大约有 800 项符合查询结果（耗时：0.0165秒） [XML]
Collections.emptyList() vs. new instance
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Starting with Java 5.0 you can specify the type of element in the container:
Collections.<Foo>emptyList()
I concur with the other responses that for cases where you want to return an empty list that stays empty, you should use this app...
How to split the name string in mysql?
... Check the manual for some real confusion. http://dev.mysql.com/doc/refman/5.0/en/string-functions.html
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Unknown Column In Where Clause
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See the following MySQL manual page: http://dev.mysql.com/doc/refman/5.0/en/select.html
"A select_expr can be given an alias
using AS alias_name. The alias is used
as the expression's column name and
can be used in GROUP BY, ORDER BY, or
HAVING clauses."
(...)
It is not permi...
How to access a mobile's camera from a web app?
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I did, on Android 5.0 apparently Phonegap doesnt have HTML capture built in. So it can't capture things, no camrecord, no audio, no Camera. I had to build a work around.
– Benyaman
Apr 22 '17 at 16:46
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How can I trim leading and trailing white space?
...# 4 "4.6" "3.1" "1.5" "0.2" "setosa"
# 5 "5.0" "3.6" "1.4" "0.2" "setosa"
# 6 "5.4" "3.9" "1.7" "0.4" "setosa"
See also ?print.data.frame for other options.
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Using CSS in Laravel views?
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This is different now for Laravel 5.0 where the illuminate/html package is no longer included by default laracasts.com/series/laravel-5-fundamentals/episodes/10 for details
– dangel
May 20 '15 at 2:23
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MySQL “NOT IN” query
...s for <> ANY, but for <> ALL!
http://dev.mysql.com/doc/refman/5.0/en/any-in-some-subqueries.html
SELECT c FROM t1 LEFT JOIN t2 USING (c) WHERE t2.c IS NULL
cant' be replaced by
SELECT c FROM t1 WHERE c NOT IN (SELECT c FROM t2)
You must use
SELECT c FROM t1 WHERE c <> ANY ...
Tool to read and display Java .class versions
...(1.7); 50.0=JavaSE6(1.6); 52.0=JavaSE8(1.8); 53.0=JavaSE9; 54.0=JavaSE10; 55.0=JavaSE11; 56.0=JavaSE12; 57.0=JavaSE13; 58.0=JavaSE14;
– nephewtom
Jul 24 '19 at 14:50
add a com...
How do I make a column unique and index it in a Ruby on Rails migration?
...:email_address)
class AddIndexToEmailAddress < ActiveRecord::Migration[5.0]
def change
change_table :people do |t|
t.index :email_address, unique: true
end
end
end
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Making an array of integers in iOS
...ted an array of Doubles, you would use :
var array = [1.0, 2.0, 3.0, 4.0, 5.0, 6.0] // implicit type-inference
or:
var array: [Double] = [1, 2, 3, 4, 5, 6] // explicit type
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