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“Prevent saving changes that require the table to be re-created” negative effects
...ll of the questions raised by the OP, and those questions are the ones I'm interested in, actually. In particular Are there any negative effects / possible drawbacks of doing this? and If so, is the table copy a 100% exact replica of the source table?. Do you have any information regarding those que...
How do you echo a 4-digit Unicode character in Bash?
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Quick one-liner to convert UTF-8 characters into their 3-byte format:
var="$(echo -n '☠' | od -An -tx1)"; printf '\\x%s' ${var^^}; echo
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mmap() vs. reading blocks
...r if you know you can share it with other processes (MAP_SHARED isn't very interesting if there is no actual sharing). Read files normally if you access data sequentially or discard it after reading. And if either method makes your program less complex, do that. For many real world cases there's ...
How can I determine what font a browser is actually using to render some text?
...n pasting from Firefox (where for "웃" Firefox's "Apple SD Gothic Neo" is converted into "AppleMyungjo" on pasting), but works well for Safari and Chrome:
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Best way to initialize (empty) array in PHP
...ul if you wanna create your array in an object with properties pattern and convert it to array in the end.
– Jomar Sevillejo
Dec 8 '15 at 8:30
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How to drop a PostgreSQL database if there are active connections to it?
...he pid values you want to kill, then issue SELECT pg_terminate_backend(pid int) to them.
PostgreSQL 9.2 and above:
SELECT pg_terminate_backend(pg_stat_activity.pid)
FROM pg_stat_activity
WHERE pg_stat_activity.datname = 'TARGET_DB' -- ← change this to your DB
AND pid <> pg_backend_pid();...
Why is Java's boolean primitive size not defined?
..., but due to
alignment rules it may consume much
more. IMHO it is more interesting to
know that a boolean[] will consume one
byte per entry and not one bit,plus
some overhead due to alignment and for
the size field of the array. There are
graph algorithms where large fields of
bits a...
Is “ ” a replacement of “ ”?
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Is there any change to convert these numeric entity referenece into the character enitiy reference?
– user2140111
Sep 4 '15 at 10:41
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PHP Pass by reference in foreach [duplicate]
...ill become a normal variable (Since no one else is pointing to $a[0] it is converted to a normal variable. PHP is smart enough to make it a normal variable when no one else is pointing towards it)
This is what happens in the first loop
foreach ($a as &$v) {
}
After the last iteration $a[3...
Create PostgreSQL ROLE (user) if it doesn't exist
...catch only this one error. As other answers mentioned it is a good idea to convert fatal error to simple notice. Other PostgreSQL IF NOT EXISTS commands adds , skipping into their message, so for consistency I'm adding it here too.
Here is full SQL code for simulation of CREATE ROLE IF NOT EXISTS w...