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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...
Comparing date ranges
... may find the Snodgrass book (http://www.cs.arizona.edu/people/rts/tdbbook.pdf) useful: it pre-dates mysql but the concept of time hasn't changed ;-)
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Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...老牌的脚本编程语言了，Python这些年也成了一些linux发行版的预置解释器。
编译型语言，只要有解释器，也可以用作脚本编程，如C shell是内置的（/bin/csh），Java有第三方解释器Jshell，Ada有收费的解释器AdaScript。
如下是一个PHP S...
HTML encoding issues - “” character showing up instead of “ ”
...r reason I'm not sure. It generates a bunch of HTML that gets turned into PDF reports by ActivePDF.
8 Answers
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How to reorder data.table columns (without copying)
...this in the first item here: datatable.r-forge.r-project.org/datatable-faq.pdf
– Frank
Dec 2 '15 at 21:51
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扒了一下源码，ESP8285接入App Inventor有4种玩法，第3种最香 - AI 助手 - ...
...发ESP8285专用扩展
更多教程和扩展下载：App Inventor 2 中文网
有问题？在评论区留言，我来解答。
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...
Replacement for “rename” in dplyr
... function in dplyr (yet): http://cran.rstudio.org/web/packages/dplyr/dplyr.pdf
The function below works (almost) the same if you don't want to load both plyr and dplyr
rename <- function(dat, oldnames, newnames) {
datnames <- colnames(dat)
datnames[which(datnames %in% oldnames)] <- ne...
How to remove outliers from a dataset
...ed "outliers"!): https://cran.r-project.org/web/packages/outliers/outliers.pdf
if you go through it you see different ways of removing outliers and among them I found rm.outlier most convenient one to use and as it says in the link above:
"If the outlier is detected and confirmed by statistical tes...
Is there something like RStudio for Python? [closed]
...ipt (a .py file including only the source code)
static html (and therefore pdf as well)
You can even share your notebooks online with others using the nbviewer service, where people publish whole books. Furthermore, GitHub renders your .ipynb files. You can publish your Jupyter Notebooks as reprod...