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Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails
...if I understand this correctly, we can add a foreign key to a table that already has data in it, but only if a child row exists for each row in the parent table? If there are no child rows for each row in the parent table (which is what your query discovers) then the foreign key script will fail.
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How should I copy Strings in Java?
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@GriffeyDog: I am reading the question less literally. What I am saying is that it is safe to give out references to a string object without fear that someone might modify the string.
– NPE
May 15 '12 at ...
Dynamic Anonymous type in Razor causes RuntimeBinderException
...r.AnonymousObjectToHtmlAttributes I knew this absolutely had to baked in already and didn't want to reinvent the wheel with similar handrolled code.
– Chris Marisic
May 11 '11 at 21:37
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FB OpenGraph og:image not pulling images (possibly https?)
...a) running the OG Debugger on all your links: the image will be cached and ready for sharing after ~10 minutes or b) specifying og:image:width and og:image:height. (Read more in the above link)
Still wondering though what takes them so long ...
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Multiple Inheritance in PHP
...rithm is delegated to dispatcher. This is called Strategy Pattern, you can read more on it here.
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How to do Base64 encoding in node.js?
...that can result from using it in the ws library.
The code snippets should read:
console.log(Buffer.from("Hello World").toString('base64'));
console.log(Buffer.from("SGVsbG8gV29ybGQ=", 'base64').toString('ascii'));
After this answer was written, it has been updated and now matches this.
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MySQL Fire Trigger for both Insert and Update
...ure_to_run_processes_due_to_changes_on_table(IN table_row_id VARCHAR(255))
READS SQL DATA
BEGIN
-- Write your MySQL code to perform when a `table` row is inserted or updated here
END//
DELIMITER ;
You note that I take care to restore the delimiter when I am done with my business defining the...
NSDate get year/month/day
...eels like it makes things intentionally more arduous. If you have time to read an 800 page book on the fundamentals of every language, cheers, but the rest of us have apps to deliver on time and on budget.
– Crake
Nov 14 '13 at 2:40
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How to lazy load images in ListView in Android
... return null;
}
}
public void fetchDrawableOnThread(final String urlString, final ImageView imageView) {
if (drawableMap.containsKey(urlString)) {
imageView.setImageDrawable(drawableMap.get(urlString));
}
final Handler handler = new Ha...
How to Sign an Already Compiled Apk
...ou don't have to sign with the original keystore, just generate a new one. Read up on the details: http://developer.android.com/guide/publishing/app-signing.html
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