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How do I create a unique ID in Java? [duplicate]
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Create a UUID.
String uniqueID = UUID.randomUUID().toString();
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The JPA hashCode() / equals() dilemma
... it. I let JPA implementation to change the field instead of the property.
UUID solution seems to be overkill. Why UUID if you have natural business id? I would after all set the uniqueness of the business id in the database. Why having THREE indexes for each table in the database then?
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泡在Stack Overflow答题30天 - 创意 - 清泛网 - 专注C/C++及内核技术
...是如何使用Stack Overflow的话，我的答案就是：打开网页，搜索问题，查看Stack Overflow的搜索结果，参...想法的萌芽
如果非要总结下我多年来是如何使用Stack Overflow的话，我的答案就是：打开网页，搜索问题，查看Stack Overflow的搜...
Linux进程与线程总结 [推荐] - C/C++ - 清泛网 - 专注C/C++及内核技术
...即一个信号量最多可以被锁住n次，其中n是信号量产生时指定的，当某线程试图对该信号量进行第n+1次加锁，则该线程将会发生阻塞，直到前n次加锁中任意一次释放该信号量。信号量可以看作是容量为1的特殊的互斥量。另外，...
nsis指定默认安装路径，记住上次安装路径 - 更多技术 - 清泛网 - 专注C/C++...
nsis指定默认安装路径，记住上次安装路径!define PRODUCT_DEFAULT_PATH "C: Test"....InstallDir "${PRODUCT_DEFAULT_PATH}"InstallDirRegKey HKLM "Software Microsoft Windo...!define PRODUCT_DEFAULT_PATH "C:\Test"
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InstallDir "${PRODUCT_DEFAULT_PATH}"
InstallDirRegKey HKLM "Softwar...
How to create GUID / UUID?
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UUIDs (Universally Unique IDentifier), also known as GUIDs (Globally Unique IDentifier), according to RFC 4122, are identifiers designed to provide certain uniqueness guarantees.
While it is possible to implement an RFC-comp...
How can I generate a unique ID in Python? [duplicate]
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Perhaps uuid.uuid4() might do the job. See uuid for more information.
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UIDevice uniqueIdentifier deprecated - What to do now?
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A UUID created by CFUUIDCreate is unique if a user uninstalls and re-installs the app: you will get a new one each time.
But you might want it to be not unique, i. e. it should stay the same when the user uninstalls and re-ins...
UUID max character length
We are using UUID as primary key for out oracle DB, and trying to determine an appropriate max character length for the VARCHAR. Apparently this is 36 characters but we have noticed UUID'S generated which are longer than this - up to 60 characters in length.
Does anyone know a suitable max char leng...