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Is MD5 still good enough to uniquely identify files?
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Yes. MD5 has been completely broken from a security perspective, but the probability of an accidental collision is still vanishingly small. Just be sure that the files aren't being created by someone you don't trust and who might have malicious intent.
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Cannot change column used in a foreign key constraint
.... This means your foreign key disallows changing the type of your field."
From MySQL 5.5 Reference Manual: FOREIGN KEY Constraints
Corresponding columns in the foreign key and the referenced key must
have similar internal data types inside InnoDB so that they can be
compared without a type ...
What is a memory fence?
... in device drivers than application code.
The CPU reordering is different from compiler optimisations - although the artefacts can be similar. You need to take separate measures to stop the compiler reordering your instructions if that may cause undesirable behaviour (e.g. use of the volatile keywo...
How do I upload a file with metadata using a REST web service?
...e POST requests doesn't mean the exact same HTTP requests couldn't be sent from a programming language such as Python or using any sufficiently capable tool.
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How to center an element horizontally and vertically
...div>
</section>
Approach 4 - Absolutely positioned 50% from the top with displacement:
Example Here / Full Screen Example
This approach assumes that the text has a known height - in this instance, 18px. Just absolutely position the element 50% from the top, relative to the pare...
Simple logical operators in Bash
...nd substitution: there is a command inside the parentheses, and the output from the command is used as part of the command line (after extra expansions unless the substitution is between double quotes, but that's another story).
{ … } braces are like parentheses in that they group commands, but t...
What are the recommendations for html tag?
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From my view, the problem is future-proofing it. If you use the base tag on a page, all other libraries that interact with the page will be affected by the base tag, including third party libraries that might rely on the def...
How to track down log4net problems
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I changed from C:\tmp\log4net.txt to C:\log4net.txt, then it can generate text file.
– Frank Myat Thu
Jun 29 '17 at 7:15
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Javascript Regex: How to put a variable inside a regular expression?
...iable if there is potential for malicious content (e.g. the variable comes from user input)
ES6 Update
In 2019, this would usually be written using a template string, and the above code has been updated. The original answer was:
var regex = new RegExp("ReGeX" + testVar + "ReGeX");
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string.repl...
Java ArrayList - how can I tell if two lists are equal, order not mattering?
...clear reasons why not.
There are a few answers here which suggest methods from CollectionUtils in the Apache Commons Collections library but none has spotted the most beautiful, elegant way of answering this question:
Collection<Object> culprits = CollectionUtils.disjunction( list1, list2 );...