大约有 42,000 项符合查询结果（耗时：0.0735秒） [XML]
Setting an environment variable before a command in Bash is not working for the second command in a
In a given shell, normally I'd set a variable or variables and then run a command. Recently I learned about the concept of prepending a variable definition to a command:
...
find vs find_by vs where
...is used as a helper when you're searching for information within a column, and it maps to such with naming conventions. For instance, if you have a column named name in your database, you'd use the following syntax:
Model.find_by(name: "Bob")
.where is more of a catch all that lets you use a bit...
How to identify numpy types in python?
....g. numpy.ma.MaskedArray not a numpy enough type?
– panda-34
Mar 10 '16 at 13:02
If you want anything in numpy.* you j...
What is the difference between a route and resource in New Router API?
I am trying to understand the difference between a Route and a Resource . The way I understand Resource helps to set sub paths of a Route object to another Route Object. But its unclear when i think of default name mapping happening for paths as well.
...
Code snippet or shortcut to create a constructor in Visual Studio
...nly shows the intellisense box, then I have to type Tab once to close that and once to "use" the snippet), but might be some setting somewhere...
– Hans Olsson
Oct 6 '10 at 16:02
1...
Javascript calculate the day of the year (1 - 366)
...
Edit: The code above will fail when now is a date in between march 26th and October 29th andnow's time is before 1AM (eg 00:59:59). This is due to the code not taking daylight savings time into account. You should compensate for this:
var now = new Date();
var start = new Date(now.getFullY...
Tool to track #include dependencies [closed]
Any good suggestions? Input will be the name of a header file and output should be a list (preferably a tree) of all files including it directly or indirectly.
...
Rails ActiveRecord date between
I need to query comments made in one day. The field is part of the standard timestamps, is created_at . The selected date is coming from a date_select .
...
How to resolve : Can not find the tag library descriptor for “http://java.sun.com/jsp/jstl/core” [du
The Eclipse IDE is showing red underline and when I focus it the tag is : can not find the library descriptor for http://java.sun.com/jsp/jstl/core
...
How to solve PHP error 'Notice: Array to string conversion in…'
I have a PHP file that tries to echo a $_POST and I get an error, here is the code:
5 Answers
...