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When and how should I use a ThreadLocal variable?
...d to be very careful about cleaning up any ThreadLocals you get() or set() by using the ThreadLocal's remove() method.
If you do not clean up when you're done, any references it holds to classes loaded as part of a deployed webapp will remain in the permanent heap and will never get garbage collect...
When to use CouchDB over MongoDB and vice versa
...ning is important.
A recent (Feb 2012) and more comprehensive comparison by Riyad Kalla,
MongoDB : Master-Slave Replication ONLY
CouchDB : Master-Master Replication
A blog post (Oct 2011) by someone who tried both, A MongoDB Guy Learns CouchDB commented on the CouchDB's paging being not as us...
How to copy a selection to the OS X clipboard
... sometimes you don't even have to do the whole "+y ). And you check this by just writing >vim in the terminal and then the version-number is when you start it up.
– Zeth
Sep 9 '16 at 16:50
...
When is assembly faster than C?
...// perform multiplication
return (int) (product >> 16); // shift by the fixed point bias
}
The problem with this code is that we do something that can't be directly expressed in the C-language. We want to multiply two 32 bit numbers and get a 64 bit result of which we return the middle 3...
How to get the unique ID of an object which overrides hashCode()?
... So if an object is created at memory address 0x2000, then is moved by the VM, then an other object is created at 0x2000, will they have the same System.identityHashCode()?
– Limited Atonement
Jun 7 '13 at 22:54
...
MySQL: Invalid use of group function
...
Also if GROUP BY is used, HAVING should be after GROUP BY
– Viacheslav
Jun 22 '14 at 17:40
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LINQ to Entities case sensitive comparison
.... That means the case sensitivity is at the mercy of your SQL Server which by default has SQL_Latin1_General_CP1_CI_AS Collation and that is NOT case sensitive.
Using ObjectQuery.ToTraceString to see the generated SQL query that has been actually submitted to SQL Server reveals the mystery:
string s...
Most useful NLog configurations [closed]
...u great flexibility in the configuration of the loggers (control globally, by namespace, by specific logger name, etc).
Use non-classname-based loggers where appropriate. Maybe you have one function for which you really want to control the logging separately. Maybe you have some cross-cutting log...
You can't specify target table for update in FROM clause
...e started, or the inner query might use data that has already been updated by the query as it's in progress. Neither of these side-effects is necessarily desirable, so the safest bet is to force you to specify what will happen using an extra table.
– siride
Mar...
How to find duplicates in 2 columns not 1
...e_id,
upcharge_title,
count(*)
from your_table
group by stone_id,
upcharge_title
having count(*) > 1
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