大约有 45,000 项符合查询结果（耗时：0.0547秒） [XML]
Java - JPA - @Version annotation
...//...
}
On update, the field annotated with @Version will be incremented and added to the WHERE clause, something like this:
UPDATE MYENTITY SET ..., VERSION = VERSION + 1 WHERE ((ID = ?) AND (VERSION = ?))
If the WHERE clause fails to match a record (because the same entity has already been up...
LINQ to Entities only supports casting EDM primitive or enumeration types with IEntity interface
... Perfect, it's great being able to perform Interface-based queries and still maintain the collection as IQueryable. A bit annoying however that there is basically no way of thinking up this fix, without knowing the inner workings of EF.
– Anders
Dec 9 '...
Can't use NVM from root (or sudo)
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The below list of commands (source: digitalocean) seems to fix the problem
n=$(which node); \
n=${n%/bin/node}; \
chmod -R 755 $n/bin/*; \
sudo cp -r $n/{bin,lib,share} /usr/local
The above command is a bit complicated, but all it's doing is co...
Converting an integer to a hexadecimal string in Ruby
...ase other than 10:
10.to_s(16) #=> "a"
Note that in ruby 2.4 FixNum and BigNum were unified in the Integer class.
If you are using an older ruby check the documentation of FixNum#to_s and BigNum#to_s
share
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ALTER DATABASE failed because a lock could not be placed on database
...base because some processes are not working. My plan is to take it offline and back online again.
10 Answers
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jQuery duplicate DIV into another DIV
Need some jquery help copying a DIV into another DIV and hoping that this is possible. I have the following HTML:
5 Answers...
Max return value if empty query
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I know this is an old question and the accepted answer works, but this question answered my question about whether such an empty set would result in an exception or a default(int) result.
The accepted answer however, while it does work, isn't the ideal so...
How to replace a whole line with sed?
...lish this:
sed -i "/aaa=/c\aaa=xxx" your_file_here
This will go through and find any lines that pass the aaa= test, which means that the line contains the letters aaa=. Then it replaces the entire line with aaa=xxx. You can add a ^ at the beginning of the test to make sure you only get the line...
Regular expression for a string containing one word but not another
I'm setting up some goals in Google Analytics and could use a little regex help.
4 Answers
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Getting the SQL from a Django QuerySet [duplicate]
...use "Django never actually interpolates the parameters: it sends the query and the parameters separately to the database adapter, which performs the appropriate operations." Source: code.djangoproject.com/ticket/17741
– gregoltsov
Jul 7 '14 at 14:50
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