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MySQL: Fastest way to count number of rows
...takes in count column indexes, so it will be the best result. Mysql with MyISAM engine actually stores row count, it doensn't count all rows each time you try to count all rows. (based on primary key's column)
Using PHP to count rows is not very smart, because you have to send data from mysql to ph...
What is difference between XML Schema and DTD?
I have googled this question, but I do not understand clearly what is an XML schema and DTD (document type definition), and why the XML schema is more powerful compared to DTD.
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How do I hide javascript code in a webpage?
Is it possible to hide the Javascript code from the html of a webpage, when the source code is viewed through the browsers View Source feature?
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Collections.emptyMap() vs new HashMap()
...re I can use Collections.emptyMap() ? The Documentation says I can use this method if I want my collection to be immutable.
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What is a columnar database?
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How do Columnar Databases work?
Columnar database is a concept rather a particular architecture/implementation. In other words, there isn't one particular description on how these databases work; indeed, several are build upon traditional, row-oriented, DBMS, simply storing...
Best practice for Python assert
...ess than zero throughout the function. You can use class descriptors. Here is an example:
class LessThanZeroException(Exception):
pass
class variable(object):
def __init__(self, value=0):
self.__x = value
def __set__(self, obj, value):
if value < 0:
rais...
StringUtils.isBlank() vs String.isEmpty()
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StringUtils.isBlank() checks that each character of the string is a whitespace character (or that the string is empty or that it's null). This is totally different than just checking if the string is empty.
From the linked documentation:...
Why is the gets function so dangerous that it should not be used?
... I try to compile C code that uses the gets() function with GCC, I get this warning:
11 Answers
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LINQ: Not Any vs All Don't
Often I want to check if a provided value matches one in a list (e.g. when validating):
8 Answers
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Modify tick label text
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Caveat: Unless the ticklabels are already set to a string (as is usually the case in e.g. a boxplot), this will not work with any version of matplotlib newer than 1.1.0. If you're working from the current github master, this won't work. I'm not sure what the problem is yet... It may ...