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When and why are database joins expensive?
I'm doing some research into databases and I'm looking at some limitations of relational DBs.
7 Answers
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Swift equivalent for MIN and MAX macros
In C / Objective-C it is possible to find the minimum and maximum value between two numbers using MIN and MAX macros. Swift doesn't support macros and it seems that there are no equivalents in the language / base library. Should one go with a custom solution, maybe based on generics like this one ?...
ASP.NET MVC - Set custom IIdentity or IPrincipal
...to extend the default so that I can call something like User.Identity.Id and User.Identity.Role . Nothing fancy, just some extra properties.
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How do I deep copy a DateTime object?
Now $date1 and $date2 contain the same date -- three years from now. I'd like to create two separate datetimes, one which is parsed from a string and one with three years added to it. Currently I've hacked it up like this:
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Disable IntelliJ Starred (Package) Imports?
I'm a migrating Eclipse IDE user and am learning my way round IntelliJ IDEA 9.
3 Answers
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Drag and drop files into WPF
...ing you have one file that you care about, pass it off to whatever
// handling code you have defined.
HandleFileOpen(files[0]);
}
}
Also, don't forget to actually hook up the event in XAML, as well as setting the AllowDrop attribute.
<StackPanel Name="ImagePanel" Drop="ImagePanel_Dro...
Ninject vs Unity for DI [closed]
...re you limiting your choices to these two? I think Castle.Windsor, Autofac and StructureMap are at least as good or better.
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Spring get current ApplicationContext
... to avoid @Autowired due to some issues. Here is the link spring.io/understanding/application-context. The best option is to go with implementing the ApplicationContextAware interface.
– Durja Arai
Dec 24 '18 at 4:09
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Bash: Strip trailing linebreak from output
When I execute commands in Bash (or to be specific, wc -l < log.txt ), the output contains a linebreak after it. How do I get rid of it?
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Is memcached a dinosaur in comparison to Redis? [closed]
I have worked quite a bit with memcached the last weeks and just found out about Redis. When I read this part of their readme, I suddenly got a warm, cozy feeling in my stomach:
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