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Can someone explain mappedBy in JPA and Hibernate?
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By specifying the @JoinColumn on both models you don't have a two way relationship. You have tw...
What happens when a computer program runs?
...r on some systems (see Billy O'Neal's answer below for more details on Win32).
Other systems can be very different. DOS, for instance, ran in real mode, and its memory allocation when running programs looked much differently:
+-----------+ top of memory
| extended | above the high memory area,...
MySQL select one column DISTINCT, with corresponding other columns
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Square retrofit server mock for testing
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Mock Retrofit 2.0 Requests for Testing
As the old mechanisms like creating MockClient class and implementing it from Client are not working anymore with Retrofit 2.0, here I describe a new way of doing that. All what you need to do now is...
Is the Scala 2.8 collections library a case of “the longest suicide note in history”? [closed]
...la collections library re-implementation which is coming in the imminent 2.8 release. Those familiar with the library from 2.7 will notice that the library, from a usage perspective, has changed little. For example...
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Ruby on Rails: How can I revert a migration with rake db:migrate?
...nt to revert.
eg. if you want to revert a migration with file name 3846656238_create_users.rb
rake db:migrate:down VERSION=3846656238
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How to show current year in view?
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<%= Time.current.year %>
http://pleac.sourceforge.net/pleac_ruby/datesandtimes.html
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TCP 的那些事儿（下） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...样的：
1）首先，先采样RTT，记下最近好几次的RTT值。
2）然后做平滑计算SRTT（ Smoothed RTT）。公式为：（其中的 α 取值在0.8 到 0.9之间，这个算法英文叫Exponential weighted moving average，中文叫：加权移动平均）
SRTT = ( α * ...
Regular expression for exact match of a string
...tch two passwords with regular expression. For example I have two inputs "123456" and "1234567" then the result should be not match (false). And when I have entered "123456" and "123456" then the result should be match (true).
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在 App Inventor 2 中使用图像 · App Inventor 2 中文网
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在 App Inventor 2 中使用图像
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在 App Inventor 2 中使用图像，避免一些常见的陷阱！
Out of memory errors
An example of misusing large images
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