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Spring @Transactional - isolation, propagation
Can someone explain what isolation & propagation parameters are for in the @Transactional annotation via real-world example?
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Reading output of a command into an array in Bash
...acters like *, ?, [...].
To get the output of a command in an array, with one line per element, there are essentially 3 ways:
With Bash≥4 use mapfile—it's the most efficient:
mapfile -t my_array < <( my_command )
Otherwise, a loop reading the output (slower, but safe):
my_array=()
wh...
On design patterns: When should I use the singleton?
...that there are actually very few "acceptable" reasons to use a Singleton.
One reason that tends to come up over and over again on the internets is that of a "logging" class (which you mentioned). In this case, a Singleton can be used instead of a single instance of a class because a logging class u...
How to join two sets in one line without using “|”
...some cases), you can use set.update():
S.update(T)
The return value is None, but S will be updated to be the union of the original S and T.
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SQL how to increase or decrease one for a int column in one command
...n. During check in or check out, we need to update that Quantity column by one. Is there a way to do this in one action or we have to get the existing value and then add or minus one on top of it?
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“Cloning” row or column vectors
Sometimes it is useful to "clone" a row or column vector to a matrix. By cloning I mean converting a row vector such as
9 A...
Sticky and NON-Sticky sessions
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When your website is served by only one web server, for each client-server pair, a session object is created and remains in the memory of the web server. All the requests from the client go to this web server and update this session object. If some data needs t...
All possible array initialization syntaxes
... third line must be written as displayed, as array initialization syntax alone is not enough to satisfy the compiler's demands. The fourth could also use inference. So if you're into the whole brevity thing, the above could be written as
var array = new string[2]; // creates array of length 2, defa...
Reference: Comparing PHP's print and echo
...ZEND_ECHO_SPEC_CONST_HANDLER" will be invoked. The handler for print does one thing before it invokes the handler for echo, it makes sure that the return value for print is 1, as follows:
ZVAL_LONG(&EX_T(opline->result.var).tmp_var, 1);
(see here for reference)
The return value is a conv...
How can I initialise a static Map?
...tic {
Map<Integer, String> aMap = ....;
aMap.put(1, "one");
aMap.put(2, "two");
myMap = Collections.unmodifiableMap(aMap);
}
}
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