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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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初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...必须是INT。
flags字段的类型必须是INT。
说明：从5.6.14开始，key_columns类型可以是INTEGER。
实战
让我们以一个用户登录的例子来检验一下学习成果：
首先在测试数据库创建一个用户表：
USE `test`
CREATE TABLE `users` (
`id` I...
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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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...
C++应用程序添加VBScript和JavaScript支持 - C/C++ - 清泛网 - 专注IT技能提升
...C++程序中调用JavaScript及VBScript。效果截图：
源码点此下载。
Introduction
I am always amazed to see how the script control (msscript.ocx) is fun to use and at the same time how C++ developers reacted when it's time to use. Maybe the extension (.ocx) make them feel, it's vis...
C++应用程序添加VBScript和JavaScript支持 - C/C++ - 清泛网 - 专注IT技能提升
...C++程序中调用JavaScript及VBScript。效果截图：
源码点此下载。
Introduction
I am always amazed to see how the script control (msscript.ocx) is fun to use and at the same time how C++ developers reacted when it's time to use. Maybe the extension (.ocx) make them feel, it's vis...
C++应用程序添加VBScript和JavaScript支持 - C/C++ - 清泛网 - 专注IT技能提升
...C++程序中调用JavaScript及VBScript。效果截图：
源码点此下载。
Introduction
I am always amazed to see how the script control (msscript.ocx) is fun to use and at the same time how C++ developers reacted when it's time to use. Maybe the extension (.ocx) make them feel, it's vis...
C++应用程序添加VBScript和JavaScript支持 - C/C++ - 清泛网 - 专注IT技能提升
...C++程序中调用JavaScript及VBScript。效果截图：
源码点此下载。
Introduction
I am always amazed to see how the script control (msscript.ocx) is fun to use and at the same time how C++ developers reacted when it's time to use. Maybe the extension (.ocx) make them feel, it's vis...