Is oxygen really the most abundant element on the surface of the Moon? in that case, why bothering database?, saving in a file will do. Why even save the data for a proof of concept? How to use stringstream to separate comma separated strings [duplicate] Ask Question Asked 8 ... @DmitryGusarov It's a habit and a good practice. Find the position of the comma (this shows where one word ends and the other begins). A man’s character may be learned from the adjectives which he habitually uses in conversation. In Kotlin, you can declare functions inside. How did Woz write the Apple 1 BASIC before building the computer? I'm also asking because I'm thinking about cleaning up the program and make it more maintainable. @Hammerite - your extrapolation to buses is ridiculous. There are times when you need to employ denormalization, but as @OMG Ponies mentions, these are exception cases. In Ender's Game, who fired the Little Doctor? A second criticism is that putting raw input results directly into a database, without any validation or binding at all, leaves you open to SQL injection attacks. Yes, it was intended to be ridiculous. Modern languages like Kotlin don't even allow static methods. I chose to save them in a comma separated list of values stored in one column of the database table. I would probably take the middle ground: make each field in the CSV into a separate column in the database, but not worry much about normalization (at least for now). Bad Words. rev 2021.2.12.38571, Sorry, we no longer support Internet Explorer, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Placing a comma-separated list of key:value pairs within the braces adds initial key:value pairs to the dictionary; this is also the way dictionaries are written on output. With CSV: Can't use foreign key constraints to link values to a lookup table; no way to enforce referential integrity. I don't see anything in this question that suggests he is vulnerable to SQL injection. SQL injection and database normalisation are orthogonal topics, and your digression on injection is irrelevant to the question. Canât enforce uniqueness: no way to prevent. Yes, I would say that it really is that bad. With CSV: Can't ensure that each value is the right data type: no way to prevent 1,2,3,banana,5, With XML: values in a tag can be forced to be the correct type. Why didn't Escobar's hippos introduced in a single event die out due to inbreeding. Vampires as a never-ending source of mechanical energy. ah, so it sounds like the problem caused by c++ ability to have a method outside of a class. This comes in handy if you some special words like release groups in your file names. What was the earliest system to explicitly support threading based on shared memory? Can't store a list longer than what fits in the string column. SQL Antipatterns: Avoiding the Pitfalls of Database Programming, postgresql.org/docs/current/static/arrays.html, querying an XML list in sql server using Xquery, Canât ensure that each value is the right data type: no way to prevent. Paul, I agree. Is there anyway to modify the above code so that I can get the following result? to check checkboxes in a list from driver table in least common scenario without having to go to another table to get them. With CSV: Plus a lot of comma characters. https://stackoverflow.com/questions/3653462/is-storing-a-delimited-list-in-a-database-column-really-that-bad/3653507#3653507, https://stackoverflow.com/questions/3653462/is-storing-a-delimited-list-in-a-database-column-really-that-bad/3653532#3653532, https://stackoverflow.com/questions/3653462/is-storing-a-delimited-list-in-a-database-column-really-that-bad/3653497#3653497. How do you clear a stringstream variable? Words from this list will be removed from file names while parsing for the title. Some more context, this is a small internal application that essentially replaces an Excel file that was stored on a shared folder. With CSV: Hard to search for all entities with a given value in the list; you have to use an inefficient table-scan. With CSV: Hard to count elements in the list, or do other aggregate queries. These are all symptoms of denormalized data, and highlight why you should always model for normalized data. Connect and share knowledge within a single location that is structured and easy to search. Second answer in the duplicate target also answers this question: Why do you guys always use std:: and full namespaces instead of using namespace? Transitional words and phrases at the beginnings of sentences move us from one thought, one sentence, to the next. @Paul: And maybe the same attitude will lead to him being hit by a bus when he fails to look both ways before crossing the street, but you haven't warned him about that. https://stackoverflow.com/questions/3653462/is-storing-a-delimited-list-in-a-database-column-really-that-bad/3653500#3653500. Is there specific reasoning for this? Why are elementwise additions much faster in separate loops than in a combined loop? – jrok Oct 14 '19 at 7 ... Why do "beer" and "cherry" have similar words in Spanish and Portuguese? Where is the line at which the producer of a product cannot be blamed for the stupidity of the user of that product? An ARRAY (of any datatype) can fix the exception, just check PostgreSQL: @CraigRinger, yes, it's a type of denormalization. No, it's a horrible idea. When used carefully, denormalization can be just the right thing to do for a certain query you are trying to optimize, but it must be done with full understanding that it harms other queries. But is it a good practice to have a method outside of a class? If those other queries aren't important to your application, then the pain is less. (Some users would dispute the statement in my previous paragraph, saying that "you can never know what requirements will be added in the future". Why are video calls so tiring? Input numbers are specified in a comma-separated list format, so we use the comma symbol in the input separator option. I just always find it as a very noisy and had-to-read syntax. I thought the saved time and simpler code was worth it in my situation, is this a defensible design choice, or should I have normalized it from the start?
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