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Fastest Way of Inserting in Entity Framework
...he context after SaveChanges and create a new one. This clears the context from all entites, SaveChanges doesn't do that, the entities are still attached to the context in state Unchanged. It is the growing size of attached entities in the context what slows down the insertion step by step. So, it i...
Getting the difference between two sets
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Try this
test2.removeAll(test1);
Set#removeAll
Removes from this set all of its elements that are contained in the specified collection (optional operation). If the specified collection is also a set, this operation effectively modifies this set so that its value is the asymmetri...
Importing CSV with line breaks in Excel 2007
...have differently depending on whether a CSV file is imported by opening it from the File->Open menu or by double-clicking on the file in Explorer.
I have a CSV file that is in UTF-8 encoding and contains newlines in some cells. If I open this file from Excel's File->Open menu, the "import CSV...
The Definitive C Book Guide and List
...s C in 5 levels (encounter, acquaintance, cognition, experience, ambition) from beginning C to advanced C. It covers C11 and C17, including threads and atomic access, which few other books do. Not all compilers recognize these features in all environments.
C Interfaces and Implementations - David ...
What is the best place for storing uploaded images, SQL database or disk file system? [closed]
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please add a few more notes on security/preventing files from destroying your web site
– Andrew
Jan 26 '17 at 17:43
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Get keys from HashMap in Java
...ke BidiMap (a map that allows bidirectional lookup between key and values) from Apache's Commons Collections - also be aware that several different keys could be mapped to the same value.
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How to avoid “cannot load such file — utils/popen” from homebrew on OSX
...Ruby.framework/Versions/Current
This will force Homebrew to use Ruby 1.8 from the system's installation.
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Using the rJava package on Win7 64 bit with R
...windows-i586.exe and jdk-8u172-windows-x64.exe and then the binary package from CRAN:
install.packages("rJava")
The binary package from CRAN should pick up on the jvm by itself. Experts only: to build rJava from source, you need the --merge-multiarch flag:
install.packages('rJava', type = 'sour...
Convert RGB to RGBA over white
... @templatetypedef: Converting te lowest component to alpha is scaling from the range 0..255 to 0..1, and inverting. Using 1.0 - 152 / 255 would also work. Converting the color components is simply scaling from n..255 to 0..255 where n is the lowest component.
– Guffa
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Append integer to beginning of list in Python [duplicate]
... @KeminZhou I'd prefer the name "prepend" as it follows naturally from "append" as "push_front" follows naturally from "push_back".
– god of llamas
Nov 15 '16 at 0:29
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