大约有 40,000 项符合查询结果（耗时：0.0572秒） [XML]
How to count instances of character in SQL Column
...
@StevenWhite DATALENGTH returns number of bytes used. So NVARCHAR will be doubled.
– domenicr
Nov 20 '15 at 20:54
|
...
Get all table names of a particular database by SQL query?
I am working on application which can deal with multiple database servers like "MySQL" and "MS SQL Server".
19 Answers
...
Mipmap drawables for icons
...ity. For example on an hdpi tablet the launcher might load the xhdpi icon. By placing your launcher icon in the mipmap-xhdpi directory, it will not be stripped the way a drawable-xhdpi directory is when building an APK for hdpi devices. If you're building a single APK for all devices, then this does...
how to find host name from IP with out login to the host
...npage:
Reverse lookups -- mapping addresses to names -- are simplified by the
-x option. addr is an IPv4 address in dotted-decimal notation, or a colon-delimited IPv6 address. When this option is used, there is no
need to provide the name, class and type arguments. dig automatically
perf...
What is the difference between encrypting and signing in asymmetric encryption?
... your public key itself, which you have earlier generated for free, signed by an authority which might or might not charge you money for that.
– Quassnoi
Jul 26 '19 at 10:45
...
UIPopovercontroller dealloc reached while popover is still visible
...en you don't need to keep a reference to the popover because it is managed by the presentation controller.
Code example (works both on iPhone and iPad):
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSour...
http HEAD vs GET performance
... or is slow to retrieve at the server, you might not see a measurable gain by using HEAD instead of GET. It could be that retrieving the meta data is not any faster than retrieving the entire resource.
You could implement both options and benchmark them to see which is faster, but rather than micro...
How can I style an Android Switch?
The switch widget introduced in API 14 is styled by default with holo theme.
I want to style it slightly different, changing its colors and shape a bit for branding reasons. How does one go about this? I know it must be possible, as ive seen the difference between default ICS and Samsung's touchwiz ...
Why use Abstract Base Classes in Python?
...rs.
In a staticly-typed language, that contract would actually be enforced by the compiler. In Python, you can use EAFP or type introspection to confirm that the unknown object meets this expected contract.
But there are also higher-level, semantic promises in the contract.
For example, if there is ...
Slowing speed of Viewpager controller in android
...rtant method (smoothScrollTo) can't be overridden.
I ended up fixing this by extending Scroller with this code:
public class FixedSpeedScroller extends Scroller {
private int mDuration = 5000;
public FixedSpeedScroller(Context context) {
super(context);
}
public FixedSpe...