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Cannot add or update a child row: a foreign key constraint fails
...ign key checks before performing any operation on the table. Simply query
SET FOREIGN_KEY_CHECKS=0
This will disable foreign key matching against any other tables. After you are done with the table enable it again
SET FOREIGN_KEY_CHECKS=1
This works for me a lot of times.
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Foreign key constraints: When to use ON UPDATE and ON DELETE
... warning). The engine will track the changes for you, it's good.
ON UPDATE SET NULL : if you update a company_id in a row of table COMPANY the engine will set related USERs company_id to NULL (should be available in USER company_id field). I cannot see any interesting thing to do with that on an upd...
Size of font in CSS with slash
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This actually sets two properties and is equivalent to:
font-size: 100%;
line-height: 120%;
To quote the official documentation:
The syntax of this property is based on a traditional typographical shorthand notation to set multiple ...
Nexus 7 not visible over USB via “adb devices” from Windows 7 x64
... it will connect as MTP until told otherwise.
Thanks to @Ciaran Gallagher
Settings --> Storage --> Top Left Option (Computer USB Connection) tap--> choose MTP
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Remove icon/logo from action bar on android
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What I ended up doing is setting <application (...) android:logo="@android:color/transparent"> (...) in my AndroidManifest.xml and forcing useLogo for displayOptions in my style like this <item name="android:displayOptions">showHome|useLo...
Twitter Bootstrap - add top space between rows
...property}{sides}-{size}
Where property is one of:
m - for classes that set margin
p - for classes that set padding
Where sides is one of:
t - for classes that set margin-top or padding-top
b - for classes that set margin-bottom or padding-bottom
l - for classes that set margin-left or paddin...
Cost of len() function
...al length of the element - very fast) on every type you've mentioned, plus set and others such as array.array.
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PHP: Convert any string to UTF-8 without knowing the original character set, or at least try
...onv(mb_detect_encoding($text, mb_detect_order(), true), "UTF-8", $text);
Setting it to strict might help you get a better result.
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How many concurrent AJAX (XmlHttpRequest) requests are allowed in popular browsers?
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@DaveLawrence I just checked and the full data set seems to contain Chrome 60 and 61 which is pretty up to date.
– Simon East
Jul 20 '17 at 7:06
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reading from app.config file
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ConfigurationSettings.AppSettings is obsolete, you should use ConfigurationManager.AppSettings instead (you will need to add a reference to System.Configuration)
int value = Int32.Parse(ConfigurationManager.AppSettings["StartingMonthColu...