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In C# what is the difference between ToUpper() and ToUpperInvariant()?
...is just one example I know off the top of my head... partly because it bit me years ago in Java, where I was upper-casing a string and comparing it with "MAIL". That didn't work so well in Turkey...
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MySQL, better to insert NULL or empty string?
I have a form on a website which has a lot of different fields. Some of the fields are optional while some are mandatory. In my DB I have a table which holds all these values, is it better practice to insert a NULL value or an empty string into the DB columns where the user didn't put any data?
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Why are variables “i” and “j” used for counters?
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It comes ultimately from mathematics: the summation notation traditionally uses i for the first index, j for the second, and so on. Example (from http://en.wikipedia.org/wiki/Summation):
It's also used that way for collect...
Difference of Maven JAXB plugins
I have determined that two JAXB plugins for Maven 2 exist, with some different configurations.
6 Answers
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What's wrong with using $_REQUEST[]?
...on here saying not to use the $_REQUEST variable. I usually don't, but sometimes it's convenient. What's wrong with it?
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What's the best mock framework for Java? [closed]
What's the best framework for creating mock objects in Java? Why? What are the pros and cons of each framework?
14 Answers
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MVC Razor view nested foreach's model
...he quick answer is to use a for() loop in place of your foreach() loops. Something like:
@for(var themeIndex = 0; themeIndex < Model.Theme.Count(); themeIndex++)
{
@Html.LabelFor(model => model.Theme[themeIndex])
@for(var productIndex=0; productIndex < Model.Theme[themeIndex].Produc...
What did MongoDB not being ACID compliant before v4 really mean?
...tabase expert and have no formal computer science background, so bear with me. I want to know the kinds of real world negative things that can happen if you use an old MongoDB version prior to v4 , which were not ACID compliant. This applies to any ACID noncompliant database.
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C pointer to array/array of pointers disambiguation
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int (*arr)[8]; // A pointer to an array of integers
The third one is same as the first.
The general rule is operator precedence. It can get even much more complex as function pointers come into the picture.
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Why does an SSH remote command get fewer environment variables then when run manually? [closed]
...m man bash:
A login shell is one whose first character of argument
zero is a -, or one started with the --login option.
An interactive shell is one started without non-option
arguments and without the -c option whose standard input
and error are both c...