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Spring MVC: How to perform validation?
...have a null name, result.hasErrors() will be true.
Method 2 : If you have complex validation (like big business validation logic, conditional validation across multiple fields, etc.), or for some reason you cannot use method 1, use manual validation. It is a good practice to separate the controller...
#pragma once vs include guards? [duplicate]
I'm working on a codebase that is known to only run on windows and be compiled under Visual Studio (it integrates tightly with excel so it's not going anywhere). I'm wondering if I should go with the traditional include guards or use #pragma once for our code. I would think letting the compiler de...
How can I declare and use Boolean variables in a shell script?
...l not to fall off!'
fi
Original Answer
Caveats: https://stackoverflow.com/a/21210966/89391
the_world_is_flat=true
# ...do something interesting...
if $the_world_is_flat ; then
echo 'Be careful not to fall off!'
fi
From: Using boolean variables in Bash
The reason the original answer is i...
Create the perfect JPA entity [closed]
...write this down for personal use.
I would not mind however for anyone to comment on it or to tell me where I'm wrong.
4 A...
Arrays, heap and stack and value types
...
LOL, always the nit-picker, Mr. Lippert. :) I feel compelled to point out that with the exception of your latter two cases, the so-called "locals" cease to be locals at compile time. The implementation raises them to the status of class members, which is the only reason they...
Domain Driven Design: Domain Service, Application Service
...
Services come in 3 flavours: Domain Services, Application Services, and Infrastructure Services.
Domain Services : Encapsulates
business logic that doesn't naturally
fit within a domain object, and are NOT typical CRUD operations ...
移动前端开发之viewport的深入理解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...设备ideal viewport的宽度都为多少，可以到http://viewportsizes.com去查看一下，里面收集了众多设备的理想宽度。
再总结一下：ppk把移动设备上的viewport分为layout viewport 、 visual viewport 和 ideal viewport 三类，其中的ideal viewport是最...
When should I use RequestFactory vs GWT-RPC?
...orks quite well until you wind up wanting to have server-specific, non-GWT-compatible, code inside your class. Because the RPC system is based on having the same concrete type on both the client and the server, you can hit a complexity wall based on the capabilities of your GWT client.
To get arou...
What are the differences between a pointer variable and a reference variable in C++?
...s heap. This implies that there is a real address of a reference that the compiler will not tell you.
int x = 0;
int &r = x;
int *p = &x;
int *p2 = &r;
assert(p == p2);
You can have pointers to pointers to pointers offering extra levels of indirection. Whereas references only offer ...