大约有 40,000 项符合查询结果（耗时：0.0480秒） [XML]
PostgreSQL: Difference between text and varchar (character varying)
...
There is no difference, under the hood it's all varlena (variable length array).
Check this article from Depesz: http://www.depesz.com/index.php/2010/03/02/charx-vs-varcharx-vs-varchar-vs-text/
A couple of highlights:
To sum it all up:
char(n) – takes t...
jQuery $(document).ready and UpdatePanels?
...
$(document).ready(function() {
// bind your jQuery events here initially
});
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_endRequest(function() {
// re-bind your jQuery events here
});
The PageRequestManager is a javascript object which is automatically available i...
If vs. Switch Speed
Switch statements are typically faster than equivalent if-else-if statements (as e.g. descibed in this article ) due to compiler optimizations.
...
What's the difference between git reflog and log?
...eline --graph --decorate.)
git reflog doesn't traverse HEAD's ancestry at all. The reflog is an ordered list of the commits that HEAD has pointed to: it's undo history for your repo. The reflog isn't part of the repo itself (it's stored separately to the commits themselves) and isn't included in pu...
@RunWith(MockitoJUnitRunner.class) vs MockitoAnnotations.initMocks(this)
...automatic initMocks().
The automatic validation of framework usage is actually worth having. It gives you better reporting if you make one of these mistakes.
You call the static when method, but don't complete the stubbing with a matching thenReturn, thenThrow or then. (Error 1 in the code bel...
BackgroundWorker vs background Thread
...ome way (and is it better) to thread.Join the background worker until it really does exit and then let the Dispose of the form continue?
– freddy smith
Oct 1 '09 at 23:46
...
Could not load file or assembly 'xxx' or one of its dependencies. An attempt was made to load a prog
...ss Objects 4 for .Net SDK.
They ship five BusinessObjects*.dll files, but all of them are 64-bit.
To get my webpage to load, I needed to click on Tools\Options, then change this setting in VS2013:
share
|
...
HtmlString vs. MvcHtmlString
HtmlString vs. MvcHtmlString
3 Answers
3
...
Collections.emptyMap() vs new HashMap()
...need to explicitly type out the generic type of the collection - it's generally just inferred from the context of the method call.
They're more efficient because they don't bother creating new objects; they just re-use an existing empty and immutable object. This effect is generally very minor, b...
Linq to Entities join vs groupjoin
...groups. This can be turned into a flat list of parent-child pairs by two small additions:
from p in parents
join c in children on p.Id equals c.Id into g // <= into
from c in g.DefaultIfEmpty() // <= flattens the groups
select new { Parent = p.Value, Child = c?.ChildValue }
The ...