大约有 16,000 项符合查询结果（耗时：0.0490秒） [XML]
How can you represent inheritance in a database?
... to the base table. Example:
CREATE TABLE policies (
policy_id int,
date_issued datetime,
-- // other common attributes ...
);
CREATE TABLE policy_motor (
policy_id int,
vehicle_reg_no varchar(20),
-- // other attributes specific to motor insurance ....
Turning multi-line string into single comma-separated
... to the hold space and after deleting the introduced newline at the start, convert all newlines to ,'s.
N.B. Could be written:
sed 's/\S\+\s\+//;s/\s.*//;1h;1!H;$!d;x;s/\n/,/g' file
share
|
impro...
Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths - why?
....
[ForeignKey("StageId")]
public virtual Stage Stage { get; set; }
public int? StageId { get; set; }
share
|
improve this answer
|
follow
|
...
Scala list concatenation, ::: vs ++
...ts, there's no difference, but in the case of 3 or more, you have a good point, and I confirmed it with a quick benchmark. However, if you're worried about efficiency, x ::: y ::: z should be replaced with List(x, y, z).flatten. pastebin.com/gkx7Hpad
– Luigi Plinge
...
Random number from a range in a Bash Script
...
In this example, jot has unfair distribution for the interval's minimum and maximum (i.e., 2000 and 65000). In other words, the min and max will be generated less frequently. See my jot answer for details and a workaround.
– Clint Pachl
No...
Resize image in PHP
...hope is will work for you.
/**
* Image re-size
* @param int $width
* @param int $height
*/
function ImageResize($width, $height, $img_name)
{
/* Get original file size */
list($w, $h) = getimagesize($_FILES['logo_im...
Finding Number of Cores in Java
...
int cores = Runtime.getRuntime().availableProcessors();
If cores is less than one, either your processor is about to die, or your JVM has a serious bug in it, or the universe is about to blow up.
...
'typeid' versus 'typeof' in C++
...eof. typeof works on types too while decltype doesn't. For example, typeof(int) is int while decltype(int) is an error.
– Shahbaz
Aug 10 '17 at 19:23
1
...
Sending images using Http Post
... = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
for(int index=0; index < nameValuePairs.size(); index++) {
if(nameValuePairs.get(index).getName().equalsIgnoreCase("image")) {
// If the key equals to "image", we use FileBody to transfer the data
...
What's the difference between “groups” and “captures” in .NET regular expressions?
...say about it (pages 437+):
Depending on your view, it either adds
an interesting new dimension to the
match results, or adds confusion and
bloat.
And further on:
The main difference between a Group
object and a Capture object is that
each Group object contains a
collection of C...