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PostgreSQL: Is it better to use multiple databases with one schema each, or one database with multip
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A PostgreSQL "schema" is roughly the same as a MySQL "database". Having many databases on a PostgreSQL installation can get problematic; having many schemas will work with no trouble. So you definitely want to go with one database and multiple schemas within that database...
Why is IoC / DI not common in Python?
...rt psycopg
self.database_interface = psycopg
elif config_dbms_name == 'mysql':
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Later code can then create a database interface by writing:
my_db_connection = self.database_interface()
# Do stuff with database.
Instead of the boilerplate factory functions that Java and C++ need, Pyth...
What is the difference between “#!/usr/bin/env bash” and “#!/usr/bin/bash”?
...up. Let me demonstrate this:
Usually /bin is a well protected place, only root is able to change anything there. Your home directory is not, though, any program you run is able to make changes to it. That means malicious code could place a fake bash into some hidden directory, modify your .bash_pro...
Abusing the algebra of algebraic data types - why does this work?
.... There's no notion of subtraction of types, let alone division and square roots. So I guess my question is: when can you go from an algebraic manipulation assuming X is an element of the real numbers to a true statement about types, and moreover, where the does the correspondence (coefficient of n...
When to add what indexes in a table in Rails
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Not the answer you're looking for? Browse other questions tagged mysql ruby-on-rails activerecord or ask your own question.
Why are margin/padding percentages in CSS always calculated against width?
...he simplest case that browsers calculate block widths from the outside in (root to tips), then flow content into those blocks to determine their heights (tips to root).
– sam
Oct 10 '13 at 1:47
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Is there a command to undo git init?
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remove the .git folder in your project root folder
if you installed submodules and want to remove their git, also remove .git from submodules folders
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Using crontab to execute script every minute and another every 24 hours [closed]
... runs as the user who submitted it. If you want to run a cron job as a non-root user, you should use the crontab command to submit it (and not worry about where the crontab is stored). Don't mess around with /etc/crontab unless you really need to.
– Keith Thompson
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Get Image Height and Width as integer values?
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Chmod image dir to 755
Also try to prefix path with $_SERVER["DOCUMENT_ROOT"], this helps sometimes when you are not able to read files.
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Using Transactions or SaveChanges(false) and AcceptAllChanges()?
...ich database it's talking to, Rollback() is called in case it's talking to MySql or something that doesn't have that automatic behavior.
– Jared
Jun 13 '16 at 20:52
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