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Updating MySQL primary key
...dd primary key (user_2, user_1, type );
unlock tables;
The lock should stop further updates coming in while your are doing this. How long this takes obviously depends on the size of your table.
The main problem is if you have some duplicates with the same timestamp.
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How to get CRON to call in the correct PATHs
...our own environment variables to the local crontab by defining them at the top of your crontab.
Here's a quick fix to prepend $PATH to the current crontab:
# echo PATH=$PATH > tmp.cron
# echo >> tmp.cron
# crontab -l >> tmp.cron
# crontab tmp.cron
The resulting crontab will look s...
“unrecognized selector sent to instance” error in Objective-C
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This was the top Google answer for this issue, but I had a different cause/result - I thought I'd add in my two cents in case others stumble across this problem.
I had a similar issue just this morning. I found that if you right click ...
How do you pass custom environment variable on Amazon Elastic Beanstalk (AWS EBS)?
...c. However you are correct Tomcat variables are passed as properties. (See top of linked page.)
– Chloe
Aug 3 '18 at 3:12
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Chrome ignores autocomplete=“off”
...play:none">
<input type="password" style="display:none">
To the top of the <form> and the case was resolved.
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HashMap with multiple values under the same key
...m Apache Commons. Take a look at the All Known Implementing Classes at the top of the page for specialized implementations.
Example:
HashMap<K, ArrayList<String>> map = new HashMap<K, ArrayList<String>>()
could be replaced with
MultiValuedMap<K, String> map = new M...
Favorite (Clever) Defensive Programming Best Practices [closed]
...t. When I add the case AccountType.MyNewAccountType:, the horrible crash stops...until I add yet another account type and forget to update the cases here.
(Yes, polymorphism is probably better here, but this is just an example off the top of my head.)
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“#include” a text file in a C program as a char[]
...ne 2
Line 3
Line 4
Line 5
Line 6)"
So there must only be a prefix at the top of the file and a suffix at the end of it. Between it you can do what you want, no special escaping is necessary as long as you don't need the character sequence )". But even this can work if you specify your own custom d...
How to configure socket connect timeout
...nnect). But in case if the connection takes longer, the BeginConnect will stop anyway. Or, does BeginConnect internally waits forever? I have a very slow connection when sometimes it's required for up to 30-40 seconds to connect, and timeouts at 21st second occur very often.
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Detecting when a div's height changes using jQuery
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This not being the top voted answer on here is a tragedy. This really works 100%.
– Jimbo Jonny
May 27 '16 at 8:47
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