大约有 45,000 项符合查询结果（耗时：0.0574秒） [XML]
Does Foreign Key improve query performance?
Suppose I have 2 tables, Products and ProductCategories. Both tables have relationship on CategoryId. And this is the query.
...
Can I zip more than two lists together in Scala?
... case, I see that a list of lists would be better anyway, as I need to map and reduce the various sub-lists.
– pr1001
Nov 3 '09 at 1:38
2
...
Is it possible to get the non-enumerable inherited property names of an object?
...etOwnPropertyNames can get you non-enumerable properties, you can use that and combine it with walking up the prototype chain.
function getAllProperties(obj){
var allProps = []
, curr = obj
do{
var props = Object.getOwnPropertyNames(curr)
props.forEach(function(prop){
...
How to use Swift @autoclosure
...})
// "It's true"
If we omit the braces, we are passing in an expression and that's an error:
f(pred: 2 > 1)
// error: '>' produces 'Bool', not the expected contextual result type '() -> Bool'
@autoclosure creates an automatic closure around the expression. So when the caller writes an...
How do I see a C/C++ source file after preprocessing in Visual Studio?
...
cl.exe, the command line interface to Microsoft Visual C++, has three different options for outputting the preprocessed file (hence the inconsistency in the previous responses about Visual C++):
/E: preprocess to stdout (similar to GCC's -...
Bootstrap 3 Flush footer to bottom. not fixed
... will position your Footer to stick to bottom if the page has less content and behave like a normal footer if the page has more content.
CSS
* {
margin: 0;
}
html, body {
height: 100%;
}
.wrapper {
min-height: 100%;
height: 100%;
margin: 0 auto -155px; /* the bottom margin is t...
How to check in Javascript if one element is contained within another
...'s now a native way to achieve this. Node.contains(). Mentioned in comment and below answers as well.
Old answer:
Using the parentNode property should work. It's also pretty safe from a cross-browser standpoint. If the relationship is known to be one level deep, you could check it simply:
if (ele...
What are best practices for multi-language database design? [closed]
...guage database? To create localized table for every table is making design and querying complex, in other case to add column for each language is simple but not dynamic, please help me to understand what is the best choose for enterprise applications
...
Google Maps API v3: How do I dynamically change the marker icon?
... you asking about the actual way to do it? You could just create each div, and a add a mouseover and mouseout listener that would change the icon and back for the markers.
share
|
improve this answ...
How to find the duration of difference between two dates in java?
...
try the following
{
Date dt2 = new DateAndTime().getCurrentDateTime();
long diff = dt2.getTime() - dt1.getTime();
long diffSeconds = diff / 1000 % 60;
long diffMinutes = diff / (60 * 1000) % 60;
long diffHours = diff / (60 * 60 * 1...