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Database development mistakes made by application developers [closed]
... the log output from Hibernate and you'll see all the queries begin with:
SELECT DISTINCT ...
This is a bit of a shortcut to ensuring you don't return duplicate rows and thus get duplicate objects. You'll sometimes see people doing this as well. If you see it too much it's a real red flag. Not...
string.Join on a List or other type
...le<T>)
If you can't upgrade, you can achieve the same effect using Select and ToArray.
return string.Join(",", a.Select(x => x.ToString()).ToArray());
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Distinct not working with LINQ to Objects
...ey were hit during the foreach loop. This is because the var temp = books.SelectMany(book => book.Authors).Distinct(); returns an IEnumerable, meaning that the request is not executed right away, it is only executed when the data is used. If you would like an example of this firing right away, ...
What is a method group in C#?
...
Also, if you are using LINQ, you can apparently do something like myList.Select(methodGroup).
So, for example, I have:
private string DoSomethingToMyString(string input)
{
// blah
}
Instead of explicitly stating the variable to be used like this:
public List<string> GetStringStuff()...
“ClickOnce does not support the request execution level 'requireAdministrator.'”
...shing wizard, or 'Publish Now', the click-once checkbox gets automatically selected...
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How can you integrate a custom file browser/uploader with CKEditor?
...your callback function. Let's say you put it into $callback.
When someone selects a file, run this JavaScript to inform CKEditor which file was selected:
window.opener.CKEDITOR.tools.callFunction(<?php echo $callback; ?>,url)
Where "url" is the URL of the file they picked. An optional thir...
MySQL, better to insert NULL or empty string?
...or an empty string using a bound variable but not for a NULL. This query:
SELECT *
FROM mytable
WHERE mytext = ?
will never match a NULL in mytext, whatever value you pass from the client. To match NULLs, you'll have to use other query:
SELECT *
FROM mytable
WHERE mytext IS NULL
...
curl json post request via terminal to a rails app
I'm trying to create a user on my rails app with a curl command from os x terminal. No matter how I format the data, the app returns a responses that non of my validations have passed.
...
VIM + JSLint?
...
You can follow the intructions from JSLint web-service + VIM integration or do what I did:
Download http://jslint.webvm.net/mylintrun.js and http://www.jslint.com/fulljslint.js
and put them in a directory of your choice.
Then add the following line to t...
How to use JavaScript regex over multiple lines?
...onment and version of Javascript (ECMAscript), and I realise this post was from 2009, but just for completeness, with the release of ECMA2018 we can now use the s flag to cause . to match '\n', see https://stackoverflow.com/a/36006948/141801
Thus:
let s = 'I am a string\nover several\nlines.';
con...