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How to debug Lock wait timeout exceeded on MySQL?
...alculated from the last 4 seconds
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 9014315, signal count 7805377
Mutex spin waits 0, rounds 11487096053, OS waits 7756855
RW-shared spins 722142, OS waits 211221; RW-excl spins 787046, OS waits 39353
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LATES...
Check a collection size with JSTL
...ts:
${empty companies}
This checks for null and empty lists/collections/arrays. It doesn't get you the length but it satisfies the example in the OP. If you can get away with it this is just cleaner than importing a tag library and its crusty syntax like gt.
...
In C++, if throw is an expression, what is its type?
...erand has type (possibly cv-qualified) void, then the lvalue-to-rvalue,
array-to-pointer, and function-to-pointer standard conversions are performed on the second and
third operands, and one of the following shall hold:
— The second or the third operand (but not both) is a throw-expressi...
What is the usefulness of PUT and DELETE HTTP request methods?
... and you'll find it straight away.
Building an API without the whole HTTP array of methods makes it easier to be consumed and maintained afterwards
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How to generate a random int in C?
...s not safe to use */
return 1;
}
/* myString will be an array of 32 random bytes, not null-terminated */
randombytes_buf(myString, 32);
/* myInt will be a random number between 0 and 9 */
myInt = randombytes_uniform(10);
}
randombytes_uniform() is cryptograp...
How do you format the day of the month to say “11th”, “21st” or “23rd” (ordinal indicator)?
...cell 0 is wasted)
String[] ordinalIndicators = new String[31 + 1];
Arrays.fill(ordinalIndicators, 1, ordinalIndicators.length, "th");
ordinalIndicators[1] = ordinalIndicators[21] = ordinalIndicators[31] = "st";
ordinalIndicators[2] = ordinalIndicators[22] = "nd";
ordinalIndicator...
How do I forward parameters to other command in bash script?
...
$@ essentially treats each element of the array as a quoted string - they are passed along without opportunity for expansion. It also ensures that each is seen as a separate word. This explanation along with a test script demonstrating the difference is here: tldp.or...
Bubble Sort Homework
...n, can be optimized (obviously) by decreasing the problem space of the 2nd array. But same O(n^2) complexity.
def bubble(arr):
l = len(arr)
for a in range(l):
for b in range(l-1):
if (arr[a] < arr[b]):
arr[a], arr[b] = arr[b], arr[a]
return arr...
Return all enumerables with yield return at once; without looping through
...y're implemented using iterator blocks). Try changing them to return a new array or something like that, and you'll see what I mean.
– Jon Skeet
Aug 10 '10 at 5:22
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The new keyword “auto”; When should it be used to declare a variable type? [duplicate]
...ity here
for(auto it = std::begin(v); it != std::end(v); ++it)//v could be array as well
{
//..
}
But when the type is not very well-known and infrequently used , then I think auto seems to reduce readability, such as here:
//bad : auto decreases readability here
auto obj = ProcessData(s...