大约有 3,000 项符合查询结果（耗时：0.0315秒） [XML]
What is base 64 encoding used for?
...a textual encoding of binary data where the resultant text has nothing but letters, numbers and the symbols "+", "/" and "=". It's a convenient way to store/transmit binary data over media that is specifically used for textual data.
But why Base-64? The two alternatives for converting binary data i...
How to get ID of the last updated row in MySQL?
...sers set status = 'processing' where status = 'pending'
and last_insert_id(user_id)
limit 1
The addition of last_insert_id(user_id) in the where clause is telling MySQL to set its internal variable to the ID of the found row. When you pass a value to last_insert_id(expr) like this, it ends up ret...
How to change a string into uppercase
...
On the other hand string.ascii_uppercase is a string containing all ASCII letters in upper case:
import string
string.ascii_uppercase
#=> 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
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improve this answ...
Create unique constraint with null columns
... two partial indexes:
CREATE UNIQUE INDEX favo_3col_uni_idx ON favorites (user_id, menu_id, recipe_id)
WHERE menu_id IS NOT NULL;
CREATE UNIQUE INDEX favo_2col_uni_idx ON favorites (user_id, recipe_id)
WHERE menu_id IS NULL;
This way, there can only be one combination of (user_id, recipe_id) whe...
Fastest way to check if a string is JSON in PHP?
... OK
return $result;
}
Testing with Valid JSON INPUT
$json = '[{"user_id":13,"username":"stack"},{"user_id":14,"username":"over"}]';
$output = json_validate($json);
print_r($output);
Valid OUTPUT
Array
(
[0] => stdClass Object
(
[user_id] => 13
...
How to use a variable to specify column name in ggplot
...we can do :
library(tidyverse)
rates.by.groups <- data.frame(
name = LETTERS[1:3],
rate = 1:3,
mjr = LETTERS[c(4,4,5)],
gender = c("M","F","F")
)
f <- function(column) {
column <- sym(column)
ggplot(rates.by.groups,
aes(x = name,
y = rate,
...
In SQL, how can you “group by” in ranges?
... as [score range], count(*) as [number of occurrences]
from (
select user_id,
case when score >= 0 and score< 10 then '0-9'
when score >= 10 and score< 20 then '10-19'
else '20-99' end as range
from scores) t
group by t.range
...
Are there any naming convention guidelines for REST APIs? [closed]
...tching. It's doubtful, however, that the result of your request is only a user_id. It's much more likely that the result of the request is a User. Therefore, user is the noun you're fetching
www.example.com/greeting/user/x/
Makes sense to me. Focus on making your REST request a kind of noun p...
Set TextView text from html-formatted string resource in XML
...something like this for example: <![CDATA[...HTML...]]> that have 22 letters and html part have 10. so if you use HTML.fromhtml(getstring(...)) your text will be show correctly but text's content need 22 letters spaces. I used in listview and seen weedy spaces. so gettext() is BETTER.
...
Relational table naming convention [closed]
...ll the time, and you want keys to stand out from data columns. Always use user_id, never id.
Note that this is not a table name used as a prefix, but a proper descriptive name for the component of the key: user_id is the column that identifies an user, not the id of the user table.
(Except of...