大约有 237 项符合查询结果（耗时：0.0192秒） [XML]
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
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...
Using an RDBMS as event sourcing storage
...sights on some of the choices we made.
Firstly we found (even with unique UUIDs/GUIDs instead of integers) for many reasons sequential IDs occur for strategic reasons, thus just having an ID wasn't unique enough for a key, so we merged our main ID key column with the data/object type to create what...
【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
...务如下图所示，主机成功获取到从机的服务，例如获取到UUID为0xFFF0的Services，该Service有两个特征值，分别是具有读写属性的0xFFF1，以及具有通知属性的0xFFF2。读写属性是指主机可以读写该特征值的内容。而通知属性是指从机可...
What is the maximum possible length of a query string?
... backend engineers that we won't accept a list of one hundred 36 character UUIDs in the queryParams of a GET request. Thanks!
– Mordred
Jan 15 at 22:37
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