大约有 32,000 项符合查询结果（耗时：0.0464秒） [XML]
Image comparison - fast algorithm
I'm looking to create a base table of images and then compare any new images against that to determine if the new image is an exact (or close) duplicate of the base.
...
Cannot insert explicit value for identity column in table 'table' when IDENTITY_INSERT is set to OFF
... +1 exactly - turn the option to allow explicit inserts ON, then insert, then turn the option OFF again
– marc_s
Aug 26 '09 at 11:37
13
...
Can we instantiate an abstract class?
... creating an instance of an anonymous subclass of your abstract class. And then you are invoking the method on your abstract class reference pointing to subclass object.
This behaviour is clearly listed in JLS - Section # 15.9.1: -
If the class instance creation expression ends in a class body,...
DBMS_OUTPUT.PUT_LINE not printing
...ed and doesn't print the infomation i want it to (firstName, lastName) and then the other values from the select query in a table below.
...
Why is it bad style to `rescue Exception => e` in Ruby?
...
@JonathanSwartz Then rescue from those specific subclasses, not Exception. More specific is nearly always better and clearer.
– Andrew Marshall
Sep 19 '13 at 19:15
...
What's the difference between [ and [[ in Bash? [duplicate]
...looked at bash man page and the [[ says it uses Conditional Expressions. Then I looked at Conditional Expressions section and it lists the same operators as test (and [ ).
...
How to declare a structure in a header that is to be used by multiple files in c?
...complication, but this is out of topic (no C++ tag), so I won't elaborate.
then how to declare that structure as extern in both the files. ?
I fail to see the point, perhaps, but Greg Hewgill has a very good answer in his post How to declare a structure in a header that is to be used by multiple fil...
Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
...e central idea of a mutex is that the locking thread unlocks the mutex and then other threads may do the same. From computing.llnl.gov/tutorials/pthreads:
– user657862
Oct 22 '13 at 17:31
...
Picking a random element from a set
...
If myHashSet is large, then this will be a rather slow solution since on average, (n / 2) iterations will be needed to find the random object.
– daniel
Sep 24 '08 at 2:30
...
MySQL: multiple tables or one table with many columns?
...
Any time information is one-to-one (each user has one name and password), then it's probably better to have it one table, since it reduces the number of joins the database will need to do to retrieve results. I think some databases have a limit on the number of columns per table, but I wouldn't wor...