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Mongodb Explain for Aggregation framework
...ther manipulation will be in-memory (possibly using temporary files if the allowDiskUse option is set).
Optimizing pipelines
In general, you can optimize aggregation pipelines by:
Starting a pipeline with a $match stage to restrict processing to relevant documents.
Ensuring the initial $match / ...
Import SQL file into mysql
I have a database called nitm . I haven't created any tables there. But I have a SQL file which contains all the necessary data for the database. The file is nitm.sql which is in C:\ drive . This file has size of about 103 MB. I am using wamp server.
...
cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术
... cpuid
cmp eax, 80000004h
jb not_supported
mov di, offset CPU_name
mov eax, 80000002h
cpuid
call save_string
mov eax, 80000003h
cpuid
...
Why is ArrayDeque better than LinkedList
...f you want to know, take a look at the below benchmark done by Brian.
The test setup considers:
Each test object is a 500 character String. Each String is a different object in memory.
The size of the test array will be varied during the tests.
For each array size/Queue-implementation...
Override Java System.currentTimeMillis for testing time sensitive code
...ncy injection, but even if you used a replaceable singleton you would gain testability.
This could almost be automated with search and replace for the singleton version:
Replace Calendar.getInstance() with Clock.getInstance().getCalendarInstance().
Replace new Date() with Clock.getInstance().newD...
Reflection - get attribute name and value on property
I have a class, lets call it Book with a property called Name. With that property, I have an attribute associated with it.
...
Do rails rake tasks provide access to ActiveRecord models?
...
Figured it out, the task should look like:
namespace :test do
task :new_task => :environment do
puts Parent.all.inspect
end
end
Notice the => :environment dependency added to the task
sh...
Access denied for user 'test'@'localhost' (using password: YES) except root user
...Then when you go to try to sign in to MySQL, type it in like this:
Hit 'Test Connection' and enter your password 'password'.
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UILabel with text of two different colors
...ike this:
NSMutableAttributedString *text =
[[NSMutableAttributedString alloc]
initWithAttributedString: label.attributedText];
[text addAttribute:NSForegroundColorAttributeName
value:[UIColor redColor]
range:NSMakeRange(10, 1)];
[label setAttributedText: text];
...
Sending Email in Android using JavaMail API without using the default/built-in app
...net.ssl.SSLSocketFactory");
props.put("mail.smtp.socketFactory.fallback", "false");
props.setProperty("mail.smtp.quitwait", "false");
session = Session.getDefaultInstance(props, this);
}
protected PasswordAuthentication getPasswordAuthentication()...