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Check if database exists in PostgreSQL using shell
...s
(4 rows)
Using the naive approach means that searching for a database called "List, "Access" or "rows" will succeed. So we pipe this output through a bunch of built-in command line tools to only search in the first column.
The -t flag removes headers and footers:
my_db | my_user | UTF...
How to convert image to byte array
...n non-optimal because they changed the bit depth of the pixels (24-bit vs. 32-bit) or ignored the image's resolution (dpi).
// ImageConverter object used to convert byte arrays containing JPEG or PNG file images into
// Bitmap objects. This is static and only gets instantiated once.
private...
Override configured user for a single git commit
...ing any git command in the active shell. It'll then remember the user for all subsequent runs.
(obviously cross reference an input user value to exact desired names and email addresses for the various git auther/name values in the case block and update the assigns as needed)
git() {
echo "Runni...
C# HttpClient 4.5 multipart/form-data upload
...pClient was referring to the previous design. It's easy to confuse. Basically, with the IHttpClientFactory, the HttpClient Dispose doesn't really do anything (stackoverflow.com/a/54326424/476048) and the internal handlers are managed by the HttpClientFactory.
– Berin Loritsch...
How to perform mouseover function in Selenium WebDriver using Java?
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Its not really possible to perform a 'mouse hover' action, instead you need to chain all of the actions that you want to achieve in one go. So move to the element that reveals the others, then during the same chain, move to the now rev...
Rails :include vs. :joins
...de functionality was changed with Rails 2.1. Rails used to do the join in all cases, but for performance reasons it was changed to use multiple queries in some circumstances. This blog post by Fabio Akita has some good information on the change (see the section entitled "Optimized Eager Loading")....
Bash Templating: How to build configuration files from templates with Bash?
...\}/defined $ENV{$1} ? $ENV{$1} : $&/eg' < template.txt
to replace all ${...} strings with corresponding enviroment variables (do not forget to export them before running this script).
For pure bash this should work (assuming that variables do not contain ${...} strings):
#!/bin/bash
while...
Django rest framework, use different serializers in the same ModelViewSet
... like to provide two different serializers and yet be able to benefit from all the facilities of ModelViewSet :
6 Answers
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Is multiplication and division using shift operators in C actually faster?
...n to shift, shift. If you mean to multiply, multiply. Do what is semantically clearest--your coworkers will thank you later. Or, more likely, curse you later if you do otherwise.
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Block Declaration Syntax List
...at this is distinct from "Blocks as Parameters"; in this instance, you're calling a method that wants a block argument with an anonymous block. If you have already declared a block variable, it is sufficient to pass the variable name as the argument.
[someObject doSomethingWithBlock: ^return_type (...