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App Inventor 2 DynamicComponents 拓展:动态创建AI2组件对象 · App Inventor 2 中文网

... 通过 JSON 字符串创建组件。请参阅Wiki,了解如何创建自己的模板。 从屏幕和组件列表中移除指定 ID 的组件。由于该组件已被删除,因此你可以再次使用该 ID...
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Howto: Clean a mysql InnoDB storage engine?

Is it possible to clean a mysql innodb storage engine so it is not storing data from deleted tables? 2 Answers ...
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Gem::LoadError for mysql2 gem, but it's already in Gemfile

...upgrading to rails 4.2.4 (also with rails 4.1.5) try using this version of mysql2: gem 'mysql2', '~> 0.3.18' Apparently mysql2 isn't still compatible with newer version of rails because rails 4.2.4 is pretty new as the time of answering this question by me 8 September 2015 so use the above lin...
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Using MySQL with Entity Framework [closed]

Can't find anything relevant about Entity Framework/MySQL on Google so I'm hoping someone knows about it. 10 Answers ...
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How to select the nth row in a SQL database table?

... http://troels.arvin.dk/db/rdbms/#select-limit. Basically, PostgreSQL and MySQL supports the non-standard: SELECT... LIMIT y OFFSET x Oracle, DB2 and MSSQL supports the standard windowing functions: SELECT * FROM ( SELECT ROW_NUMBER() OVER (ORDER BY key ASC) AS rownumber, columns F...
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What is the MySQL JDBC driver connection string?

I am new to JDBC and I am trying to make a connection to a MySQL database. I am using Connector/J driver, but I cant find the JDBC connection string for my Class.forName() method. ...
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为什么你有10年经验,但成不了专家? - 杂谈 - 清泛网 - 专注C/C++及内核技术

...有10年经验,但成不了专家?转载自微信公众号李叫兽。如何成为一个领域的专家?有人说主要靠经验,有人说靠天赋,但是大量的研究发现:不论是经验还是天赋,都不是成为...如何成为一个领域的专家? 有人说主要靠经验...
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推动“一带一路”IT产业怎么走 - 资讯 - 清泛网 - 专注C/C++及内核技术

...味着基础设施建设的提速,还有科技和文化的互联互通。如何把握机会借助“一带一路”走出去,如何在IT产业更为发达的地区站稳脚跟并抓住欠发达地区的市场,这成为目前中国IT企业必须解决的问题。“一带一路”倡议对其...
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PHP优化杂烩 - 更多技术 - 清泛网 - 专注C/C++及内核技术

PHP优化杂烩讲 PHP 优化的文章往往都是教大家如何编写高效的代码,本文打算从另一个角度来讨论问题,教大家如何配置高效的环境,如此同样能够达到优...讲 PHP 优化的文章往往都是教大家如何编写高效的代码,本文打算从另...
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Mac OS X 入门操作常见问题集锦(持续更新) - 更多技术 - 清泛网 - 专注C/...

Mac OS X 入门操作常见问题集锦(持续更新)如何截图:shift + command + 3 截整屏shift + command + 4 截窗口(默认png,并保存到桌面)shift + command + Ctrl + 4 如何截图: shift + command + 3 截整屏 shift + command + 4 截窗口(默认png,并保存...