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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
...
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...
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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Difference between partition key, composite key and clustering key in Cassandra?
...wo int,
k_clust_one text,
k_clust_two int,
k_clust_three uuid,
data text,
PRIMARY KEY((k_part_one, k_part_two), k_clust_one, k_clust_two, k_clust_three)
);
Behind these names ...
The Partition Key is responsible for data distribution across your nodes.
The C...
Performant Entity Serialization: BSON vs MessagePack (vs JSON)
...red with MessagePack.
BSON has special types like "ObjectId", "Min key", "UUID" or "MD5" (I think these types are required by MongoDB). These types are not compatible with JSON. That means some type information can be lost when you convert objects from BSON to JSON, but of course only when these sp...
Amazon S3 direct file upload from client browser - private key disclosure
...image/jpeg" /><br />
<input type="hidden" name="x-amz-meta-uuid" value="14365123651274" />
Tags for File: <input type="input" name="x-amz-meta-tag" value="" /><br />
<input type="hidden" name="AWSAccessKeyId" value="AKIAIOSFODNN7EXAMPLE" />
<input ...