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Getting a list of values from a list of dicts
... simple at first glance, because find returns match objects, which include all kinds of things besides just the matched value, such as a path directly to each item. But for more complex expressions, being able to specify a path like '*.[*].value' instead of a comprehension clause for each * can make...
How to build jars from IntelliJ properly?
....
The above sets the "skeleton" to where the jar will be saved to. To actually build and save it do the following:
Extract to the target Jar
OK
Build | Build Artifact | Build
Try Extracting the .jar file from
ProjectName | out | artifacts | ProjectName_jar | ProjectName.jar
...
Do I use , , or for SVG files?
...svgprimer.html#SVG_in_HTML
If you use <object> then you get raster fallback for free*:
<object data="your.svg" type="image/svg+xml">
<img src="yourfallback.jpg" />
</object>
*) Well, not quite for free, because some browsers download both resources, see Larry's suggesti...
How to read a single character from the user?
... except ImportError:
self.impl = _GetchUnix()
def __call__(self): return self.impl()
class _GetchUnix:
def __init__(self):
import tty, sys
def __call__(self):
import sys, tty, termios
fd = sys.stdin.fileno()
old_settings = termios.tcge...
JSON serialization of Google App Engine models
...
There is a small mistake in the code: Where you have "output[key] = to_dict(model)" it should be: "output[key] = to_dict(value)". Besides that it's perfect. Thanks!
– arikfr
Nov 7 '09 at 22:02
...
How can I export the schema of a database in PostgreSQL?
... only the schema to stdout as .sql.
For windows, you'll probably want to call pg_dump.exe. I don't have access to a Windows machine but I'm pretty sure from memory that's the command. See if the help works for you too.
shar...
The server principal is not able to access the database under the current security context in SQL Se
...u would after restoring a db). A stock (cursor driven) script to re-sync all accounts is attached:
USE <your database>
GO
-------- Reset SQL user account guids ---------------------
DECLARE @UserName nvarchar(255)
DECLARE orphanuser_cur cursor for
SELECT UserName = su.name
F...
How do you determine the ideal buffer size when using FileInputStream?
...as well.
This is why you see most buffers sized as a power of 2, and generally larger than (or equal to) the disk block size. This means that one of your stream reads could result in multiple disk block reads - but those reads will always use a full block - no wasted reads.
Now, this is offset qu...
Check if a row exists, otherwise insert
...cedure that updates a row in a table. If the row doesn't exist, insert it. All this steps wrapped by a transaction.
11 Ans...
Why does volatile exist?
...ed 16 bit value as a semaphore to know when the other guy was done. Essentially we did this:
void waitForSemaphore()
{
volatile uint16_t* semPtr = WELL_KNOWN_SEM_ADDR;/*well known address to my semaphore*/
while ((*semPtr) != IS_OK_FOR_ME_TO_PROCEED);
}
Without volatile, the optimizer sees ...