So here's the thing. I am a new coder and I am working on my first big project from scratch. My project is using ASP.NET MVC, Google Maps API, Entity Framework, with SQL Server.
I got a very early protype started on my local machine but I'm starting to run into database design complications. I am already new to coding, but somehow have managed to figure out MVC and get a Web API going. However, I am even less experienced than that with databases and database administration. I know how to add/remove database objects and set up tables and all that jazz; that's not a big deal. But I'm having questions such as:
*What is the best way to associate user accounts in my system with their business' information...
*I want my users to be able to add/remove products to their business' inventory table... What is the best way to set up the database to store each individual product.
*What is a good way to pair the information given to me via business owners with the data I pull from Google API.
*Should I create a new object for each inventory item or just list it in a long text string of all inventory items since no details will be needed?
*When do I have my application create an entire new database versus just add a new table in an existing database? For example, should user accounts and businesses be in two separate databases?
These questions are less coding questions and more database setup/administration questions... Questions I'd love to ask someone who has made a big modern commercial database before that handles accounts and inventory and all that. Obviously, coding questions will come up too but a lot of it is just database design.
So, my real question here is... How do most coders do this? I would iamgine a lot of coders are not DB experts... Should I buy a Database Administration book and read it? Should I consult an expert? Since this will be a data-driven application, database setup is important. Thanks!
PS: Please, don't worry about me being overwhelmed. I mean, if this is something that will seriously take 6 months of dedicated study, it may be better left for me to call up someone else... But even though I just started programming a few months back, I'm actually loving getting into all of this and it is not intimidating at all.
Do NOT get a book on database administration, yet. Get a book on database DEVELOPER, admin and dev are very different roles. There is also as site with sample database, ah found it[^], pick one close to your industry and try and understand why the design was used. He is pretty good and faithful to the rules of DB design.
After you have got a feel for DB design feel free to ask silly, or not so silly question here.
Your first 3 questions are answered by foreign keys
You should create 1 table per CLASS of inventory (if an items attributes are so different to an existing class then create a new class).
Your application should NEVER create a new database except for backup (and this should be an admin job not application).
If your scale is going to so huge (as in multiple of terabytes) that storage is an issue then you could split the data into different databases but I have never had to do that.
Never underestimate the power of human stupidity
If you're working on enterprise or Web Applications, it's pretty much a given that you'll need to understand how databases work. There's not getting away from the fact that you can mess yourself up badly if you don't understand normalization, concurrency, and relationships.
The current bar is SQL, and if you're interested in web apps I would strongly encourage you to familiarize yourself with relational design; your model class designs should be informed by the relational system and, more importantly, normalization.
Once you understand the relational schema, then make your life easier by having a look at document stores like Mongo.
"There are three kinds of lies: lies, damned lies and statistics."
- Benjamin Disraeli
I mean, if this is something that will seriously take 6 months of dedicated study
Not sure how to address that part. A database admin who comes into a shop with no other admin should have about 5 years of experience doing just that. So 5 years of a 40 hour a week job.
A place that wants to hack it a bit more with small initial aspirations but whose goal is to deliver a product could get by with a developer who has had 2 years of experience working with databases via a programming language (so familiar with the database but primarily programming is C#, Java, etc.)
How do most coders do this?
Do it every day for years.
Since this will be a data-driven application
Very little that isn't but that doesn't insure that you must use a database.
Please, don't worry about me being overwhelmed...I'm actually loving getting into all
So dive in. You can't learn it if you never start.
There are books about programming with databases. You should find one of those. Database design is a different issue just as design itself is a different issue and I have never found a book that really teaches design well (of any sort.) The basics of programming however does lend itself well to books.
If you don't mind reading then one that focuses on database programming and another that attempts to teach database admin will, over time, help. I have never been a DB Admin but the admin books I do have have been helpful.
As a suggestion try to keep your design as simple as possible.
I am trying to pass a varchar string from C# to MySQL stored procedure to be used in WHERE xx IN (param). I tried it in the basic way below but it's not working and giving no result.
can any one help please.
this is my C#:
sql_connection = new MySqlConnection(serverClass.connectionstring("BlueFile", "BlueFile", "Server"));
sql_command = new MySqlCommand("sp_populate_memo_country_companies", sql_connection);
sql_command.CommandType = CommandType.StoredProcedure;
sql_command.Parameters.AddWithValue("param_country", Convert.ToString(cboToCountry.EditValue)).MySqlDbType = MySqlDbType.VarChar;
// Create data adapter object
sql_adapter = new MySqlDataAdapter();
sql_adapter.SelectCommand = sql_command;
// Create a dataset object and fill with data using data adapter's Fill method
data_set = new DataSet();
DataViewManager dataview_manager = new DataViewManager(data_set);
DataView main_dataview = dataview_manager.CreateDataView(data_set.Tables["companies"]);
cboToCompany.Properties.ValueMember = "location_id";
cboToCompany.Properties.DisplayMember = "company_name";
cboToCompany.Properties.DataSource = main_dataview;
DevExpress.XtraEditors.Controls.LookUpColumnInfo("department_name", 50, "department_name"));
cboToCompany.Properties.PopupSizeable = false;
cboToCompany.EditValue = null;
and this is my stored procedure:
SELECT locations.location_id, companies.company_name, locations.location_name, first_payroll, last_payroll
JOIN country ON country.country_code_alpha2 = locations.country_code
JOIN companies ON companies.company_id = locations.company_id
LEFTJOIN payroll ON payroll.location_id = locations.location_id
WHERE locations.country_code IN (param_country) AND payroll_active = TRUE
Excuse my writing of the statement, it's probably my fault it's not formatted correctly, I'm not that familiar with SQL, I'm just trying to determine if there's a security/privacy issue of someone possibly accessing unread PMs of the forum users.
I suppose another way of saying this, is the query a generic query you'd expect in a mybb forum database, or could it possibly be used to list (maybe not the contents but like a directory or list of PMs that they can then pick out which take their interest) unread PMs that could then be read manually?
I'm just trying to determine if there's a security/privacy issue of someone possibly accessing unread PMs of the forum users.
Yes, by looking at the queries. The query itself won't be showing intent. It may be malicious, it may just be a dev that is testing. Problem is that you do not know the origin.
The fact that you are looking at them implies to me that you do not trust the security of the database, to which I'd have to agree. Instead of looking at a logbook who was in your house, one should be checking the lock and which users have keys. If you are confident about the lock and keys, then it makes little sense to go ask the person who entered the house what their intent is.
If the data is saved in a readable format, then yes, anyone with access to the table could read it. It does not matter what data it is - goes for (read) PM's as well as other tables.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
If the query is actually executing in your database, then you urgently need to review your code to fix the vulnerability. SQLi leaves you vulnerable to a lot worse than information disclosure - it can be used to alter any data in your database, and potentially modify your OS, depending on the configuration.
If it's just appearing in your web logs, and not getting through to the database, then you can probably ignore it.
"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer
It looks like somebody is trying to find and exploit a SQL Injection vulnerability in your site:
I don't see anything in there to escape the current command executed.
You could still be correct, in line with post #2; if the connection-string is exposed, anyone could use that to issue commands. It would be something used to explore the database, which could still be valid use -
More questions; is there a table with that name? Have there been other commands from the same source? Could it have been generated by a tool? (Ever seen what traffic SQLSMS causes?)
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
There's likely a table with that name given it's a mybb forum, although I see where you're coming from, was it custom created for that purpose? Why would there be a table specifically for unreadpms for all users? I hadn't thought about that.
That thought worries me. They entrusted the SQL side of things to members that I personally did not know the reputation of, and I'm not sure how trustworthy they were (I personally hold the ethos you should only entrust to those you can trust).
All I know is information appears to leak from PM but only recently did I put two and two together (I'm not an admin on the site so it's not something I'd spotted conventionally).
Someone made vague insinuations another forum was dealing with an SQL injection, and that remark always bothered me. But I didn't want to prejudice the first hand analysis.
I think best course of action is to assume worse case scenario, assume there is an injection attempt and find a way to lock it down. If there isn't, site gets extra security and I just look daft, and if there is, everyone benefits.
So next question of course is how do you deal with a site that has presumably been attacked by an SQL injection?