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ERROR 1452: Cannot add or update a child row: a foreign key constraint fails
...ou can generally do one (or more) of the following steps to fix the data.
Based on your "business logic", you will need to update/match these unmatching value(s), with the existing values in the parent table. You may sometimes need to set them null as well.
Delete these rows having unmatching value...
How do I keep jQuery UI Accordion collapsed by default?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Why is the shovel operator (
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This answer is based on a false premise: both allocating and freeing short-lived objects is essentially free in any halfway decent modern GC. It is at least as fast as stack allocation in C and significantly faster than malloc / free. Also,...
What is the proper way to format a multi-line dict in Python?
...:) ATARI BASIC and GWbasic practically forced it, being top-down flow line-based compilers. it's something i adopted as i read peter norton's BASIC (and later ASM code) in paper magazines. i learned Turbo Pascal in between, but i had already learned from the examples in the paper magazines and confo...
What does “Receiver type 'CALayer' for instance message is a forward declaration” mean here?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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What is the proper way to check for null values?
...h this at all. Extension methods on object are a curse and junk up a code base, and extension methods that operate without error on null this values are pure evil.
– Nick Larsen
Mar 20 '12 at 19:01
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How to convert DateTime to VarChar
...n 2005(!) should check out the answer by Zar Shardan suggesting a solution based on FORMAT(date_value, format_string) function.
– Nickolay
Jan 25 '17 at 15:28
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Convert JavaScript String to be all lower case?
... "toLowerCase does not affect the value of the string str itself". This is base on a documentation here developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Cary Bondoc
Jun 27 '14 at 0:52
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Preloading images with jQuery
...me sleep(5) in my server side script. I implemented the following solution based off yours which seems to solve this.
Basically I added a callback to your jQuery preload plugin, so that it gets called after all the images are properly loaded.
// Helper function, used below.
// Usage: ['img1.jpg','...
IPC performance: Named Pipe vs Socket
...nted a project in C with named pipes, thanks to standart file input-output based communication (fopen, fprintf, fscanf ...) it was so easy and clean (if that is also a consideration).
I even coded them with java (I was serializing and sending objects over them!)
Named pipes has one disadvantage:
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