大约有 3,577 项符合查询结果（耗时：0.0395秒） [XML]
How to define a custom ORDER BY order in mySQL
...
MySQL has a handy function called FIELD() which is excellent for tasks like this.
ORDER BY FIELD(Language,'ENU','JPN','DAN'), ID
Note however, that
It makes your SQL less portable, as other DBMSs might not have such function
When your list of languages (or other values to...
Python: Bind an Unbound Method?
...:
bound_handler = handler.__get__(self, MyWidget)
Here's R. Hettinger's excellent guide to descriptors.
As a self-contained example pulled from Keith's comment:
def bind(instance, func, as_name=None):
"""
Bind the function *func* to *instance*, with either provided name *as_name*
...
SQL select only rows with max value on a column [duplicate]
...e performance, but here's a trick inspired by the limitations of Microsoft Excel. It has some good features
GOOD STUFF
It should force return of only one "max record" even if there is a tie (sometimes useful)
It doesn't require a join
APPROACH
It is a little bit ugly and requires that you kno...
Replace specific characters within strings
...from strings within a vector, similar to the Find and Replace feature in Excel.
6 Answers
...
Hibernate Annotations - Which is better, field or property access?
...
@ElnurAbdurrakhimov there we go, an excellent example. Thanks.
– Martin
Dec 4 '14 at 10:22
|
show 2 m...
OpenLayers vs Google Maps? [closed]
...tions.
OpenLayers and Google Maps have different targets.
OpenLayer is an excellent framework to display geodata, but Google Maps is a pool of services that include a framework to display geodata among other services.
So, Google Maps expose a lot services and features that OpenLayes do not have.
S...
Partly JSON unmarshal into a map in Go
...g"`
}
func main() {
/** Clean way to solve Json Decoding in Go */
/** Excellent solution */
var chat Chat
r := bytes.NewReader([]byte(messeging))
chatErr := json.NewDecoder(r).Decode(&chat)
errHandler(chatErr)
fmt.Println(chat.Say)
fmt.Println(chat.SendMsg.User)
fmt.Pr...
Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
...
The tidyr package from the tidyverse has an excellent function that does this.
Assuming your variables are named v1, v2 and v3, left to right, and you data frame is named dat:
dat %>%
spread(key = v2,
value = v3)
Ta da!
...
Is modern C++ becoming more prevalent? [closed]
... always maintaining backwards compatibility with DOS. (See Raymond Chen's excellent blog for the often painful lengths they went to...)
– j_random_hacker
Feb 13 '09 at 3:27
2
...
ng-options with simple array init
...ng-selected does not need the handlebars since it is an angular directive. Excellent solution.
– Kasey Speakman
Dec 9 '14 at 21:03
...