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MAC addresses in JavaScript
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@Michael Wikipedia lists several UUID implementations
– Vincent Robert
Dec 11 '13 at 10:41
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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
... not correct. In latest Postgres this leads also to the message like "Key (uuid)=(3a533772-07ac-4e76-b577-27a3878e2222) is duplicated. Query failed" if you have a value that is not unique...
– Strinder
Dec 3 '15 at 7:39
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When to use CouchDB over MongoDB and vice versa
...pty value is translated to a special prefix (like null:) concatenated to a uuid. This is a real headache, because one has to take care of transforming to/from the empty values when writing/quering/reading. A major nuisance.
I have never used server side jav
ssl证书申请报错：challenge = [c for c in authorization[\'challenges\']...
... index out of range
原因：ACME不支持 *.xxx.com 通用域名，必须指定 a.xxx.com, b.xxx.com（DNS-01 challenge支持通配符）
参考：https://github.com/diafygi/acme-tiny/issues/213
acme ssl dns
Using querySelector with IDs that are numbers
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UUIDs can start by a number.
– Alfonso Nishikawa
Mar 15 '18 at 12:54
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JPA EntityManager: Why use persist() over merge()?
...e was no field that JPA was generating for me--the primary key field was a UUID that I set myself. I switched to em.persist(myEntityObject) and got just INSERT statements then.
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How do I migrate an SVN repository with history to a new Git repository?
....com/myrepo/<branchname/trunk>@<RevisionNumber> <Repository UUID>)
If a user name is not found, update your users.txt file then:
cd dest_dir-tmp
git svn fetch
You might have to repeat that last command several times, if you have a large project, until all of the Subversion comm...
Surrogate vs. natural/business keys [closed]
...d to the EOF on disk. If you use less sequential data such as text or GUID(UUID), there will be a lot more disk IO and effort to balance the index, I think that's kind of big difference
– Jin
May 2 '16 at 20:42
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Best Practices for securing a REST API / web service [closed]
...e /me/orders instead of /user/654321/orders.
Don't auto-increment IDs. Use UUID instead.
If you are parsing XML files, make sure entity parsing is not enabled to avoid XXE (XML external entity attack).
If you are parsing XML files, make sure entity expansion is not enabled to avoid Billion Laughs/XM...