大约有 30,000 项符合查询结果（耗时：0.0597秒） [XML]
Why do people hate SQL cursors so much? [closed]
..."set-based operators" bundles the cursor results into a single result set, meaning less API back-and-forth.
Cursors predate modern languages that provide first-class collections. Old C, COBOL, Fortran, etc., had to process rows one at a time because there was no notion of "collection" that could b...
Create a pointer to two-dimensional array
...hout copying all of them. That's just a behavior of array types and is not meant to imply that they are same thing.
Multidimensional arrays
Multidimensional arrays are just a way to 'partition' memory in a way that the compiler/machine can understand and operate on.
For instance, int a[4][3][...
What is the difference between char s[] and char *s?
...of this anonymous array via this pointer; the effects are undefined (often meaning a crash):
x[1] = 'O'; // BAD. DON'T DO THIS.
Using the array syntax directly allocates it into new memory. Thus modification is safe:
char x[] = "Foo";
x[1] = 'O'; // No problem.
However the array only lives as ...
How to horizontally center a
...
You can apply this CSS to the inner <div>:
#inner {
width: 50%;
margin: 0 auto;
}
Of course, you don't have to set the width to 50%. Any width less than the containing <div> will work. The margin: 0 auto is what does the actual centering.
If you are targeting Internet...
JPA EntityManager: Why use persist() over merge()?
...t to the entity manager.
merge:
Find an attached object with the same id and update it.
If exists update and return the already attached object.
If doesn't exist insert the new register to the database.
persist() efficiency:
It could be more efficient for inserting a new register to a data...
How do I measure request and response times at once using cURL?
...TML transferred: 1268293 bytes
Requests per second: 9.35 [#/sec] (mean)
Time per request: 107.004 [ms] (mean)
Time per request: 107.004 [ms] (mean, across all concurrent requests)
Transfer rate: 121.48 [Kbytes/sec] received
Connection Times (ms)
min mean...
Is VB really case insensitive?
...
I don't think Jared meant it's only the IDE. I think he has said the compiler is case-insensitive, so it thinks ss is identical to SS, but also as an aid to reading the IDE corrects SS to ss as you type. So even if the IDE didn't correct the cas...
How can I use optional parameters in a T-SQL stored procedure?
...cedure that will handle this? Let's say I have a table with four fields: ID, FirstName, LastName and Title. I could do something like this:
...
What is a Portable Class Library?
...450 people, with average 20 minute (let's assume) to go through the links, means 561 days wasted in total.
– Zafar
Dec 21 '17 at 5:46
...
Are Mutexes needed in javascript?
...e read that there are no threads in javascript, but what exactly does that mean?
7 Answers
...