大约有 12,000 项符合查询结果（耗时：0.0236秒） [XML]
Why does PostgreSQL perform sequential scan on indexed column?
Very simple example - one table, one index, one query:
4 Answers
4
...
How to replace an item in an array with Javascript?
...
var index = items.indexOf(3452);
if (index !== -1) {
items[index] = 1010;
}
Also it is recommend you not use the constructor method to initialize your arrays. Instead, use the literal syntax:
var items = [523, 3452, 334, ...
One-liner to recursively list directories in Ruby?
...
In PHP or other languages to get the content of a directory and all its subdirectories, you have to write some lines of code, but in Ruby it takes 2 lines:
require 'find'
Find.find('./') do |f| p f end
this will print the con...
Does java.util.List.isEmpty() check if the list itself is null? [duplicate]
...I deleted my stupid comment, before I saw your answer. Maybe he comes from PHP where we have !empty($foo) as somewhat an alias for isset($foo) && $foo != "".
– Aufziehvogel
Jul 16 '12 at 20:39
...
Auto increment in phpmyadmin
I have an existing database using PHP, MySQL and phpMyAdmin.
9 Answers
9
...
#1071 - Specified key was too long; max key length is 1000 bytes
...
As @Devart says, the total length of your index is too long.
The short answer is that you shouldn't be indexing such long VARCHAR columns anyway, because the index will be very bulky and inefficient.
The best practice is to use prefix indexes so you're only indexin...
Call a Server-side Method on a Resource in a RESTful Way
...of REST is the use of HATEOAS - I don't brush it here, but I talk about it quickly at another post.)
Issues of the first design
Let's take a look a the proposed design:
ACTION http://api.animals.com/v1/dogs/1/
First off, we should not consider creating a new HTTP verb (ACTION). Generally spea...
How to check if an element is in an array
...w to check for this? I know that there is a method find that returns the index number, but is there a method that returns a boolean like ruby's #include? ?
...
How do I expand a tuple into variadic template function's arguments?
...o a variadic template function. Here is a small helper class which creates index array. It is used a lot in template metaprogramming:
// ------------- UTILITY---------------
template<int...> struct index_tuple{};
template<int I, typename IndexTuple, typename... Types>
struct make_ind...
How do I show the changes which have been staged?
...just be:
git diff --cached
--cached means show the changes in the cache/index (i.e. staged changes) against the current HEAD. --staged is a synonym for --cached.
--staged and --cached does not point to HEAD, just difference with respect to HEAD. If you cherry pick what to commit using git add --...