大约有 47,000 项符合查询结果（耗时：0.0531秒） [XML]
Check that Field Exists with MongoDB
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188
Use $ne (for "not equal")
db.collection.find({ "fieldToCheck": { $exists: true, $ne: null } })...
Get current stack trace in Ruby without raising an exception
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185
You can use Kernel#caller:
# /tmp/caller.rb
def foo
puts caller # Kernel#caller returns an...
MongoDB/NoSQL: Keeping Document Change History
... body: [
{ version: 7, value: "Not bad" },
{ version: 8, value: "Not bad at all" }
]
}
]
}
Marking part of the document as deleted in a version is still somewhat awkward though. You could introduce a state field for parts that can be deleted/restored from your appl...
How can I create a UIColor from a hex string?
...F0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]
uicolor macro with hex values
Also formatted version of this code:
#define UIColorFromRGB(rgbValue) \
[UIColor colorWithRed:((float)((rgbValue & 0xFF0000)...
Can Vim highlight matching HTML tags like Notepad++?
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Greg SextonGreg Sexton
8,67966 gold badges2929 silver badges3434 bronze badges
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How do I convert seconds to hours, minutes and seconds?
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edited Feb 5 '19 at 18:31
Božo Stojković
2,64811 gold badge1818 silver badges4343 bronze badges
a...
List distinct values in a vector in R
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answered Oct 13 '11 at 14:08
csgillespiecsgillespie
52.3k1313 gold badges127127 silver badges169169 bronze badges
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Unable to access JSON property with “-” dash
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287
jsonObj.profile-id is a subtraction expression (i.e. jsonObj.profile - id).
To access a key th...
The quest for the Excel custom function tooltip
...de is wrapped as an Excel-DNA add-in, and works on my Excel 2013 / Windows 8 machine. I've tested on one other configuration (64-bit Excel 2010 on Windows Server 2008) and had a serious problems.
For a C# function defined with the Excel-DNA attributes like this:
[ExcelFunction(Description =
"...
View git history for folder
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182
You can use either foldername or foldername/*. Either way should work.
git log -- path/to/fold...