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Generating a UUID in Postgres for Insert statement?
...ware of the concept of a UUID and I want to generate one to refer to each 'item' from a 'store' in my DB with. Seems reasonable right?
...
How to implement a ConfigurationSection with a ConfigurationElementCollection
...= false)]
[ConfigurationCollection(typeof(ServiceCollection),
AddItemName = "add",
ClearItemsName = "clear",
RemoveItemName = "remove")]
public ServiceCollection Services
{
get
{
return (ServiceCollection)base["Services"];
}
}
}
And that ...
Django select only rows with duplicate field values
... .filter(id__count__gt=1)
Literal.objects.filter(name__in=[item['name'] for item in dupes])
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Why does my application spend 24% of its life doing a null check?
...ap compacting algorithm otherwise having an unpredictable affect on that. Best to not let me guess at this, measure so you know a fact.
– Hans Passant
May 15 '13 at 11:21
11
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Why does String.valueOf(null) throw a NullPointerException?
...the story
There are several important ones:
Effective Java 2nd Edition, Item 41: Use overloading judiciously
Just because you can overload, doesn't mean you should every time
They can cause confusion (especially if the methods do wildly different things)
Using good IDE, you can check which ove...
right click context menu for datagridview
...tons.Right)
{
ContextMenu m = new ContextMenu();
m.MenuItems.Add(new MenuItem("Cut"));
m.MenuItems.Add(new MenuItem("Copy"));
m.MenuItems.Add(new MenuItem("Paste"));
int currentMouseOverRow = dataGridView1.HitTest(e.X,e.Y).RowIndex;
if (currentMo...
MFC 中CImageList的用法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...制列表
然后在树控制的结构定义中进行如下设置：
TCItem.item.iImage=0; //设置未选中图像索引号
TCItem.item.iSelectedImage=1;//设置选中时图像引号
MSDN中
由于图像列表不是窗口，它们本身并不是控件；但它们和几种不同类型的控...
How to override the copy/deepcopy operations for a Python object?
...w__(cls)
memo[id(self)] = result
for k, v in self.__dict__.items():
setattr(result, k, deepcopy(v, memo))
return result
a = A()
a.v = 11
b1, b2 = copy(a), deepcopy(a)
a.v = 12
a.z.append(5)
print b1.v, b1.z
print b2.v, b2.z
prints
init
11 [2, 3, 4, 5]
11 [2, 3...
drag drop files into standard html file input
...t to use some of the dropped files
const dT = new DataTransfer();
dT.items.add(evt.dataTransfer.files[0]);
dT.items.add(evt.dataTransfer.files[3]);
fileInput.files = dT.files;
evt.preventDefault();
};
<!DOCTYPE html>
<html>
<body>
<div id="dropContainer" st...
How do you make lettered lists using markdown?
.... In this case, I just put the letter name after a bullet, like * A. List item.
– James M. Lay
Sep 8 '15 at 10:31
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