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in a “using” block is a SqlConnection closed on return or exception?
...plicitly .Commit or .Rollback transactions in the catch. This is both more readable and explicit, and permits you to commit if that makes sense given the type of the exception. (Transactions implicitly roll back on conn.Close if not committed.).
– Chris
May 2 '...
Reason to Pass a Pointer by Reference in C++?
...the user of that class could get a pointer to the internal data buffer and read/write to it, but it cannot – for example – free that buffer using delete or rebind that pointer to some other place in memory? Or did I get it wrong?
– BarbaraKwarc
Aug 4 '16 at...
Differences between C++ string == and compare()?
I just read some recommendations on using
9 Answers
9
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How do I partially update an object in MongoDB so the new object will overlay / merge with the exist
... with the contents of another document, but only the fields that are not already present, and completely ignore the fields that are already set (even if to another value).
There is no way to do that in a single command.
You have to query the document first, figure out what you want to $set and the...
How do I parse XML in Python?
... memory usage are an issue. It has very little overhead compared to simply reading in the file using readlines.
The relevant metrics can be found in the table below, copied from the cElementTree website:
library time space
xml.dom.minidom (Python 2.1) 6.3 s 80000K
g...
What is your favorite C programming trick? [closed]
...
While reading Quake 2 source code I came up with something like this:
double normals[][] = {
#include "normals.txt"
};
(more or less, I don't have the code handy to check it now).
Since then, a new world of creative use of th...
Why are global variables evil? [closed]
...ll make testing harder as well.
Furthermore, if you consider other people reading your code (open-source community, colleagues etc) they will have a hard time trying to understand where the global variable is being set, where has been changed and what to expect from this global variable as opposed ...
Truncate all tables in a MySQL database in one command?
...
Drop (i.e. remove tables)
mysql -Nse 'show tables' DATABASE_NAME | while read table; do mysql -e "drop table $table" DATABASE_NAME; done
Truncate (i.e. empty tables)
mysql -Nse 'show tables' DATABASE_NAME | while read table; do mysql -e "truncate table $table" DATABASE_NAME; done
...
How to do relative imports in Python?
...countered this problem many times while doing relative imports. And, after reading all the previous answers, I was still not able to figure out how to solve it, in a clean way, without needing to put boilerplate code in all files. (Though some of the comments were really helpful, thanks to @ncoghlan...
JMS and AMQP - RabbitMQ
...sed on the Java Enterprise Edition (Java EE) to create, send, receive, and read messages. It allows the communication between different components of a distributed application to be loosely coupled, reliable, and asynchronous.
Now (from Wikipedia):
The Advanced Message Queuing Protocol (AMQP) i...