大约有 16,000 项符合查询结果（耗时：0.0214秒） [XML]
GROUP BY with MAX(DATE) [duplicate]
...
VERY slow! The currency converter table with fields date,from,to,rate. 203161 rows total. Joe Meyer method gives 362 rows in set (31,29 sec). Oliver Hanappi method gives 362 rows in set (0,04 sec)
– TheRoSS
Dec...
A complete solution to LOCALLY validate an in-app receipts and bundle receipts on iOS 7
...nReceipt:receipt success:successBlock failure:nil]; // failureBlock is nil intentionally. See below.
if (verified) return;
// Apple recommends to refresh the receipt if validation fails on iOS
[[RMStore defaultStore] refreshReceiptOnSuccess:^{
RMAppReceipt *receipt = [RMAppReceipt bundleReceipt...
Java 理论与实践: 线程池与工作队列 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...线程池的工作队列
public class WorkQueue
{
private final int nThreads;
private final PoolWorker[] threads;
private final LinkedList queue;
public WorkQueue(int nThreads)
{
this.nThreads = nThreads;
queue = new LinkedList();
threads = new...
What's default HTML/CSS link color?
... a screenshot, and visiting a website like html-color-codes.info that will convert a screenshot to a color code.
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How can I initialize a String array with length 0 in Java?
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@Thomas: I take your point, but for this particular case I prefer the more explicit form. It's clearer to me that it means "I want a string array with 0 elements" rather than "I want an array with this content - which is empty". Just personal prefe...
How to implement a confirmation (yes/no) DialogPreference?
...awable.ic_dialog_alert)
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
Toast.makeText(MainActivity.this, "Yaay", Toast.LENGTH_SHORT).show();
}})
.setNegativeButton(android.R.string.no, ...
Check list of words in another string [duplicate]
...bstantial length, and you need to do this test many times, it may be worth converting the list to a set and using set intersection to test (with the added benefit that you wil get the actual words that are in both lists):
>>> long_word_list = 'some one long two phrase three about above alo...
How to put a new line into a wpf TextBlock control?
...de the string had double backslashes.
\\r\\n
To fix this I wrote a ValueConverter to strip the extra backslash.
public class XmlStringConverter : IValueConverter
{
public object Convert(
object value,
Type targetType,
object parameter,
CultureInfo culture)
...
What is the difference between substr and substring?
... //*** negative second argument:
"string".substring(2,-4); // "st" (converts negative numbers to 0, then swaps first and second position)
"string".substr(2,-4); // ""
"string".slice(2,-4); // ""
//*** negative first argument:
"string".substring(-3); // "string" ...
Force update of an Android app when a new version is available
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I agree with Scott Helme's point in another answer here. But in some extreme situations (security issues, API breaking changes...) where you absolutely need the users to update to continue using the app, you could provide a simple versioning API. The API...