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Does MySQL foreign_key_checks affect the entire database?
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https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html
According to this, FOREIGN_KEY_CHECKS is "Both" for scope. This means it can be set for session:
SET FOREIGN_KEY_CHECKS=0;
or globally:
SET GLOBAL FOREIGN_KEY_CHECKS=0;
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How to list all installed packages and their versions in Python?
... can simply call this:
pip freeze
It will also include version numbers for the installed packages.
Update
pip has been updated to also produce the same output as pip freeze by calling:
pip list
Note
The output from pip list is formatted differently, so if you have some shell script that par...
Clearing a string buffer/builder after loop
... use the delete method as follows:
StringBuffer sb = new StringBuffer();
for (int n = 0; n < 10; n++) {
sb.append("a");
// This will clear the buffer
sb.delete(0, sb.length());
}
Another option (bit cleaner) uses setLength(int len):
sb.setLength(0);
See Javadoc for more info:
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Are PHP include paths relative to the file or the calling code?
...should the relative path to C.PHP be in relation to the location of B.PHP, or to the location of A.PHP? That is, does it matter which file the include is called from, or only what the current working directory is- and what determines the current working directory?
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Pagination in a REST web application
This is a more generic reformulation of this question (with the elimination of the Rails specific parts)
13 Answers
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List of standard lengths for database fields
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W3C's recommendation:
If designing a form or database that will accept names from people
with a variety of backgrounds, you should ask yourself whether you
really need to have separate fields for given name and family name.
… Bear in mind that names in...
Does every web request send the browser cookies?
...-- secure, httponly, not expired, etc) hold, then the cookie will be sent for every request.
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Prevent HTML5 video from being downloaded (right-click saved)?
...cking and Save As. But then they could just disable JS and get around this or find the video source via the browser's debugger. Plus this is bad UX. There are lots of legitimate things in a context menu than just Save As.
You could also use custom video player libraries. Most of them implement vide...
How can I process each letter of text using Javascript?
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If the order of alerts matters, use this:
for (var i = 0; i < str.length; i++) {
alert(str.charAt(i));
}
If the order of alerts doesn't matter, use this:
var i = str.length;
while (i--) {
alert(str.charAt(i));
}
var...
How do I list all cron jobs for all users?
Is there a command or an existing script that will let me view all of a *NIX system's scheduled cron jobs at once? I'd like it to include all of the user crontabs, as well as /etc/crontab , and whatever's in /etc/cron.d . It would also be nice to see the specific commands run by run-parts in /e...