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Possible to do a MySQL foreign key to one of two possible tables?
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What you're describing is called Polymorphic Associations. That is, the "foreign key" column contains an id value that must exist in one of a set of target tables. Typically the target tables are related in some way, such as being instances of some c...
Download file of any type in Asp.Net MVC using FileResult?
I've had it suggested to me that I should use FileResult to allow users to download files from my Asp.Net MVC application. But the only examples of this I can find always has to do with image files (specifying content type image/jpeg).
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OpenJDK availability for Windows OS [closed]
...After some research, I've noticed that you're working for Red Hat, but I really wish something a tad more official would show up first on Google, rather than an individual's effort. Perhaps, that ojdkbuild github page and group could also look a bit more official. I'll definitely create an issue tom...
What package naming convention do you use for personal/hobby projects in Java?
...ge names for personal projects. I assume because this is because this is really a matter of personal taste.
12 Answers
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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
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MIT App Inventor is a block-based event-driven programming tool that allows everyone, especially novices, to start programming and building fully functional apps for Android devices. Compared to traditional text programming with Android Studio, it has limited features. We enabled App Inventor ...
Do DOM tree elements with ids become global variables?
...ts’ are added as apparent properties of the document object. This is a really bad idea, as it allows element names to clash with real properties of document.
IE made the situation worse by also adding named elements as properties of the window object. This is doubly bad in that now you have to av...
Locking pattern for proper use of .NET MemoryCache
...t collection that has thread safe reads but non-thread safe writes (almost all of classes under the System.Collections namespace is like that).
Here is how I would do it using ReaderWriterLockSlim to protect access. You need to do a kind of "Double Checked Locking" to see if anyone else created the...
LVN_ITEMCHANGED通知会响应多次的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
LVN_ITEMCHANGED通知会响应多次的问题CListCtrl LVN_ITEMCHANGED通知会响应多次（三次）的问题及替代方案。
#define LVIF_STATE 0x0008
#define LVIS_FOCUSED 0x0001
#define LVIS_SELECTED 0x0002
// 在CListCtrl派生类中响应LVN_ITEMCHANG...
解决xrdp登陆不上的问题：xrdp session: Login failed for display 0 - 操...
...决xrdp登陆不上的问题：xrdp session: Login failed for display 0xrdp_Login_failed_for_display_0Xrdp登陆不上报错如下：原因及解决方法：1、网上大部分内容说是用户名密码不对导致，的确密码不对会报这个错误，但是有些时候当你确认用户名密...
解决xrdp登陆不上的问题：xrdp session: Login failed for display 0 - 操...
...决xrdp登陆不上的问题：xrdp session: Login failed for display 0xrdp_Login_failed_for_display_0Xrdp登陆不上报错如下：原因及解决方法：1、网上大部分内容说是用户名密码不对导致，的确密码不对会报这个错误，但是有些时候当你确认用户名密...