大约有 1,400 项符合查询结果（耗时：0.0167秒） [XML]
Check that Field Exists with MongoDB
..."1234"
"open":"Yes"
"things":{
"paper":1234
"bottle":"Available"
"bottle_count":40
}
}
We want to know if the bottle field is present or not?
Ans:
db.products.find({"things.bottle":{"$exists":true}})
...
How does a debugger work?
...dware debugging registers. Following is from that chapter:
T (trap) flag, TSS — Generates a debug exception (#DB) when an attempt is
made to switch to a task with the T flag set in its TSS.
I am not sure whether Window or Linux use this flag or not, but it is very interesting to read that chapte...
Performing Breadth First Search recursively
...= bfsNumForest(i+1, q)
val (bb, qqq) = qq.dequeue
val (aa, tss) = qqq.dequeue
tss.enqueue[org.dg.collection.BFSNumber.Tree[Int]](Node(i, aa, bb))
}
}
}
def bfsNumTree[T](t: Tree[T]): Tree[Int] = {
val q = Queue.Empty.enqueue[Tree[T]](t)
val qq = bfsNumForest(1, q)
...
Is there a “do … while” loop in Ruby?
... begin
n = 99
buf = ""
begin
buf << "#{n} bottles of beer on the wall\n"
# ...
n -= 1
end while n > 0
buf << "no more bottles of beer"
end
end
Originally written by Jeremy Voorhis. The content has been copied here because...
Install go with brew, and running the gotour
...ow/tab:
$ brew install go
==> Downloading https://homebrew.bintray.com/bottles/go-1.7.1.sierra.bottle.tar.gz
Already downloaded: /Users/nigel/Library/Caches/Homebrew/go-1.7.1.sierra.bottle.tar.gz
==> Pouring go-1.7.1.sierra.bottle.tar.gz
==> Caveats
As of go 1.2, a valid GOPATH is required...
How to implement a queue using two stacks?
...st In First Out (LIFO) in computer science.
Lets imagine our stack like a bottle as below;
If we push integers 1,2,3 respectively, then 3 will be on the top of the stack. Because 1 will be pushed first, then 2 will be put on the top of 1. Lastly, 3 will be put on the top of the stack and latest ...
Unresolved Import Issues with PyDev and Eclipse
... in the interpreter you are using in your project, in my case I was using "bottle" and the folder I added was "c:\Python33\Lib\site-packages\bottle-0.11.6-py3.3.egg"
Now I don't see the error anymore, and the code completion feature works as well with "bottle".
...
facebook: permanent Page Access Token?
..."accounts" does not exist, even for v2.7: https://graph.facebook.com/v2.7/{page_id}?fields=access_token&access_token={long_lived_access_token}
– Reado
Jul 23 '16 at 9:07
...
How do I convert CamelCase into human-readable names in Java?
...mple XML Parser]
"GL11Version", // [GL 11 Version]
"99Bottles", // [99 Bottles]
"May5", // [May 5]
"BFG9000", // [BFG 9000]
};
for (String test : tests) {
System.out.println("[" + splitCamelCase(test) + "]");
}
It...
What is the correct way to start a mongod service on linux / OS X?
...e.
$ brew install mongodb
==> Downloading https://homebrew.bintray.com/bottles/mongodb-3.0.6.yosemite.bottle.tar.gz ### 100.0%
==> Pouring mongodb-3.0.6.yosemite.bottle.tar.gz
==> Caveats
To have launchd start mongodb at login:
ln -sfv /usr/local/opt/mongodb/*.plist ~/Library/LaunchAgent...