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Tx 
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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Slacker007 wrote: Just saw a demo online a few days ago, and the "demo guys" were having trouble with some areas with code first, and they were the "experts".
Can you share the link?
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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My buddy has it. Will post back with it when I get it. I watched part of the vid clip on his machine, not mine.
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If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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Learn ASP.NET Online – Microsoft Virtual Academy[^]
Under "Creating and configuring models" --> Creating models --> around 23:40 but start at around 22:00 to get some intro context.
I heard that the SNAFU they had during the demo happens a lot to people, especially those who are trying to get up to speed with "code first".
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Thank you! Will take a look..
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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For my limited experience, what i can tell either way you got to adjust the side you started first.
Even with a virtual Database you'll reach the point where you just transferred it and finished the db, then someone is asking for another field. Or at what point you say the app is ready and you can start to set up the Database?
I started DB first, adjusted the programm, then the db, then both and so on. Seems like somethings never "finish".
Rules for the FOSW ![ ^]
if(this.signature != "")
{
MessageBox.Show("This is my signature: " + Environment.NewLine + signature);
}
else
{
MessageBox.Show("404-Signature not found");
}
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Spec First, before any of these
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Avijnata wrote:
That goes without saying.
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Slacker007 wrote: That goes without saying.
Not sure whether this is true. In more than 50 percent of the cases.
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Avijnata wrote: In more than 50 percent of the cases.
You have done statistical analysis on this? 
I have never worked for a software shop that did not require specs. I'm sure they are out there...50% of the time, at least.
-- just teasing you.
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Programmers rarely think correctly in terms of relationships between objects when they do code first. They're usually thinking in terms of denormalized data. Certainly, I do, because it's the denormalized data that I usually want to display to the user.
So, that's the first problem with code first.
Programmers are typically not very good at figuring out normalization and the nuances of left joins, right joins, one-to-many and many-to-many relationships, at least as to how you'd implement them in a DB. Sure, the code first stuff should be able to generate the lookup tables if you define the relationship ordinality correctly, but as others have written, I'd rather have direct control.
Even DB people make a mess of relationships.
Lastly, there's a weird reality that I can define a decent normalized database, but when I go to use it in the code, I realize that I screwed up understanding some relationship that I thought I understood when creating the DB, but I realize I got wrong when I go actually trying to use it based on the requirements. It's weird that that can happen, but it does, at least in my experience.
[tldr:]
Neither code first nor database first is the correct approach. It needs to be "code and database together." And code first does NOT get you there.
Marc
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Thanks for your feedback. I appreciate it. 
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For me, it depends on database use. If the database is going to be highly transactional, I would start with the database as the Entity framework won't optimize table structures and indexes like building it by hand would. If it is just a data store, then start with the app first so you can focus on the presentation layer.
if (Object.DividedByZero == true) { Universe.Implode(); }
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Never liked the code first approach.
I'm currently working on a project where it used to be code first, so the database was created by code. (due to external factors we now have database first, but that's to long to explain)
Whoever did it messed up royally.
- Many to many relationships where there should be one to many.
- Tables that just don't make sense.
- Overly complicated structures.
- Datatypes that just don't make sense.
- Missing foreign keys.
- ...
It's a major pain to work with it now (even with database first) due to those things, unfortunately the database can't be changed anymore so I'm stuck with it (some things I can still fix but most I can't, not without rewriting a major part off the code).
About 30% of the tables in that db shouldn't even exist so...
If you'r going code first make sure you have a good handle on it because if done wrong it can be a nightmare to work with.
Tom
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Tom Deketelaere wrote: If you'r going code first make sure you have a good handle on it because if done wrong it can be a nightmare to work with.
This is a real concern for us, as well. Thanks for the feedback.
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that will be 5 concurrent users before the crash.
it ain’t broke, it doesn’t have enough features yet.
modified 20-Oct-19 21:02pm.
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Interesting.
Unfortunately, the world I live in revolves around "what can you give me in a certain time frame?". This does not lend itself well to theoretical software development, or hobby craft, where it may or may not work.
Now, after a few years, and it has moved from philosophy into mainstream practice, then I would consider adopting. --> You used the phrase "may free us", in your linked page article, which has a certain level of uncertainty to me, hence the tone of my reply. 
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Some industries (financial services, mobile phone billing etc.) are already using this model.
Unfortunately the code we/they use is very proprietary and this kind of thing is not used in college courses (yet).
Commercial offerings do exist - in particular Event Store[^]
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I'm working on a project right now and we used Code First.
There's some nice stuff about it if you keep your database simple, but what database ever ends up being simple, right? Stuff like Migrations can make changes very easy to implement but others a real pain in the ass.
If you've got a very small team, like under 5 people, Migrations can be easy to manage. If not, it can be a huge pain. It's probably best to keep the Migrations limited to just a few people on the team until the database is fleshed out. Multiple people putting in migrations on the same table at the same time can make your life miserable. We ran into a couple of problems like this and I'm one of two people working on this project. If you're going to have multiple people doing Migrations coordination of those changes is paramount. I can't stress that enough. If you want to avoid problems, you have to make sure no two people are making changes to the same table at the same time.
You REALLY have to understand your data and how relationships work before you even think of starting with Code First. Code First isn't the best when determining how it's going to setup a relationship and you really have to know your DB stuff to make sure it's getting it correct.
When Code First doesn't get a relationship correct or exactly the way you want it there is a rather steep learning curve to the syntax to configure it correctly and it only gets steeper if you don't know enough of the detail of how the database side works and the terminology involved.
Would I use Code First again? Sure, but not for large projects. I'd keep it to smaller ones only.
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I like it. Different from DB first, but the automatic db intialization is neat.
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