大约有 32,000 项符合查询结果（耗时：0.0472秒） [XML]
In Django, how does one filter a QuerySet with dynamic field lookups?
... like a dictionary. We turn it back into a real dictionary with eval() and then stuff it into the queryset with **kwargs:
kwargs = eval(self.question.custom_query)
user_list = User.objects.filter(**kwargs).order_by("last_name")
...
How can I exclude some folders from my Eclipse project?
...ojects as peers. e.g:
~/myworkspace/goodproject
~/myworkspace/3rdparty
then import only "goodproject" into eclipse. If "3rdparty" is a subdirectory of goodproject, you can fake it out... Say for example your svn project looks like this:
project/
src/
main/
3rdparty/
...
How to check file MIME type with javascript before upload?
...ture against known types
};
fileReader.readAsArrayBuffer(blob);
You can then determine the real MIME type like so (more file signatures here and here):
switch (header) {
case "89504e47":
type = "image/png";
break;
case "47494638":
type = "image/gif";
break...
How to calculate the difference between two dates using PHP?
...swer below
You can use strtotime() to convert two dates to unix time and then calculate the number of seconds between them. From this it's rather easy to calculate different time periods.
$date1 = "2007-03-24";
$date2 = "2009-06-26";
$diff = abs(strtotime($date2) - strtotime($date1));
$years = ...
Haskell: How is pronounced? [closed]
...ve's! Something like [| f a b c d |] (as suggested by the original paper). Then we wouldn't need the <*> combinator and you would refer to such an expression as an example of "function application in a functorial context"
– Tom Crockett
Jan 6 '11 at 0:09
...
Detect network connection type on Android
...ned by {@link ConnectivityManager}.
* If there is no network connection then -1 is returned.
* @see NetworkInfo#getType()
*/
public static int getType(Context context) {
NetworkInfo info = getInfo(context);
if (info == null || !info.isConnected()) {
return TYPE_NONE;
}
...
JavaFX and OpenJDK
...PMs for the JDK and JRE that include JavaFX. Those software distributors, then need to place the generated packages in their standard distribution code repositories (e.g. fedora/red hat network yum repositories). Currently this is not being done, but I would be quite surprised if Java 8 Linux pack...
Mongodb Explain for Aggregation framework
...o that we don't have to pass the entire collection into our pipeline. But, then later on, following some additional processing, want to filter once again using a different set of criteria. So, to recap, pipeline works with a MongoDB collection. They're composed of stages, each of which does a differ...
How does Git handle symbolic links?
...ect that it links to) in a 'blob' just like it would for a normal file. It then stores the name, mode and type (including the fact that it is a symlink) in the tree object that represents its containing directory.
When you checkout a tree containing the link, it restores the object as a symlink reg...
What arguments are passed into AsyncTask?
... is Don't memorize.
If you can visualize what your task really needs to do then writing the AsyncTask with the correct signature would be a piece of cake.
Just figure out what your Input, Progress and Output are and you will be good to go.
For example:
Heart of the AsyncTask!
doInBackgound() method...