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How to make a cross-module variable?
...ecause it affects every module. If I want to create another variable that works the same way, how would I do it?
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ALTER TABLE, set null in not null column, PostgreSQL 9.1
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ALTER TABLE person ALTER COLUMN phone DROP NOT NULL;
More details in the manual: http://www.postgresql.org/docs/9.1/static/sql-altertable.html
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“Add unimplemented methods” feature in the Android Studio
...plement) all of the required methods of the particular class. I'm looking for this feature in the Android Studio IDE, but without success so far. Is there something similar? For me it is one of the key-features and can't live without.
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Running multiple commands with xargs
...e cases, I need multiple commands to process the argument instead of one. For example:
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is there any way to force copy? copy without overwrite prompt, using windows?
...windows commands(it's a long list) where it does all these magical things for me, but whenever I use copy, it stops to ask fro overwrite prompt. When I type yes, it overwrites the old file then just stops there.
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Dilemma: when to use Fragments vs Activities:
... will tell you: "When I see the UI, I will know whether to use an Activity or a Fragment". In the beginning this will not have any sense, but in time, you will actually be able to tell if you need Fragment or not.
There is a good practice I found very helpful for me. It occurred to me while I was ...
How to use gradle zip in local system without downloading when using gradle-wrapper
... location specified by your wrapper configuration. A
relative URL is supported - you can specify a distribution file
relative to the location of gradle-wrapper.properties file.
So, I changed distributionUrl property in gradle-wrapper.properties to
distributionBase=GRADLE_USER_HOME
distributi...
Why does my application spend 24% of its life doing a null check?
I've got a performance critical binary decision tree, and I'd like to focus this question on a single line of code. The code for the binary tree iterator is below with the results from running performance analysis against it.
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What is the difference between new/delete and malloc/free?
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new/delete
Allocate/release memory
Memory allocated from 'Free Store'
Returns a fully typed pointer.
new (standard version) never returns a NULL (will throw on failure)
Are called with Type-ID (compiler calculates the size)
Has a version explicitly to ha...
Difference between rake db:migrate db:reset and db:schema:load
... which I don't understand is how rake db:schema:load different from the former two.
5 Answers
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