大约有 21,000 项符合查询结果（耗时：0.0483秒） [XML]
Odd behavior when Java converts int to byte?
...t (32 bits) you simply copy the 1 to the left 24 times.
Now, one way to read a negative two's complement number is to start with the least significant bit, move left until you find the first 1, then invert every bit afterwards. The resulting number is the positive version of that number
For exampl...
Best approach to remove time part of datetime in SQL Server
...
Strictly, method a is the least resource intensive:
a) select DATEADD(dd, DATEDIFF(dd, 0, getdate()), 0)
Proven less CPU intensive for same total duration a million rows by some one with way too much time on their hands: Most efficient way in SQL Server to get date from date+time?
I saw ...
How do I create multiple submit buttons for the same form in Rails?
...
AnuragAnurag
129k3333 gold badges210210 silver badges253253 bronze badges
...
Merge PDF files
...ns.
#!/usr/bin/env python
import sys
try:
from PyPDF2 import PdfFileReader, PdfFileWriter
except ImportError:
from pyPdf import PdfFileReader, PdfFileWriter
def pdf_cat(input_files, output_stream):
input_streams = []
try:
# First open all the files, then produce the output ...
Does Firefox support position: relative on table elements?
...and most proper way would be to wrap the contents of the cell in a div and add position:relative to that div.
example:
<td>
<div style="position:relative">
This will be positioned normally
<div style="position:absolute; top:5px; left:5px;">
This will be p...
Creating an iframe with given HTML dynamically
...
GillesCGillesC
9,53333 gold badges3535 silver badges5353 bronze badges
3
...
How to concatenate strings of a string field in a PostgreSQL 'group by' query?
..._agg(employee, ', ')
FROM mytable
GROUP BY company_id;
Postgres 9.0 also added the ability to specify an ORDER BY clause in any aggregate expression; otherwise, the order is undefined. So you can now write:
SELECT company_id, string_agg(employee, ', ' ORDER BY employee)
FROM mytable
GROUP BY comp...
Does JavaScript have a built in stringbuilder class?
...
Fabian JakobsFabian Jakobs
26.5k77 gold badges3737 silver badges3636 bronze badges
7
...
Backbone.js get and set nested object attribute
...ever nest POJSOs ("plain old JavaScript objects") in your models, and instead nest custom model classes. So it would look something like this:
var Obj = Backbone.Model.extend({
defaults: {
myAttribute1: false,
myAttribute2: true
}
});
var MyModel = Backbone.Model.extend({
...
CSS: How to position two elements on top of each other, without specifying a height?
...s or you will come across odd and confusing behavior; you probably want to add top: 0; left: 0 to the CSS for both of your absolutely positioned elements. You'll also want to have position: relative on .container_row if you want the absolutely positioned elements to be positioned with respect to the...