大约有 24,000 项符合查询结果（耗时：0.0301秒） [XML]
SQL Server : Columns to Rows
...answer or write in comments
cons
it's not as fast as dynamic SQL, rough tests gave me that xml is about 2.5 times slower that dynamic (it was one query on ~250000 rows table, so this estimate is no way exact). You could compare it yourself if you want, here's sqlfiddle example, on 100000 rows it ...
Best practices for in-app database migration for Sqlite
...tring stringWithFormat:@"PRAGMA user_version = %d", DatabaseSchemaVersionLatest] UTF8String], NULL, NULL, NULL);
}
Here's [self database] method that lazily opens the database:
- (FMDatabase *)database {
if (!_databaseOpen) {
_databaseOpen = YES;
NSString *documentsDir = [NSS...
generate days from date range
...-01-24
2010-01-23
2010-01-22
2010-01-21
2010-01-20
Notes on Performance
Testing it out here, the performance is surprisingly good: the above query takes 0.0009 sec.
If we extend the subquery to generate approx. 100,000 numbers (and thus about 274 years worth of dates), it runs in 0.0458 sec.
In...
How can I position my div at the bottom of its container?
...and without using tables (which screw with markup and such).
DEMO
This is tested to work on IE>7, chrome, FF & is a really easy thing to add to your existing layout.
<div id="container">
Some content you don't want affected by the "bottom floating" div
<div>supports no...
Initialization of an ArrayList in one line
I wanted to create a list of options for testing purposes. At first, I did this:
31 Answers
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Has Facebook sharer.php changed to no longer accept detailed parameters?
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If you encode the & in your URL to %26 it works correctly. Just tested and verified.
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Unescape HTML entities in Javascript?
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See my note to @kender about the poor testing he did ;)
– Roatin Marth
Dec 16 '09 at 21:08
24
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Asynchronously wait for Task to complete with timeout
...ys cancellation can be experienced in your code, and you should be sure to test for and be confident you properly handle all of them. Don't leave to chance various combinations and hope your computer does the right thing at runtime.
int timeout = 1000;
var task = SomeOperationAsync(cancellationToke...
Reading Xml with XmlReader in C#
...le XML document -->
<Items>
<Item>test with a child element <more/> stuff</Item>
</Items>";
// Create an XmlReader
using (XmlReader reader = XmlReader.Create(new StringReader(xmlString)))
{
XmlWriterSettings w...
How to solve “Plugin execution not covered by lifecycle configuration” for Spring Data Maven Builds
... <goals>
<goal>test-compile</goal>
<goal>compile</goal>
</goals>
</pluginExecutionFilter>
...