大约有 48,000 项符合查询结果（耗时：0.0489秒） [XML]
Rails: How to list database tables/objects using the Rails console?
...
You are probably seeking:
ActiveRecord::Base.connection.tables
and
ActiveRecord::Base.connection.columns('projects').map(&:name)
You should probably wrap them in shorter syntax inside your .irbrc.
share
...
Retrieve the maximum length of a VARCHAR column in SQL Server
...
Use the built-in functions for length and max on the description column:
SELECT MAX(LEN(DESC)) FROM table_name;
Note that if your table is very large, there can be performance issues.
...
How to rsync only a specific list of files?
...'re looking for a specific list of files, putting them directly on the command line instead:
# rsync -avP -e ssh `cat deploy/rsync_include.txt` root@0.0.0.0:/var/www/
This is assuming, however, that your list isn't so long that the command line length will be a problem and that the rsync_include....
Get a random item from a JavaScript array [duplicate]
How do I get random item from items ?
13 Answers
13
...
How do I find an element that contains specific text in Selenium Webdriver (Python)?
...omplicated javascript interface with Selenium (using the Python interface, and across multiple browsers). I have a number of buttons of the form:
...
What is the best algorithm for overriding GetHashCode?
...he implementation given in Josh Bloch's fabulous Effective Java. It's fast and creates a pretty good hash which is unlikely to cause collisions. Pick two different prime numbers, e.g. 17 and 23, and do:
public override int GetHashCode()
{
unchecked // Overflow is fine, just wrap
{
i...
Requests — how to tell if you're getting a 404
I'm using the Requests library and accessing a website to gather data from it with the following code:
1 Answer
...
Handler “ExtensionlessUrlHandler-Integrated-4.0” has a bad module “ManagedPipelineHandler” in its mo
To be honest, I've tried to turn a dirty trick on IIS and just when I thought that I was going to get away with it, I realized my workaround doesn't work. Here's what I've tried to do:
...
Difference between IsNullOrEmpty and IsNullOrWhiteSpace in C# [duplicate]
What are differences between these commands in C#
8 Answers
8
...
How to read a file line-by-line into a list?
How do I read every line of a file in Python and store each line as an element in a list?
28 Answers
...