大约有 8,600 项符合查询结果（耗时：0.0477秒） [XML]
How can I rename a database column in a Ruby on Rails migration?
...
http://api.rubyonrails.org/classes/ActiveRecord/Migration.html
Under Available Transformations
rename_column(table_name, column_name, new_column_name):
Renames a column but keeps the type and content.
...
What does Bump Version stand for?
...
Semver is mostly for libs and APIs. It doesn't make sense everywhere.
– Marc.2377
Nov 20 '19 at 1:03
add a comment
...
Get last element of Stream/List in a one-liner
...of course) or not. The statement of Brian Goetz makes a point, further the API documentation states that reduce("", String::concat) is an inefficient but correct solution for string concatenation, which implies maintenance of the encounter order.The intention is well-known,the documentation has to c...
Setting a timeout for socket operations
... timeout on read() operations.
See: http://docs.oracle.com/javase/7/docs/api/java/net/Socket.html
share
|
improve this answer
|
follow
|
...
Is effective C++ still effective?
...probably have an entire chapter on making effective use of the concurrency API. Such a book would also contain different examples, e.g., ones making use of auto variables, range-based for loops, in-class default initializers, as well as the occasional variadic template. To the extent that this book ...
data.table vs dplyr: can one do something well the other can't or does poorly?
...
is easily generalised to other contexts: interactive web
graphics, web
scraping,
gists, run-time
contracts, ...)
Memory and performance
I've lumped these together, because, to me, they're not that important.
Most R users work with well under 1 million rows of data, and dplyr is
sufficiently fast ...
Default string initialization: NULL or Empty? [closed]
... return values from Python scripts, examine values retrieved from external APIs, etc.)
share
|
improve this answer
|
follow
|
...
Assign variable in if condition statement, good practice or not? [closed]
...st') Creates a node.js GLOBAL variable myvar (nodejs.org/docs/latest-v12.x/api/globals.html#globals_global). So if you're like me and used that variable in server request handling (coming back to it after a few seconds when other requests might have dropped in and stuff), you can be surprised at wha...
Getting the first and last day of a month, using a given DateTime object
...
Getting month range with .Net API (just another way):
DateTime date = ...
var firstDayOfMonth = new DateTime(date.Year, date.Month, 1);
var lastDayOfMonth = new DateTime(date.Year, date.Month, DateTime.DaysInMonth(date.Year, date.Month));
...
What is the purpose of using -pedantic in GCC/G++ compiler?
...so implement the ANSI standard, and, if you are careful in which libraries/api calls you use, under other operating systems/platforms.
The first one, turns off SPECIFIC features of GCC. (-ansi)
The second one, will complain about ANYTHING at all that does not adhere to the standard (not only specif...