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Run PostgreSQL queries from the command line
... thumb is:
If you received no response from psql but you were expecting at least SOMETHING, then you forgot the semicolon ;
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Many-to-many relationship with the same model in rails?
...end
then post.posts && post.reversed_posts should both works, at least worked for me.
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When to use EntityManager.find() vs EntityManager.getReference() with JPA
...on when getReference is called". This is not possible without a SELECT (at least for checking the row existence), is it? So an eventually SELECT depends on the implementation.
– adrhc
Jul 9 '18 at 7:48
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Appending to an empty DataFrame in Pandas?
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note that at least in june 2018 if you'd like the new rows to auto-index themselves, you should write df.append(data, ignore_index=True). Thanks for the great answer!
– Adam B
Jun 15 '18 at 19:04
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Dynamic Sorting within SQL Stored Procedures
... for DBAs.
What I do from code is refactor the paging and sorting so I at least don't have a lot of repetition there with populating values for @SortExpr and @SortDir.
As far as the SQL is concerned, keep the design and formatting the same between different stored procedures, so it's at least neat...
How to configure MongoDB Java driver MongoOptions for production use?
...you can use higher values for w whcih tell MongoDB to send the write to at least "w" members of the replica set before returning (or more accurately, wait for the replication of your write to "w" members). You can also set w to the string "majority" which tells MongoDB to perform the write to the ma...
Do HTML5 custom data attributes “work” in IE 6?
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I think IE has always supported this (at least starting from IE4) and you can access them from JS. They were called 'expando properties'. See old MSDN article
This behaviour can be disabled by setting the expando property to false on a DOM element (it's true by def...
Upload artifacts to Nexus, without Maven
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At least, for our Sonatype Nexus™ 2.11.1-01 I had to grant the user the privilege Artifact Upload. Unfortunately, I couldn't find anything in the docs mentioning this... (Edit: I see, Ed I has already pointed this out )
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Repeat string to certain length
...; 'abc' * 7
'abcabcabcabcabcabcabc'
So, to repeat a string until it's at least as long as the length you want, you calculate the appropriate number of repeats and put it on the right-hand side of that multiplication operator:
def repeat_to_at_least_length(s, wanted):
return s * (wanted//len(s...
Do on-demand Mac OS X cloud services exist, comparable to Amazon's EC2 on-demand instances? [closed]
...t increments). One caveat is that you need to periodically use the plan at least once every 60 days for the pay as you go plan or else you lose unused credits. So that's like minimum of spending 1 credit /1 hour every 60 days.
One last comment for now, from my evaluation, you'll need high bandwidth...