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“open/close” SqlConnection or keep open?

I have my business-logic implemented in simple static classes with static methods. Each of these methods opens/closes SQL connection when called: ...
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sed command with -i option (in-place editing) works fine on Ubuntu but not Mac [duplicate]

I know nothing about Sed but need this command (which works fine on Ubuntu) to work on a Mac OSX: 4 Answers ...
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to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh

To clarify the purpose of this question: I know HOW to create complicated views with both subviews and using drawRect. I'm trying to fully understand the when's and why's to use one over the other. ...
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Why does struct alignment depend on whether a field type is primitive or user-defined?

In Noda Time v2, we're moving to nanosecond resolution. That means we can no longer use an 8-byte integer to represent the whole range of time we're interested in. That has prompted me to investigate the memory usage of the (many) structs of Noda Time, which has in turn led me to uncover a slight ...
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Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes

What exactly are process and update in PrimeFaces p:commandXxx components and execute and render in f:ajax tag? ...
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Is MATLAB OOP slow or am I doing something wrong?

I'm experimenting with MATLAB OOP , as a start I mimicked my C++'s Logger classes and I'm putting all my string helper functions in a String class, thinking it would be great to be able to do things like a + b , a == b , a.find( b ) instead of strcat( a b ) , strcmp( a, b ) , retrieve first...
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When do you use map vs flatMap in RxJava?

When do you use map vs flatMap in RxJava ? 10 Answers 10 ...
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Renaming the current file in Vim

How should I rename my current file in Vim? 21 Answers 21 ...
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What Every Programmer Should Know About Memory?

I am wondering how much of Ulrich Drepper's What Every Programmer Should Know About Memory from 2007 is still valid. Also I could not find a newer version than 1.0 or an errata. ...
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LAST_INSERT_ID() MySQL

I have a MySQL question that I think must be quite easy. I need to return the LAST INSERTED ID from table1 when I run the following MySql query: ...