大约有 44,956 项符合查询结果（耗时：0.0613秒） [XML]
Check if image exists on server using JavaScript?
...
Function is awesome. I put it in my collection :) I thought fileExists would be better name because this function does not check if image exists on server. It check if file is accessible from server. There is no check if that file actually is an image....
Generate random numbers using C++11 random library
As the title suggests, I am trying to figure out a way of generating random numbers using the new C++11 <random> library. I have tried it with this code:
...
JPA getSingleResult() or null
I have an insertOrUpdate method which inserts an Entity when it doesn't exist or update it if it does. To enable this, I have to findByIdAndForeignKey , if it returned null insert if not then update. The problem is how do I check if it exists? So I tried getSingleResult . But it throws an ex...
How to set HTTP header to UTF-8 using PHP which is valid in W3C validator?
I have several PHP pages echoing out various things into HTML pages with the following code.
6 Answers
...
Grab a segment of an array in Java without creating a new array on heap
...is worthy of deletion. The answer by @unique72 is correct. Imma let this edit sit for a bit and then I shall delete this answer.)
I don't know of a way to do this directly with arrays without additional heap allocation, but the other answers using a sub-list wrapper have additional allocation fo...
How do I capture the output of a script if it is being ran by the task scheduler?
...008, how do I go about capturing the output of a script that is being ran with the windows task scheduler?
9 Answers
...
Django 1.7 - makemigrations not detecting changes
As the title says, I can't seem to get migrations working.
29 Answers
29
...
Easy way to dismiss keyboard?
I have quite a few controls scattered throughout many table cells in my table, and I was wondering if there's an easier way to dismiss the keyboard without having to loop through all my controls and resigning them all as the first responder. I guess the question is.. How would I get the current firs...
You can't specify target table for update in FROM clause
...e problem is that MySQL, for whatever inane reason, doesn't allow you to write queries like this:
UPDATE myTable
SET myTable.A =
(
SELECT B
FROM myTable
INNER JOIN ...
)
That is, if you're doing an UPDATE/INSERT/DELETE on a table, you can't reference that table in an inner query (you ...
How to implement Enums in Ruby?
... (FOO notation).
Symbols are appropriate when you want to enhance readability without littering code with literal strings.
postal_code[:minnesota] = "MN"
postal_code[:new_york] = "NY"
Constants are appropriate when you have an underlying value that is important. Just declare a module to hold you...