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What is the difference between Builder Design pattern and Factory Design pattern?
What is the difference between the Builder design pattern and the Factory design pattern?
27 Answers
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What is the IntelliJ shortcut to create a local variable?
... This is the Introduce Variable refactoring. By default, select some text, and then hit Ctrl + Alt + V (for Mac: ⌘+⌥+V). If the expression is incomplete or invalid, IntelliJ will still make a good guess about what you meant and try to fix it for you.
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msbuild.exe staying open, locking files
...sbuild (.NET 4). I have a strange issue in that after a build is complete (and it doesn't seem to matter if it was a successful build or not), msbuild.exe stays open, and locks one of the files, which means every time TeamCity tries to clear its work directory, it fails, and can't continue.
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How can I combine multiple rows into a comma-delimited list in Oracle? [duplicate]
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insert into countries values ('Albania');
insert into countries values ('Andorra');
insert into countries values ('Antigua');
SELECT SUBSTR (SYS_CONNECT_BY_PATH (country_name , ','), 2) csv
FROM (SELECT country_name , ROW_NUMBER () OVER (ORDER BY country_name ) rn,
COUN...
Token Authentication vs. Cookies
What is the difference between token authentication and authentication using cookies?
8 Answers
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Why is the use of alloca() not considered good practice?
...memory. Freeing of memory allocated through malloc() is a major headache and if somehow missed leads to all sorts of memory problems.
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Is there a timeout for idle PostgreSQL connections?
...L database, see: How do I detach all other users from a postgres database? and How to drop a PostgreSQL database if there are active connections to it? . The latter shows a better query.
For setting timeouts, as @Doon suggested see How to close idle connections in PostgreSQL automatically?, which a...
What's a standard way to do a no-op in python?
I often find myself writing if / elif / else constructs in python, and I want to include options which can occur, but for which the corresponding action is to do nothing. I realise I could just exclude those if statements, but for readability I find it helps to include them all, so that if you are l...
Add 2 hours to current time in MySQL?
...courses
WHERE DATE_ADD(NOW(), INTERVAL 2 HOUR) > start_time
See Date and Time Functions for other date/time manipulation.
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Cron jobs and random times, within given hours
I need the ability to run a PHP script 20 times a day at completely random times. I also want it to run only between 9am - 11pm.
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