大约有 5,500 项符合查询结果（耗时：0.0197秒） [XML]
How to initialize a List to a given size (as opposed to capacity)?
...ow when needed ?
When you do this:
List<int> = new List<int>(100);
You create a list whose capacity is 100 integers. This means that your List won't need to 'grow' until you add the 101th item.
The underlying array of the list will be initialized with a length of 100.
...
Format number to 2 decimal places
...en you should fix it. I will still get useful for everyone, and it will be 100% correct. Win-win :)
– Benoit Duffez
Dec 22 '14 at 9:21
|
sho...
Fast way to discover the row count of a table in PostgreSQL
...ists in a given schema
TABLESAMPLE SYSTEM (n) in Postgres 9.5+
SELECT 100 * count(*) AS estimate FROM mytable TABLESAMPLE SYSTEM (1);
Like @a_horse commented, the newly added clause for the SELECT command might be useful if statistics in pg_class are not current enough for some reason. For ex...
How can I add new keys to a dictionary?
...oo': 'bar'}
>>> def f():
... d = {}
... for i in xrange(100):
... d['foo'] = i
...
>>> def g():
... d = {}
... for i in xrange(100):
... d.__setitem__('foo', i)
...
>>> import timeit
>>> number = 100
>>> min(timeit.repe...
How to do a SOAP Web Service call from Java class?
...CelsiusToFahrenheit>
<myNamespace:Celsius>100</myNamespace:Celsius>
</myNamespace:CelsiusToFahrenheit>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
*/
// SOAP Body
SOAPBody ...
How do you get centered content using Twitter Bootstrap?
...y-auto. This will center the element within it's container. For example, h-100 makes the row full height, and my-auto will vertically center the col-sm-12 column.
<div class="row h-100">
<div class="col-sm-12 my-auto">
<div class="card card-block w-25">Card</div>...
Why is require_once so bad to use?
....046600103378296
require_once 1.2219581604004 3.2908599376678
10-100× slower with require_once and it's curious that require_once is seemingly slower in hhvm. Again, this is only relevant to your code if you're running *_once thousands of times.
<?php // test.php
$LIMIT = 1000000;
...
How to initialise memory with new operator in C++?
... You can allocate and default-initialize in one step, like this:
int vals[100] = {0}; // first element is a matter of style
2) use memset(). Note that if the object you are allocating is not a POD, memsetting it is a bad idea. One specific example is if you memset a class that has virtual func...
Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
... a query with 4 joins on a 168,000 row database. Selecting just the first 100 rows with a SQL_CALC_FOUND_ROWS took over 20 seconds; using a separate COUNT(*) query took under 5 seconds (for both count + results queries).
– Sam Dufel
Jul 11 '12 at 23:59
...
How does Facebook Sharer select Images and other metadata when sharing my URL?
...t;a class="btn" target="_blank" href="http://www.facebook.com/sharer.php?s=100&amp;p[title]=<?php echo urlencode(YOUR_TITLE);?>&amp;p[summary]=<?php echo urlencode(YOUR_PAGE_DESCRIPTION) ?>&amp;p[url]=<?php echo urlencode(YOUR_PAGE_URL); ?>&amp;p[images][0]=<?php...