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使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...tents
rver.
Keep in mind that the extensions mechanism is still unstable and under development. Any aia files you build in steps (1) a
Using App Inventor extensions to implement multitouch: Rotation detector
A demo app with rotation detector extension component
How to build rotation detector...
How can I return pivot table output in MySQL?
...an just do SUM(action='PRINT' AND pagecount=1) since the condition will be converted to 1 when true and 0 when false
– kajacx
Mar 2 at 8:04
1
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How can I generate a unique ID in Python? [duplicate]
I need to generate a unique ID based on a random value.
8 Answers
8
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Case insensitive string compare in LINQ-to-SQL
...es. If you upcase both the data and the query in your search, then you're converting all the text you're searching over for every query, which isn't performant.
– Andrew Arnott
May 15 '09 at 5:17
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Difference between clustered and nonclustered index [duplicate]
I need to add proper index to my tables and need some help.
6 Answers
6
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Why there is no ForEach extension method on IEnumerable?
...ch(Item item in list)
{
item.DoSomething();
}
The latter is clearer and easier to read in most situation, although maybe a bit longer to type.
However, I must admit I changed my stance on that issue; a ForEach() extension method would indeed be useful in some situations.
Here are the major...
Is there a difference between “throw” and “throw ex”?
... ex resets the stack trace (so your errors would appear to originate from HandleException)
throw doesn't - the original offender would be preserved.
static void Main(string[] args)
{
try
{
Method2();
}
catch (Exception ex)
{
Console.Write(ex.StackTrace.ToString()...
What is “String args[]”? parameter in main method Java
...
In Java args contains the supplied command-line arguments as an array of String objects.
In other words, if you run your program as java MyProgram one two then args will contain ["one", "two"].
If you wanted to output the contents of args, you can just loop thro...
PostgreSQL function for last inserted ID
...an id column created with the SERIAL pseudo-type. To avoid relying on this and to feel more clean, you can use instead pg_get_serial_sequence:
INSERT INTO persons (lastname,firstname) VALUES ('Smith', 'John');
SELECT currval(pg_get_serial_sequence('persons','id'));
Caveat: currval() only work...
Sync data between Android App and webserver [closed]
I want to sync data (such as db record, media) between an Android App and a Server. If you've seen Evernote or similar Applications, you certainly understand what I mean.
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