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ERROR 1452: Cannot add or update a child row: a foreign key constraint fails
I have created tables in MySQL Workbench as shown below :
21 Answers
21
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Best Practice: Access form elements by HTML id or name attribute?
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Give your form an id only, and your input a name only:
<form id="myform">
<input type="text" name="foo">
Then the most standards-compliant and least problematic way to access your input element is via:
document.getElementById("myform").elements["foo"]
using .elements["foo"]...
Changing route doesn't scroll to top in the new page
... $window.scrollTop(0,0)works better for me than autoscroll. In my case I have views that enter and leave with transitions.
– IsidroGH
Dec 21 '14 at 15:32
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Switch statement fall-through…should it be allowed? [closed]
...switch statement fall-through. Actually, I can't remember it ever entering my consciousness as a possible way to do things as it was drilled into my head early on that it was nothing more than a bug in the switch statement. However, today I ran across some code that uses it by design, which got me i...
Deserializing JSON data to C# using JSON.NET
...ng the generic DeserializeObject method?
JsonConvert.DeserializeObject<MyAccount>(myjsondata);
Any missing fields in the JSON data should simply be left NULL.
UPDATE:
If the JSON string is an array, try this:
var jarray = JsonConvert.DeserializeObject<List<MyAccount>>(myjsond...
Can you have a within a ?
Here is the story: I'm using SWFObject to insert a Flash object into my page. The embedding eats my span . So, I lose all my CSS for it. I was thinking of moving all of the CSS to the parent so I don't lose my CSS styles when the Flash appears.
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How to launch Safari and open URL from iOS app
...f he stops by a particular page then can I get the current webpage link in my code?
– Varun Jain
Jun 1 '16 at 7:33
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Is the pImpl idiom really used in practice?
... I use it everywhere, or with caution?
Of course it is used. I use it in my project, in almost every class.
Reasons for using the PIMPL idiom:
Binary compatibility
When you're developing a library, you can add/modify fields to XImpl without breaking the binary compatibility with your client ...
Comparing two java.util.Dates to see if they are in the same day
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Thanks, that looks like it will do what I want. In my case I'm comparing successive dates in a series, so it looks like I could just use Calendar instances instead of Date instances in my series.
– Jason S
Mar 25 '10 at 17:20
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Batch equivalent of Bash backticks
...th the for /f command:
for /f "usebackq tokens=*" %%a in (`echo Test`) do my_command %%a
Yeah, it's kinda non-obvious (to say the least), but it's what's there.
See for /? for the gory details.
Sidenote: I thought that to use "echo" inside the backticks in a "for /f" command would need to be do...