大约有 30,000 项符合查询结果（耗时：0.0959秒） [XML]
Row Offset in SQL Server
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I would avoid using SELECT *. Specify columns you actually want even though it may be all of them.
SQL Server 2005+
SELECT col1, col2
FROM (
SELECT col1, col2, ROW_NUMBER() OVER (ORDER BY ID) AS RowNum
FROM MyTable
) AS MyDer...
Case-insensitive search in Rails model
...ed behavior. Suppose we have after_create callback in Product model and inside the callback, we have where clause, e.g. products = Product.where(country: 'us'). In this case, the where clauses are chained as callbacks execute within the context of the scope. Just FYI.
– elquimi...
How can I add to List
...rom the list.
So now, thanks to generics wildcards, I can do any of these calls with that single method:
// copy(dest, src)
Collections.copy(new ArrayList<Number>(), new ArrayList<Number());
Collections.copy(new ArrayList<Number>(), new ArrayList<Integer());
Collections.copy(new ...
delete vs delete[] operators in C++
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The delete operator deallocates memory and calls the destructor for a single object created with new.
The delete [] operator deallocates memory and calls destructors for an array of objects created with new [].
Using delete on a pointer returned by new [] or delete ...
Functions that return a function
...ce to the function. Putting the parenthesis at the end of a function name, calls the function, returning the functions return value.
Demo
function a() {
alert('A');
}
//alerts 'A', returns undefined
function b() {
alert('B');
return a;
}
//alerts 'B', returns function a
function c() ...
Is asynchronous jdbc call possible?
I wonder if there is a way to make asynchronous calls to a database?
16 Answers
16
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Garbage collector in Android
I have seen many Android answers that suggest calling the garbage collector in some situations.
11 Answers
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Most efficient way of making an if-elif-elif-else statement when the else is done the most?
...actually slower than the if ... elif ... else construct, because it has to call a function, which can be a significant performance overhead in a tight loop.
Consider these examples...
1.py
something = 'something'
for i in xrange(1000000):
if something == 'this':
the_thing = 1
eli...
Calling generic method with a type argument known only at execution time [duplicate]
...ot notation - there's no point in using a query expression when you've basically just got a where clause.
using System;
using System.Linq;
using System.Reflection;
namespace Interfaces
{
interface IFoo {}
interface IBar {}
interface IBaz {}
}
public class Test
{
public static void...
Calling outer class function from inner class [duplicate]
I have implemented a nested class in Java, and I need to call the outer class method from the inner class.
2 Answers
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