大约有 16,000 项符合查询结果（耗时：0.0305秒） [XML]
Throw an error in a MySQL trigger
... the approach:
delimiter //
use test//
create table trigger_test
(
id int not null
)//
drop trigger if exists trg_trigger_test_ins //
create trigger trg_trigger_test_ins before insert on trigger_test
for each row
begin
declare msg varchar(128);
if new.id < 0 then
set msg = co...
Python function attributes - uses and abuses [closed]
... of C# (indicating that a certain method should be part of the web service interface)
class Foo(WebService):
@webmethod
def bar(self, arg1, arg2):
...
then I can define
def webmethod(func):
func.is_webmethod = True
return func
Then, when a webservice call arrives, I lo...
GUI-based or Web-based JSON editor that works like property explorer [closed]
...put a UI in front of the Perl data structure generation, e.g. a web form.
Converting a structure to JSON is very straightforward:
use strict;
use warnings;
use JSON::Any;
my $data = { arbitrary structure in here };
my $json_handler = JSON::Any->new(utf8=>1);
my $json_string = $json_handler-...
What is the meaning of the term “free function” in C++?
... // not a free function
};
void g() {} // free function
int h(int, int) { return 1; } // also a free function
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Selenium c# Webdriver: Wait Until Element is Present
... I used the approach provided and found the method was deprecated as pointed out by Samuel. Checking for the existence of an item now waits up to the specified time.
– Jim Scott
Jun 1 '17 at 0:47
...
How to stop a goroutine
...func main() {
var wg sync.WaitGroup
wg.Add(1)
ch := make(chan int)
go func() {
for {
foo, ok := <- ch
if !ok {
println("done")
wg.Done()
return
}
println(foo)
}
}()...
Android screen size HDPI, LDPI, MDPI [duplicate]
...
Check out this awesome converter. http://labs.rampinteractive.co.uk/android_dp_px_calculator/
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Select row with most recent date per user
... the min would be t1.time > t2.time which is the opposite of my initial intuition.
– None
May 12 '15 at 0:44
1
...
Bin size in Matplotlib (Histogram)
...))
Added to original answer
The above line works for data filled with integers only. As macrocosme points out, for floats you can use:
import numpy as np
plt.hist(data, bins=np.arange(min(data), max(data) + binwidth, binwidth))
...
Dictionary returning a default value if the key does not exist [duplicate]
..., the result of executing a delegate). There's nothing more powerful built into the framework. I would suggest two extension methods:
public static TValue GetValueOrDefault<TKey, TValue>
(this IDictionary<TKey, TValue> dictionary,
TKey key,
TValue defaultValue)
{
TVal...