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nvarchar和varchar相互转换、联合查询 - ORACLE - 清泛IT论坛，有思想、有深度
...fying the USING CHAR_CS argument converts text into the database character set. The output datatype is VARCHAR2.
Specifying the USING NCHAR_CS argument converts text into the national character set. The output datatype is NVARCHAR2.
（A表字段c_xxx:varchar，B表c_xxx:nvarchar）
select tran...
Python str vs unicode types
...hold Unicode strings. Is there any special reason apart from being able to set Unicode codes in unicode strings using the escape char \ ?:
...
CSS - How to Style a Selected Radio Buttons Label?
...type="radio"]:checked ~ * {
background:pink !important;
}
That will set the backgrounds for all siblings of the selected radio button.
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C state-machine design [closed]
...t_state)
{
case ST_NEW:
/* Do something with input and set current_state */
break;
case ST_OPEN:
/* Do something different and set current_state */
break;
/* ... etc ... */
}
}
I would use this when the state machine is simple enoug...
What is the theoretical maximum number of open TCP connections that a modern Linux box can have
... to keep the state of all those connections, and I think you would have to set up some iptables rules to keep the kernel TCP stack from getting upset &/or responding on your behalf.
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How can I reset a react component including all transitively reachable state?
...lly have react components that are conceptually stateful which I want to reset. The ideal behavior would be equivalent to removing the old component and readding a new, pristine component.
...
URL-parameters and logic in Django class-based views (TemplateView)
...elf.kwargs):
class MyClassBasedView(ObjectList):
...
def get_queryset(self):
order_by = self.request.GET.get('order_by') or '-created'
qs = super(MyClassBasedView, self).get_queryset()
return qs.order_by(order_by)
...
How does grep run so fast?
...g character.
GNU grep also unrolls the inner loop of Boyer-Moore, and sets up the
Boyer-Moore delta table entries in such a way that it doesn't need to
do the loop exit test at every unrolled step. The result of this is
that, in the limit, GNU grep averages fewer than 3 x86 instructions
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Show pop-ups the most elegant way
...
Angular-ui comes with dialog directive.Use it and set templateurl to whatever page you want to include.That is the most elegant way and i have used it in my project as well.
You can pass several other parameters for dialog as per need.
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How do you iterate through every file/directory recursively in standard C++?
...FIND_DATA.dwFileAttributes to check if the FILE_ATTRIBUTE_DIRECTORY bit is set. If the bit is set then you can recursively call the function with that directory. Alternatively you can use a stack for providing the same effect of a recursive call but avoiding stack overflow for very long path trees.
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