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How to output a multiline string in Bash?
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/bin/echo is often different from one OS to another and different from Bash's builtin echo.
– Paused until further notice.
Jun 10 '12 at 17:01
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Repository Pattern Step by Step Explanation [closed]
...ects are persisted. All of the knowledge of persistence, including mapping from tables to objects, is safely contained in the repository.
Very often, you will find SQL queries scattered in the codebase and when you come to add a column to a table you have to search code files to try and find usages...
fork() branches more than expected?
...However, what printf() really does is buffer its output. So the first dot from when there were only two processes does not appear when written. Those dots remain in the buffer—which is duplicated at fork(). It is not until the process is about to exit that the buffered dot appears. Four proces...
What is [Serializable] and when should I use it?
...bject to a remote application by means of a Web Service, passing an object from one domain to another, passing an object through a firewall as an XML string, or maintaining security or user-specific information across applications.
Apply SerializableAttribute to a type to indicate that instances of ...
MySQL Error 1215: Cannot add foreign key constraint
... Explosion Pill's answer covers the basics. You want to make sure to start from there. However, there are more, much more subtle cases to look out for:
For example, when you try to link up PRIMARY KEYs of different tables, make sure to provide proper ON UPDATE and ON DELETE options. E.g.:
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PRIM...
How do I reference a Django settings variable in my models.py?
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Try with this: from django.conf import settings then
settings.VARIABLE to access that variable.
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What are POD types in C++?
...fsets are applied when casting to a base or derived class. So, if you cast from a POD base class pointer to a non-POD derived class, you may still encounter an adjustement.
– MSalters
Sep 29 '08 at 12:05
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Executors.newCachedThreadPool() versus Executors.newFixedThreadPool()
...s that have not been used for
sixty seconds are terminated and
removed from the cache. Thus, a pool
that remains idle for long enough will
not consume any resources. Note that
pools with similar properties but
different details (for example,
timeout parameters) may be created
using T...
Do spurious wakeups in Java actually happen?
...nd friends could not return EINTR, but return zero if spuriously woken up? From: pubs.opengroup.org/onlinepubs/7908799/xsh/… "These functions will not return an error code of [EINTR]."
– gub
Aug 11 '14 at 17:57
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How does origin/HEAD get set?
...anch, and a git status will show me how far ahead or behind my branch is from origin, but I'm surprised that origin/HEAD still points at origin/master , and not origin/<branchname>
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