大约有 40,000 项符合查询结果（耗时：0.0426秒） [XML]
Postgres: INSERT if does not exist already
...modifies the table such that more columns are unique. In that case all the scripts must be modified. It would be nice if there was a more generic way to do this...
– Willem Van Onsem
Aug 1 '14 at 13:17
...
How to get Ruby / Homebrew / RVM to work on Yosemite?
...
Editing the script means brew update won't work; there are local edits to tracked files which causes the git pull to fail.
I did this, which I suspect is cleaner:
cd /usr/local/Library
git pull -q origin refs/heads/master:refs/remotes/...
How can I see the SQL that will be generated by a given ActiveRecord query in Ruby on Rails
...
This is what I usually do to get SQL generated in console
-> script/console
Loading development environment (Rails 2.1.2)
>> ActiveRecord::Base.logger = Logger.new STDOUT
>> Event.first
You have to do this when you first start the console, if you do this after you have ty...
Pass array to mvc Action via AJAX
...$.param() method serializes deep objects recursively to accommodate modern scripting languages and frameworks such as PHP and Ruby on Rails. You can disable this functionality globally by setting jQuery.ajaxSettings.traditional = true;
– Alexey Shevelyov
Nov 4 ...
Difference between Mock / Stub / Spy in Spock test framework
... replacing a real one, returning something like null or 0 for each method call. You use a mock if you need a dummy instance of a complex class which would otherwise use external resources like network connections, files or databases or maybe use dozens of other objects. The advantage of mocks is tha...
How do I dynamically assign properties to an object in TypeScript?
If I wanted to programatically assign a property to an object in Javascript, I would do it like this:
23 Answers
...
Are tuples more efficient than lists in Python?
...l be more like the tuple example above than the list example, but do you really believe that means performance will be similar?
– mzz
Jan 31 '10 at 15:21
...
What does the exclamation mark mean in a Haskell declaration?
...
It's a strictness declaration. Basically, it means that it must be evaluated to what's called "weak head normal form" when the data structure value is created. Let's look at an example, so that we can see just what this means:
data Foo = Foo Int Int !Int !(May...
What characters are allowed in DOM IDs? [duplicate]
...
Actually there is a difference between HTML and XHTML.
As XHTML is XML the rules for XML IDs apply:
Values of type ID MUST match the Name production.
NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] |
...
Double vs. BigDecimal?
...tudes (say d1=1000.0 and d2=0.001) could result in the 0.001 being dropped alltogether when summing as the difference in magnitude is so large. With BigDecimal this would not happen.
The disadvantage of BigDecimal is that it's slower, and it's a bit more difficult to program algorithms that way (du...