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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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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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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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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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Client-server synchronization pattern / algorithm?
...ers can still roll back changes less than 90 days old, and if they sync at least once every 90 days, the updates will be incremental as before. But if they wait longer than 90 days, the app will replace the entire database.
That change reduced the size of the history table by almost 90%, so now main...
JavaScript: location.href to open in new window/tab?
... this solution, however it does still seem to trigger the pop-up block (at least in Chrome). I have a feeling that the browser is aware that it's a javascript click and treats it differently.
– Nathan Hornby
Oct 1 '14 at 12:44
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