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When would you use a WeakHashMap or a WeakReference?
...WeakReference and a SoftReference.
Basically a WeakReference will be GC-d by the JVM eagerly, once the referenced object has no hard references to it. A SoftReferenced object on the other hand, will tend to be left about by the garbage collector until it really needs to reclaim the memory.
A cache...
.htaccess: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included i
...
or defined by a module not included in the server configuration
Check to make sure you have mod_rewrite enabled.
From: https://webdevdoor.com/php/mod_rewrite-windows-apache-url-rewriting
Find the httpd.conf file (usually you will find...
Convert string to integer type in Go?
...| x != num || err != nil {
b.Error(err)
}
}
}
You can run it by saving as atoi_test.go and running go test -bench=. atoi_test.go.
goos: darwin
goarch: amd64
BenchmarkStrconvParseInt-8 100000000 17.1 ns/op
BenchmarkAtoi-8 100000000 19.4 ns/op
Be...
What's the difference between TRUNCATE and DELETE in SQL
...L, Truncate is DDL (What is DDL and DML?)
Commit and Rollback
Variable by vendor
SQL*Server
Truncate can be rolled back.
PostgreSQL
Truncate can be rolled back.
Oracle
Because a TRUNCATE is DDL it involves two commits, one before and one after the statement execution. Truncate can therefor...
Query for documents where array size is greater than 1
...Update:
For mongodb versions 2.2+ more efficient way to do this described by @JohnnyHK in another answer.
1.Using $where
db.accommodations.find( { $where: "this.name.length > 1" } );
But...
Javascript executes more slowly than the native operators listed on
this page, but is very fle...
jquery disable form submit on enter
...dd the keypress event to the form as well. Also it doesn't work (anymore?) by just binding the event to the form "name" but only to the form id. Therefore I made this more obvious by changing the code example appropriately.
EDIT 3: Changed bind() to on()
...
How can I see the SQL that will be generated by a given ActiveRecord query in Ruby on Rails
...e.logger = Logger.new(STDOUT)
For Rails >= 3.1.0 this is already done by default in consoles. In case it's too noisy and you want to turn it off you can do:
ActiveRecord::Base.logger = nil
share
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Insert Data Into Temp Table with Query
...ble
WHERE
Recieved = 1 AND
application = 'MORESTUFF'
GROUP BY
CASE WHEN application LIKE '%STUFF%' THEN 'MORESTUFF' END) data
WHERE
application LIKE
isNull(
'%MORESTUFF%',
'%')
share
...
How can I deploy an iPhone application from Xcode to a real iPhone device?
... may not allow debugging, but the app will be there!
I was very surprised by this because, as you should know, I've got no idea on what all those hackings are all about! All I did was improving a little bit what I found elsewhere, as I pointed.
So yeah, the whole method doesn't work the same way a...
What is meant by the term “hook” in programming?
...ay be able to hook into the interrupt handling process though, for example by modifiying the table listing the locations of the interrupt handlers so that your code gets called first on interrupt (and then your code would call the previously present interrupt handling code, in a daisy-chain manner)
...