everything you need to run a graphql server on top of an existing database. It also returns Apollo compliant client mutation and queries.
We only support Postgres at the moment. If you end up trying it out, please let me know what you think!
Im just starting out using Azure and i have minimal experience with SQL, so I'm a little confused. I set up my Azure Webapp to pull from a Git repository on bitbucket. I successfully linked those two together, and pushes made to bitbucket update my site. What I am having trouble doing is linking my database on Azure to this site, so that I can make data entry forms and insert that info as records onto this database. Im just starting out simple to learn the basics. I have a table names Users with the elements, id(which is set up as IDENTITY so it sequentially creates a unique id number), username, password, and email. I can pull the info from the HTML document and everything just fine, but how do I correctly link my DB and its tables using HTML, js, and azure? Ill post any additional info that will be necessary, i dont even know where to begin on this really.
Ill also add im using Visual Studio for creating tables and entities and most DB management.
Thanks in advance.
How to access your database depends on the database you are using and the server side programming language. From the tags you used in your question I assume you are using the mysql database provided by clear db through the Azure Management Portal. You can not access your database right from JS. As you are using VS I guess you are using asp.net on the server side. If using asp.net this article might help: https://msdn.microsoft.com/en-us/library/ms178371%28v=vs.100%29.aspx
If you created a ms sql database through the SQL Database service in MS Azure you also need to check the firewall settings to allow access from your app.
I'm interning for a company and have been given an assignment. I'm to write a Javascript script (it's for internal use only; security is not a concern) that accesses an RDS database on an AWS instance, grabs a list of email addresses, and uses the server's smtp to send emails to the whole list. The problem is that I know nothing about AWS and RDS. Here are the things I was provided:
--Server address, port, and credentials file of smtp server
--Address of AWS DB, and its username, password, database name, and table
--The company's server url, security key, and I was also given SSH and SCP commands.
Where do I start learning how to do this? I feel like it's within my grasp, but I just don't know the overall process of what I need to do to get this information. I've never used SQL or RDS before. Any direction whatsoever would be appreciated!
Try to break the problem down into chunks:
Write your Database Query as SQL
If the RDS database instance in question is publicly available, try to connect to it with your preferred (GUI?) SQL client, and inspect its tables. Figure out how to write the SQL query you need in order to grab the e-mail addresses you'll need in the next step, e.g. select email_address from users where user_type='Internal'. The w3schools SQL Introduction is a good place to start.
If the RDS database instance isn't publicly available (i.e. if you can only connect to the database from within AWS - from the server on which you plan to run your code), then figure out how to log in to that server using SSH or RDP, and then use a database client on your AWS server to write and test your SQL query.
Check first that you're not logging into a production machine that you could break by mistake.
Use a Server-Side program to run your SQL query
You must then connect to the RDS database instance using some code that runs server-side. If you're using a server-side JavaScript environment such as NodeJS, this is fine, but whilst it's potentially feasible to use JavaScript directly from a browser to connect to a database, it's not good practice, even for your assignment, so make sure you're using some server-side code.
Find out what your company's usual platform is (Java? Python? PHP? NodeJS?) and go with that. Search the internet for example code - you'll easily find some, because querying a database is an extremely common programming task. Since you've already got your SQL query, you'll be able to write some simple code that connects to the database and grabs your desired email addresses. For now, just have it print them out to a log file or to the console.
Send a test e-mail
Separately, in your server-side program, figure out how to connect to your company's SMTP server and send an e-mail to yourself, as a start. Again, search the internet for examples in your chosen programming language.
Once you've done that, define two or three e-mail addresses in an array or list, and figure out how to send the same message to these users simultaneously.
Connect your Database Query Code and SMTP Code
You're able to query the database, and you're able to send an e-mail to multiple users. Now add to your code to join those two functions together. Don't spam everyone in your firm and get yourself fired!
You mentioned JavaScript
Make sure you are clear about the requirements of your assignment. Should the program be started from a browser? Does a user need to click a button on a webpage saying 'Send Email'? If so, figure out how to submit a request to your server to have the server-side code execute. Search the internet for examples of POSTing HTML forms from JavaScript.
Good luck!