大约有 45,000 项符合查询结果（耗时：0.0432秒） [XML]
Rails: Default sort order for a rails model?
...fault sorting to be done on.
Note: ASC is the code to use for Ascending and DESC is for descending (desc, NOT dsc !).
scope
Once you're used to that you can also use scope:
class Book < ActiveRecord::Base
scope :confirmed, :conditions => { :confirmed => true }
scope :published, ...
Restarting cron after changing crontab file?
...:
...cron will then examine the modification time on all crontabs
and reload those which have changed. Thus cron need not be restarted
whenever a crontab file is modified
But if you just want to make sure its done anyway,
sudo service cron reload
or
/etc/init.d/cron reload
...
How to see full query from SHOW PROCESSLIST
...
It seems phpmyadmin does not care about this, and still shows the truncated info.
– giorgio79
Aug 28 '12 at 12:41
...
How do I pipe a subprocess call to a text file?
RIght now I have a script that I run. When I run it and it hits this line, it starts printing stuff because run.sh has prints in it.
...
How to delete from select in MySQL?
...an either SELECT then DELETE in separate queries, or nest another subquery and alias the inner subquery result (looks rather hacky, though):
DELETE FROM posts WHERE id IN (
SELECT * FROM (
SELECT id FROM posts GROUP BY id HAVING ( COUNT(id) > 1 )
) AS p
)
Or use joins as sugges...
Bash: Syntax error: redirection unexpected
...solved:
The exec form makes it possible to avoid shell string munging, and
to RUN commands using a base image that does not contain /bin/sh.
Note
To use a different shell, other than /bin/sh, use the exec form
passing in the desired shell. For example,
RUN ["/bin/bash", "-c", "ec...
How to redirect 404 errors to a page in ExpressJS?
...inuing
// on, at which point we assume it's a 404 because
// no route has handled the request.
app.use(app.router);
// Since this is the last non-error-handling
// middleware use()d, we assume 404, as nothing else
// responded.
// $ curl http://localhost:3000/notfound
// $ curl http://localhost:3...
Bash command to sum a column of numbers [duplicate]
I want a bash command that I can pipe into that will sum a column of numbers. I just want a quick one liner that will do something essentially like this:
...
SQLAlchemy default DateTime
...rk latency is variable, clients experience slightly different clock drift, and different programming languages occasionally calculate time slightly differently.
SQLAlchemy allows you to do this by passing func.now() or func.current_timestamp() (they are aliases of each other) which tells the DB to c...
How do I view an older version of an SVN file?
I have an SVN file which is now missing some logic and so I need to go back about 40 revisions to the time when it had the logic I need. Other than trying to view a diff of the file in the command line ( very hard to read ), is there any way I could get a copy of that file to review so I can study i...