大约有 45,000 项符合查询结果（耗时：0.0351秒） [XML]
MySQL select 10 random rows from 600K rows fast
...d 2Gb size. See here my code: Fast selection of random rows in MySQL
<?php
$time= microtime_float();
$sql='SELECT COUNT(*) FROM pages';
$rquery= BD_Ejecutar($sql);
list($num_records)=mysql_fetch_row($rquery);
mysql_free_result($rquery);
$sql="SELECT id FROM pages WHERE RAND()*$num_records<2...
Comparing two byte arrays in .NET
...11 software license
// Ref: http://www.opensource.org/licenses/mit-license.php.
static unsafe bool UnsafeCompare(byte[] a1, byte[] a2) {
if(a1==a2) return true;
if(a1==null || a2==null || a1.Length!=a2.Length)
return false;
fixed (byte* p1=a1, p2=a2) {
byte* x1=p1, x2=p2;
int l = a...
How to write LDAP query to test if user is member of a group?
...ing to do what you say can not be done. How can I go about doing that with PHP? Is it possible to have the same result in another way? to find all groups start with SPS and then whatever... I can always grab everything and loop my array then preg match to the CN I want but I prefer just searching f...
How does one output bold text in Bash?
...e sequences for example here: ascii-table.com/ansi-escape-sequences-vt-100.php
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How to create “No Activate” form in Firemonkey
... := style or NSHUDWindowMask;
panel := TNSPanel.Wrap(
TNSPanel.Alloc.initWithContentRect(rect, style, NSBackingStoreBuffered,
true));
panel.setFloatingPanel(true);
//panel.setHasShadow(false); optional
window := WindowHandleToPlatform(form.Handle).Wnd;
panel.setC...
Heap vs Binary Search Tree (BST)
...le its size takes O(n) worst case, while the tree heap just does new small allocations for each node.
Still, the backing array doubling is O(1) amortized, so it comes down to a maximum latency consideration. Mentioned here.
Philosophy
BSTs maintain a global property between a parent and all desc...
How to append text to an existing file in Java?
...r }catch(IOException ex){ ex.printStackTrace(); }
– php_coder_3809625
Aug 18 '16 at 12:12
...
Intersection of two lists in Bash
... was awesome! I ran $ comm -12 <(git grep -il "\$this->error(" -- "*.php") <(git grep -il "Dash_Api_Json_Response" -- "*.php"), and luckily I ended up with the name of the file only that contained the trait.
– localheinz
Apr 7 '17 at 15:45
...
Removing the title text of an iOS UIBarButtonItem
...:
Objective-C:
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:self.navigationItem.backBarButtonItem.style target:nil action:nil];
Swift:
navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
To be clear...
What are the implications of using “!important” in CSS? [duplicate]
...ause thats a not operator in javascript but in css it's called a delimiter token that just says to take priority. Heres an example.
Without !important:
.set-color{
color: blue;
}
.set-color{
color: red;
}
outputs RED
!important on bottom attribute (of same)
.set-color{
color: blu...