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Transaction isolation levels relation with locks on table
...ds the data under some condition i.e. WHERE aField > 10 AND aField < 20, A inserts data where aField value is between 10 and 20, then B reads the data again and get a different result.
SERIALIZABLE - lock on a full table(on which Select query is fired). This means, B reads the data and no othe...
What is time_t ultimately a typedef to?
...pliant systems implement the time_t type as a signed
integer (typically 32 or 64 bits wide)
which represents the number of seconds
since the start of the Unix epoch:
midnight UTC of January 1, 1970 (not
counting leap seconds). Some systems
correctly handle negative time values,
while o...
How should I escape commas and speech marks in CSV files so they work in Excel?
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221
We eventually found the answer to this.
Excel will only respect the escaping of commas and sp...
Remove useless zero digits from decimals in PHP
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How exactly does the “Specific Version” property of an assembly reference work in Visual Studio?
...at the "Specific Version" property of assembly references in Visual Studio 2010. After a few experiments with unexpected results I set out to learn as much as possible about how the property works. Even SO, it appears to me, does not have all the answers, so here is my attempt at self-answering the ...
Cleaner way to update nested structures
... more cumbersome (and it gets worse for deeper structures):
scala> val g2 = g1.copy(pacman = g1.pacman.copy(superMode = true))
g2: Game = Game("run",Pacman(3,true))
// Using the compiler-generated location classes this gets much easier:
scala> val g3 = g1.loc.pacman.superMode set true
g3: Ga...
How to migrate/convert from SVN to Mercurial (hg) on windows
...bversion Command-Line Client.
<Enable Convert Extension w/ Tortoise Hg 2>
Many thanks to bgever for pointing out in the comments that with TortoiseHg 2.0, enabling the convert extension is easier than ever. As he says
With TortoiseHG 2.0 this has been made
much simpler: Start the Tort...
Unable to read data from the transport connection : An existing connection was forcibly closed by th
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21 Answers
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Rails and PostgreSQL: Role postgres does not exist
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This message pops up, when the database user does not exist. Compare the manual here.
Multiple l...