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Specifying an Index (Non-Unique Key) Using JPA
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= Specifications =
JPA 2.1+: javax.persistence.Index (or see JSR-000338 PDF, p. 452, item 11.1.23)
The JPA @Index annotation can only be used as part of another annotation like @Table, @SecondaryTable, etc.:
@Table(indexes = { @Index(...) })
JDO 2.1+: javax.jdo.annotations.Index
= ORM Framewo...
Comment out text in R Markdown (Rmd file)
...t because knitr is not responsible for rendering the document into html or pdf. I think the HTML comment characters are only dealt with by pandoc/rmarkdown after knitting.
– randy
Jul 12 '19 at 21:57
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Why does Google +1 record my mouse movements? [closed]
...nd Agichtein from CHI 2010 http://www.mathcs.emory.edu/~qguo3/wip287-guo11.pdf can provide further ideas on why Google is doing that.
Apparently mouse movements is a rough proxy for eye movement and allows people to approximate eye tracking results.
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Convert SVG to image (JPEG, PNG, etc.) in the browser
...anvas, according to these instructions: Capture HTML Canvas as gif/jpg/png/pdf?
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深入理解 x86/x64 的中断体系 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
... ISR 能正常工作了，我提供了完整的示例源码和磁盘映像下载：interrupt_demo
2. 保护模式下的中断机制
引入保护模式后，情形变得复杂多了，实施了权限控制机制，为了支持权限的控制增添了几个重要的数据结构，下面是与中...
How do I handle newlines in JSON?
...ion, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf:
A string is a sequence of Unicode code points wrapped with quotation marks
(U+0022). All characters may be placed within the quotation marks except for the
characters that must be escaped: quotation mark (U+0...
What are the benefits of functional programming? [closed]
...gramming Matters
http://www.cs.kent.ac.uk/people/staff/dat/miranda/whyfp90.pdf
Abstract
As software becomes more and more complex, it is more and
more important to structure it well. Well-structured software is easy
to write and to debug, and provides a collection of modules that can
be reused to r...
Where can I get a “useful” C++ binary search algorithm?
... Good link; and also good link in the link: lafstern.org/matt/col1.pdf, which describes how lookups implemented with a sorted vector, rather than set (though both are log(N)), have significantly better constants of proportionality and are ~twice as fast (the disadvantage being a larger INSER...
What is the reason behind cbegin/cend?
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From http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1674.pdf:
so that a programmer can directly obtain a const_iterator from even a
non-const container
They gave this example
vector<MyType> v;
// fill v ...
typedef vector<MyType>::iterator iter;
for( iter it =...
Append value to empty vector in R?
...discusses growing vectors in circle 2 burns-stat.com/pages/Tutor/R_inferno.pdf
– Tjebo
Jun 6 at 17:01
just moment, I a...