大约有 40,000 项符合查询结果（耗时：0.0405秒） [XML]
Generating random strings with T-SQL
...mple of a function that generates object names in a reproducible manner:
alter procedure usp_generateIdentifier
@minLen int = 1
, @maxLen int = 256
, @seed int output
, @string varchar(8000) output
as
begin
set nocount on;
declare @length int;
declare @alpha varchar(8000...
Solutions for INSERT OR UPDATE on SQL Server
...mance is good, but simple (IF EXISTS..) approach is very dangerous.
When multiple threads will try to perform Insert-or-update you can easily
get primary key violation.
Solutions provided by @Beau Crawford & @Esteban show general idea but error-prone.
To avoid deadlocks and PK violations you ...
Open file dialog and select a file using WPF controls and C#
...OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
// Set filter for file extension and default file extension
dlg.DefaultExt = ".png";
dlg.Filter = "JPEG Files (*.jpeg)|*.jpeg|PNG Files (*.png)|*.png|JPG Files (*.jpg)|*.jpg|GIF Files (*.gif)|*.gif";
// Display OpenFil...
OO Design in Rails: Where to put stuff
...ses where you have categories of functionality that you wish to reuse in multiple classes, but where the functionality is still notionally attached to the classes.
Remember, when you include a module into a class, the methods become instance methods of the class, so you still end up with a class co...
What are the correct version numbers for C#?
...emented properties, using directives to import static members, exception filters, element initializers, await in catch and finally, extension Add methods in collection initializers.
C# 7.0 released with .NET 4.7 and VS2017 (March 2017). Major new features: tuples, ref locals and ref return, pattern ...
Set default CRAN mirror permanent in R
...s(repos=structure(c(CRAN="YOUR FAVORITE MIRROR")))
to your .Rprofile
Alternatively, you can set the mirror site-wide in your Rprofile.site. The location of the file is given by ?Startup:
The
path of this file is taken from the value of the R_PROFILE
environment variable (after...
Android map v2 zoom to show all the markers
...cation 2
One comment notes that using this method for only one marker results in map zoom set to a "bizarre" zoom level (which I believe to be maximum zoom level available for given location). I think this is expected because:
The LatLngBounds bounds instance will have northeast property equal to...
Creating a DateTime in a specific Time Zone in c#
...ne);
this.timeZone = timeZone;
}
public DateTime UniversalTime { get { return utcDateTime; } }
public TimeZoneInfo TimeZone { get { return timeZone; } }
public DateTime LocalTime
{
get
{
return TimeZoneInfo.ConvertTime(utcDateTime, timeZ...
Force git stash to overwrite added files
...in the working directory that should be kept, here is a less heavy-handed alternative:
$ git merge --squash --strategy-option=theirs stash
If there are changes in the index, or the merge will touch files with local changes, git will refuse to merge. Individual files can be checked out from the st...
Deleting Files using Git/GitHub
... @KimPrince - According to kernel.org, "-A --all Like -u, but match <filepattern> against files in the working tree in addition to the index. That means that it will find new files as well as staging modified content and removing files that are no longer in the working tree."
...