大约有 15,000 项符合查询结果（耗时：0.0291秒） [XML]
What scalability problems have you encountered using a NoSQL data store? [closed]
...ap them to our Java object model, that's with everything correctly indexed etc.
Storing them as key/value pairs using a lightweight text representation: 1 table, 18,000 rows, 3 seconds to retrieve them all and reconstruct the Java objects.
In business terms: first option was not feasible. Second o...
What is the best way to insert source code examples into a Microsoft Word document?
..., fixed size tabs, single line spacing, no before/after paragraph spacing, etc. You only need to define this style once and then reuse it. You paste in your source code and apply the "Code" style to it.
Note that some editors (e.g. Xcode on the Mac) add RTF as well as text to the clipboard when cop...
What is the difference between RDF and OWL? [closed]
... some classes which represent the concept of subjects, objects, predicates etc. This means you can start making statements about classes of thing, and types of relationship. At the most simple level you can state things like http://familyontology.net/1.0#hasFather is a relationship between a person ...
Developing cross platform mobile application [closed]
...ailable:
Android, iOS, Moblin, Windows mobile 7, RIM, symbian, bada, maemo etc.
5 Answers
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How to create CSV Excel file C#? [closed]
...useful fixes myself. Everyone could add suggestions, fork it to contribute etc. etc. etc. Send me your forks so I merge them back into the repo.
PS. I posted all copyright notices for Chris. @Chris if you're against this idea - let me know, I'll kill it.
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Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
I have a data frame df and I use several columns from it to groupby :
7 Answers
7
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Is there any good dynamic SQL builder library in Java? [closed]
... a simpler API and supports also other backends (JPA, JDO, Lucene, Mongodb etc.); I am also in the company behind Querydsl
– Timo Westkämper
Apr 12 '11 at 5:55
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Getting root permissions on a file inside of vi? [closed]
...eed to add your user to sudoer file first, enter the root user, and open /etc/sudoers file, add your_username ALL=(ALL) ALL under the line root ALL=(ALL) ALL, quit and save.
– coolesting
Oct 25 '11 at 3:18
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Can someone explain this 'double negative' trick? [duplicate]
...single operand can be converted to true; otherwise, returns true.
So if getContext gives you a "falsey" value, the !! will make it return the boolean value false. Otherwise it will return true.
The "falsey" values are:
false
NaN
undefined
null
"" (empty string)
0
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How to secure MongoDB with username and password
...at starts with #auth=true in your mongod configuration file (default path /etc/mongo.conf). This will enable authentication for mongodb.
Then, restart mongodb : sudo service mongod restart
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