大约有 46,000 项符合查询结果（耗时：0.0483秒） [XML]
Count with IF condition in MySQL query
I have two tables, one is for news and the other one is for comments and I want to get the count of the comments whose status has been set as approved.
...
Sending a message to nil in Objective-C
...x:i]; This will also return 0, but since objectAtIndex: returns a pointer, and a pointer to 0 is nil/NULL, NSLog will be passed nil each time through the loop. (Although NSLog is a function and not a method, it prints out (null) if passed a nil NSString.
In some cases it's nicer to have a NullPoint...
Callback functions in C++
In C++, when and how do you use a callback function?
10 Answers
10
...
When to use Preorder, Postorder, and Inorder Binary Search Tree Traversal strategies
...ven contemplated using anything but Inorder traversal (while I am aware of and know how easy it is to adapt a program to use pre/post-order traversal).
...
What is q=0.5 in Accept* HTTP headers?
...8, en;q=0.7
would mean: "I prefer Danish, but will accept British English and other types of English."
share
|
improve this answer
|
follow
|
...
pyplot axes labels for subplots
...
You can create a big subplot that covers the two subplots and then set the common labels.
import random
import matplotlib.pyplot as plt
x = range(1, 101)
y1 = [random.randint(1, 100) for _ in xrange(len(x))]
y2 = [random.randint(1, 100) for _ in xrange(len(x))]
fig = plt.figure()...
Difference between .success() and .complete()?
...AX methods return a jqXHR object that provides .error() , .success() , and .complete() methods.
4 Answers
...
Get file size, image width and height before upload
How can I get the file size, image height and width before upload to my website, with jQuery or JavaScript?
7 Answers
...
nginx missing sites-available directory
I installed Nginx on Centos 6 and I am trying to set up virtual hosts. The problem I am having is that I can't seem to find the /etc/nginx/sites-available directory.
...
How do I use a file grep comparison inside a bash if/else statement?
...t status is 0 if any line was selected, 1 otherwise;
if any error occurs and -q was not given, the exit status is 2.
if grep --quiet MYSQL_ROLE=master /etc/aws/hosts.conf; then
echo exists
else
echo not found
fi
You may want to use a more specific regex, such as ^MYSQL_ROLE=master$, to avo...