大约有 47,000 项符合查询结果（耗时：0.0500秒） [XML]
How can i get the session object if i have the entity-manager
...
answered Nov 11 '10 at 6:14
Pascal ThiventPascal Thivent
524k126126 gold badges10121012 silver badges10991099 bronze badges
...
Why is Maven downloading the maven-metadata.xml every time?
... |
edited May 16 '17 at 10:27
Community♦
111 silver badge
answered Aug 5 '15 at 7:08
...
Best way to store date/time in mongodb
...)
> db.test.find()
{ "_id" : ObjectId("..."), "date" : ISODate("2014-02-10T10:50:42.389Z") }
{ "_id" : ObjectId("..."), "date" : ISODate("2014-02-10T10:50:57.240Z") }
The native type supports a whole range of useful methods out of the box, which you can use in your map-reduce jobs, for example....
C# switch on type [duplicate]
...3
Noctis
10.7k33 gold badges3535 silver badges7171 bronze badges
answered Dec 18 '10 at 14:51
Mark HMark H
...
How to find the statistical mode?
...}
On my dinky little machine, that can generate & find the mode of a 10M-integer vector in about half a second.
If your data set might have multiple modes, the above solution takes the same approach as which.max, and returns the first-appearing value of the set of modes. To return all modes,...
How to reset radiobuttons in jQuery so that none is checked
...
answered Jun 10 '09 at 17:51
lambaccklambacck
8,81633 gold badges3030 silver badges4444 bronze badges
...
Combining C++ and C - how does #ifdef __cplusplus work?
...
answered Sep 24 '10 at 17:32
Andrew ShelanskyAndrew Shelansky
4,20733 gold badges1717 silver badges1919 bronze badges
...
How to do ssh with a timeout in a script?
...
ssh -o ConnectTimeout=10 <hostName>
Where 10 is time in seconds. This Timeout applies only to the creation of the connection.
share
|
i...
Summarizing multiple columns with dplyr? [duplicate]
...library(purrrlyr)
library(data.table)
library(bench)
set.seed(123)
n <- 10000
df <- data.frame(
a = sample(1:5, n, replace = TRUE),
b = sample(1:5, n, replace = TRUE),
c = sample(1:5, n, replace = TRUE),
d = sample(1:5, n, replace = TRUE),
grp = sample(1:3, n, replace = TRUE)
)
d...
NSObject +load and +initialize - What do they do?
...
}
return 0;
}
This program prints two lines of output:
2012-11-10 16:18:38.984 testApp[7498:c07] in Superclass initialize; self = Superclass
2012-11-10 16:18:38.987 testApp[7498:c07] in Superclass initialize; self = Subclass
Since the system sends the initialize method lazily, a class ...