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What's the difference between findAndModify and update in MongoDB?
I'm a little bit confused by the findAndModify method in MongoDB. What's the advantage of it over the update method? For me, it seems that it just returns the item first and then updates it. But why do I need to return the item first? I read the MongoDB: the definitive guide and it says that i...
Verifying signed git commits?
With newer versions of git it's possible to sign individual commits (in addition to tags) with a PGP key:
3 Answers
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How to make the 'cut' command treat same sequental delimiters as one?
I'm trying to extract a certain (the fourth) field from the column-based, 'space'-adjusted text stream. I'm trying to use the cut command in the following manner:
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How can you represent inheritance in a database?
I'm thinking about how to represent a complex structure in a SQL Server database.
8 Answers
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PostgreSQL - fetch the row which has the Max value for a column
I'm dealing with a Postgres table (called "lives") that contains records with columns for time_stamp, usr_id, transaction_id, and lives_remaining. I need a query that will give me the most recent lives_remaining total for each usr_id
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Android encryption / decryption using AES [closed]
...se as it is insecure (using SHA1PRNG for key derivation and using AES in ECB mode)
Instead (as of 2016), use PBKDF2WithHmacSHA1 for key derivation and AES in CBC or GCM mode (GCM provides both privacy and integrity)
You could use functions like these:
private static byte[] encrypt(byte[] raw, byte[]...
Alternatives to gprof [closed]
... a procedure is live on the stack, although I'm sorry to say it appears to become confused in the presence of mutual recursion. But the visualizer is very nice and light years ahead of gprof.
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How does Duff's device work?
...kipedia on the Duff's device , and I don't get it. I am really interested, but I've read the explanation there a couple of times and I still don't get it how the Duff's device works.
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Sprintf equivalent in Java
Printf got added to Java with the 1.5 release but I can't seem to find how to send the output to a string rather than a file (which is what sprintf does in C). Does anyone know how to do this?
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How to find if a native DLL file is compiled as x64 or x86?
I want to determine if a native assembly is complied as x64 or x86 from a managed code application ( C# ).
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