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In Hibernate Validator 4.1+, what is the difference between @NotNull, @NotEmpty, and @NotBlank?
I can't seem to be able to find a summary that distinguishes the difference between these three annotations.
3 Answers
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How to create full compressed tar file using Python?
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To build a .tar.gz (aka .tgz) for an entire directory tree:
import tarfile
import os.path
def make_tarfile(output_filename, source_dir):
with tarfile.open(output_filename, "w:gz") as tar:
tar.add(source_dir, arcname...
Why do results vary based on curly brace placement?
Why do the code snippets below, taken from this article , produce different results due to only a single change in the placement of curly braces?
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Postgres manually alter sequence
I'm trying to set a sequence to a specific value.
5 Answers
5
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How to attach debugger to iOS app after launch?
I have an issue I am troubleshooting which occurs very infrequently and doesn't seem to happen when I have things running under Xcode.
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How to set 'auto' for upper limit, but keep a fixed lower limit with matplotlib.pyplot
I want to set the upper limit of the y-axis to 'auto', but I want to keep the lower limit of the y-axis to always be zero. I tried 'auto' and 'autorange', but those don't seem to work. Thank you in advance.
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Nested attributes unpermitted parameters
I have a Bill object, which has many Due objects. The Due object also belongs to a Person . I want a form that can create the Bill and its children Dues all in one page. I am trying to create a form using nested attributes, similar to ones in this Railscast .
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What does “@@ -1 +1 @@” mean in Git's diff output?
I've been collecting data from the information returned from
3 Answers
3
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Is PHP's count() function O(1) or O(n) for arrays?
Does count() really count the all the elements of a PHP array, or is this value cached somewhere and just gets retrieved?
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Is onload equal to readyState==4 in XMLHttpRequest?
I am confuse about the xhr return event, as I can tell, there are not so much different between onreadystatechange --> readyState == 4 and onload, is it true?
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