大约有 35,100 项符合查询结果（耗时：0.0332秒） [XML]
Modelling an elevator using Object-Oriented Analysis and Design [closed]
...the direction. It receives request from this elevator.
Then there is a bank. It contains the elevators and receives the requests from the floors. These are scheduled to all active elevators (not in maintenance).
The scheduling will be like:
if available pick a standing elevator for this floor.
e...
What is ActiveMQ used for - can we apply messaging concept using a Database?
I looked it up and it used to send messages between 2 systems.
But why? Why wouldn't you just use a Database ?
There must be some feature that ActiveMQ has that Databases do not?
...
What is an alternative to execfile in Python 3?
It seems they canceled in Python 3 all the easy way to quickly load a script by removing execfile()
12 Answers
...
Is it feasible to do (serious) web development in Lisp? [closed]
It obviously is possible to write almost any kind of application in almost any programming language, especially in such a powerful one as Lisp (be it Scheme or Common Lisp). But is it practical to use it for web development? If so, what should be a good starting point? Where can be found the proper ...
Merge PDF files
...ypdf or its successor PyPDF2:
A Pure-Python library built as a PDF toolkit. It is capable of:
* splitting documents page by page,
* merging documents page by page,
(and much more)
Here's a sample program that works with both versions.
#!/usr/bin/env python
import sys
try:
from PyPD...
How to Generate unique file names in C#
...age10.png") and if that fails (because the file already exists), I fall back to GUIDs.
Update:
Recently, I've also use DateTime.Now.Ticks instead of GUIDs:
var myUniqueFileName = string.Format(@"{0}.txt", DateTime.Now.Ticks);
or
var myUniqueFileName = $@"{DateTime.Now.Ticks}.txt";
The benefi...
Separating class code into a header and cpp file
...red Mar 6 '12 at 8:09
Ferenc DeakFerenc Deak
29.3k1313 gold badges8080 silver badges141141 bronze badges
...
How to concatenate strings of a string field in a PostgreSQL 'group by' query?
I am looking for a way to concatenate the strings of a field within a group by query. So for example, I have a table:
14 An...
How do you test that a Python function throws an exception?
...
Robert Siemer
23.9k77 gold badges6767 silver badges8282 bronze badges
answered Sep 24 '08 at 20:02
MoeMoe
...
How do I use CREATE OR REPLACE?
...
This works on functions, procedures, packages, types, synonyms, trigger and views.
Update:
After updating the post for the third time, I'll reformulate this:
This does not work on tables :)
And yes, there is documentation on ...