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尝试加载 Oracle 客户端库时引发 BadImageFormatException。如果在安装 32 ...
本帖最后由 zqp2013 于 2015-4-23 09:59 编辑
尝试加载 Oracle 客户端库时引发 BadImageFormatException。如果在安装 32 位 Oracle 客户端组件的情况下以 64 位模式运行，将出现此问题。
Meaning of = delete after function declaration
... class in a hierarchy is typically
a disaster: given only a pointer to a base, we simply don’t know what
members the derived class has, so we can’t know how to copy
them. So, the best thing to do is usually to delete the default copy
and move operations, that is, to eliminate the default...
How many random elements before MD5 produces collisions?
...n separate directories. I use this to store user files in separate folders based on their user ID in S3.
For example: "mybucket/users/1234/somefile.jpg". It's not exactly the same as a directory in a file system, but the S3 API has some features that let it work almost the same. I can ask it to li...
How to get all possible combinations of a list’s elements?
... tuple(sorted(Counter(...).elements())) if you need it to be hashable)
Demo
>>> list(combinations(range(4)))
[set(), {3}, {2}, {2, 3}, {1}, {1, 3}, {1, 2}, {1, 2, 3}, {0}, {0, 3}, {0, 2}, {0, 2, 3}, {0, 1}, {0, 1, 3}, {0, 1, 2}, {0, 1, 2, 3}]
>>> list(combinations('abcd'))
[s...
Skip certain tables with mysqldump
... Tested and used under MySQL 5.5.43 (for debian-linux-gnu (x86_64)) Thanks
– Abdel
Jul 17 '15 at 8:54
...
Array.Copy vs Buffer.BlockCopy
...
Since the parameters to Buffer.BlockCopy are byte-based rather than index-based, you're more likely to screw up your code than if you use Array.Copy, so I would only use Buffer.BlockCopy in a performance-critical section of my code.
...
How to make MySQL handle UTF-8 properly
... @Kevin I think you misread that. I think the maximum row length is 64k. You can only make a utf8mb4 field 1/4 of that because it had to reserve that amount of space. So, even if it's ASCII you can only insert 16k characters.
– Tim Tisdall
Oct 22 '14 a...
How do I replace NA values with zeros in an R dataframe?
...
The dplyr hybridized options are now around 30% faster than the Base R subset reassigns. On a 100M datapoint dataframe mutate_all(~replace(., is.na(.), 0)) runs a half a second faster than the base R d[is.na(d)] <- 0 option. What one wants to avoid specifically is using an ifelse() or ...
Programmatically get own phone number in iOS
... What's the best reason you have seen for Apple disallowing permission-based access to the user's phone number? Apple already allows permission-based access to contacts, photos, location, and the user's camera and microphone. Why not the phone number? There must be a good reason, but it's not im...
What is the difference between Numpy's array() and asarray() functions?
...be
passed-through, otherwise the returned array will be forced to be a
base-class array (default).
ndmin : int, optional Specifies the minimum number of dimensions that
the resulting array should have. Ones will be pre-pended to the shape
as needed to meet this requirement.
...