大约有 3,285 项符合查询结果（耗时：0.0301秒） [XML]
How to retrieve the current value of an oracle sequence without increment it?
... that sequence as Primary Key. My assumption was that CURRVAL would be the fastest method. But a) CurrVal does not work, it will just get the old value because you are in another Oracle session, until you do a NEXTVAL in your own session. And b) a select max(PK) from TheTable is also very fast, prob...
Swift Beta performance: sorting arrays
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tl;dr Swift 1.0 is now as fast as C by this benchmark using the default release optimisation level [-O].
Here is an in-place quicksort in Swift Beta:
func quicksort_swift(inout a:CInt[], start:Int, end:Int) {
if (end - start < 2){
r...
What integer hash function are good that accepts an integer hash key?
...no collisions (each input results in a different output). The algorithm is fast except if the CPU doesn't have a built-in integer multiplication unit. C code, assuming int is 32 bit (for Java, replace >> with >>> and remove unsigned):
unsigned int hash(unsigned int x) {
x = ((x &...
When to use Hadoop, HBase, Hive and Pig?
... Hadoop Vs Cassandra/HBase read this post.
Basically HBase enables really fast read and writes with scalability. How fast and scalable? Facebook uses it to manage its user statuses, photos, chat messages etc. HBase is so fast sometimes stacks have been developed by Facebook to use HBase as the data...
How can I get the source code of a Python function?
...+ arg2
... return a
...
>>> dis.dis(foo)
3 0 LOAD_FAST 0 (arg1)
3 LOAD_FAST 1 (arg2)
6 BINARY_ADD
7 STORE_FAST 2 (a)
4 10 LOAD_FAST 2 (a)
13 RETURN_V...
Accessing class variables from a list comprehension in the class definition
...UNCTION 2 (2 positional, 0 keyword pair)
16 STORE_FAST 0 (Foo)
5 19 LOAD_FAST 0 (Foo)
22 RETURN_VALUE
The first LOAD_CONST there loads a code object for the Foo class body, then makes that into a function, an...
How can I increase the cursor speed in terminal? [closed]
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More detail from the article:
Everybody knows that you can get a pretty fast keyboard repeat rate by changing a slider on the Keyboard tab of the Keyboard & Mouse System Preferences panel. But you can make it even faster! In Terminal, run this command:
defaults write NSGlobalDomain KeyRepeat ...
How to recursively find and list the latest modified files in a directory with subdirectories and ti
...tat --format '%Y :%y %n' | sort -nr | cut -d: -f2- | head
which is a bit faster.
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any tool for java object to object mapping? [closed]
...d, and a good option is to use MapStruct, it's easy (support annotations), fast (no reflection) and seems secure (at the moment). This is included in the @Pascal Thivent list although, but I advise it (even if I had some problems by using it along with lombok).
– Alex
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How do you echo a 4-digit Unicode character in Bash?
...al Bash implementation, no forking, unlimited size of Unicode characters.
fast_chr() {
local __octal
local __char
printf -v __octal '%03o' $1
printf -v __char \\$__octal
REPLY=$__char
}
function unichr {
local c=$1 # Ordinal of char
local l=0 # Byte ctr
local ...