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Why is the default value of the string type null instead of an empty string?
... edited May 23 '17 at 12:18
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answered Jan 15 '13 at 12:17
HabibHabib
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How can I rename a database column in a Ruby on Rails migration?
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http://api.rubyonrails.org/classes/ActiveRecord/Migration.html
Under Available Transformations
rename_column(table_name, column_name, new_column_name):
Renames a column but keeps the type and content.
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Is Zookeeper a must for Kafka?
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Important Update stackoverflow.com/a/57328140/3438570
– theodosis
Jul 1 at 16:05
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Default string initialization: NULL or Empty? [closed]
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seems like this is a special case of the http://en.wikipedia.org/wiki/Null_Object_pattern
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Android 1.6: “android.view.WindowManager$BadTokenException: Unable to add window — token null is not
...ing part is the getApplicationContext() is verbatim from developer.android.com :(
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Workflow for statistical analysis and report writing
...ta each time you make a change to a subsequent step. Also, keeping my code compartmentalized like this means I can come back to a long forgotten project and quickly read load.R and work out what data I need to update, and then look at do.R to work out what analysis was performed.
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How do I update all my CPAN modules to their latest versions?
... ever go back to CPAN shell. To upgrade all of your modules in one go, the command is:
cpan-outdated -p | cpanm
I recommend you install cpanminus like the docs describe:
curl -L https://cpanmin.us | perl - App::cpanminus
And then install cpan-outdated along with all other CPAN modules using cp...
Facebook Graph API v2.0+ - /me/friends returns empty, or only friends who also use my application
...k have published an FAQ on these changes here: https://developers.facebook.com/docs/apps/faq which explain all the options available to developers in order to invite friends etc.
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Can you organize imports for an entire project in eclipse with a keystroke?
...eded to correct the R class file for android, and the ambiguity is between com.example.R and android.R. The solution I found is to hide the android.R class in the build path configuration during the import correction, and then to put it back. It works since I never need to import android.R
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