大约有 7,000 项符合查询结果（耗时：0.0180秒） [XML]
How to log something in Rails in an independent log file?
...ActiveRecord::Base
def my_logger
@@my_logger ||= Logger.new("#{Rails.root}/log/my.log")
end
def before_save
my_logger.info("Creating user with name #{self.name}")
end
end
Here I used a class attribute to memoize the logger. This way it won't be created for every single User object...
android: move a view on touch move (ACTION_MOVE)
...nds Activity implements View.OnTouchListener {
TextView _view;
ViewGroup _root;
private int _xDelta;
private int _yDelta;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
_root = (ViewGroup)findViewById(R.id...
What is the difference between require and require-dev sections in composer.json?
...
According to composer's manual:
require-dev (root-only)
Lists packages required for developing this package, or running tests, etc. The dev requirements of the root package are installed by default. Both install or update support the --no-dev option that prevents d...
SQL Add foreign key to existing column
...
MySQL / SQL Server / Oracle / MS Access:
ALTER TABLE Orders
ADD FOREIGN KEY (P_Id)
REFERENCES Persons(P_Id)
To allow naming of a FOREIGN KEY constraint, and for defining a FOREIGN KEY constraint on multiple columns, use th...
Hibernate: hbm2ddl.auto=update in production?
...tabase schema.
The awesome thing is that I can take a totally blank slate mysql database on my laptop, fire up the app, and right away the schema is set up for me. It also makes it easy to test schema changes by applying these to a local-dev or staging db first.
The easiest way to get started wit...
How to delete SQLite database from Android programmatically
...ge back "rm failed for mydatabase.db, Permission denied". Must you have a rooted phone for this to work? Or is there a way to specify a permission? Or does it only work on the emulator?
– PeteH
Jan 24 '13 at 7:21
...
How to get the start time of a long-running Linux process?
... PID %CPU %MEM VSZ RSS TT STAT STARTED CMD
root 1 0.0 0.1 2800 1152 ? Ss Mon Dec 23 00:31:44 2013 /sbin/init
root 5151 0.3 0.1 4732 1980 pts/2 S Sat Mar 8 16:50:47 2014 bash
For a discussion of how the information is published ...
How do I create a variable number of variables?
...s sometimes write code like this:
my_calculator.button_0 = tkinter.Button(root, text=0)
my_calculator.button_1 = tkinter.Button(root, text=1)
my_calculator.button_2 = tkinter.Button(root, text=2)
...
The coder is then left with a pile of named variables, with a coding effort of O(m * n), where m ...
How to make a programme continue to run after log out from ssh? [duplicate]
I have a program that takes a lot of time to finish.
It is running as root over ssh.
I want it to continue to run after I logout,is this possible and how would I achieve this?
...
Can someone explain the right way to use SBT?
...use sbt is:
Use sbt-extras - just get the shell script and add it to the root of you project
Create a project folder with a MyProject.scala file for setting up sbt. I much prefer this over the build.sbt approach - it's scala and is more flexible
Create a project/plugins.sbt file and add the approp...