大约有 15,000 项符合查询结果（耗时：0.0297秒） [XML]
How to query MongoDB with “like”?
...st do a table scan, then it can certainly be expensive. If you're doing a 'starts with' regex query, then that can use an index. Best to run an explain() to see what's happening.
– Kyle Banker
Jul 22 '10 at 14:49
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How to check if PHP array is associative or sequential?
...s
Secondly, how to determine whether an array has sequential numeric keys, starting from 0
Consider which of these behaviours you actually need. (It may be that either will do for your purposes.)
The first question (simply checking that all keys are numeric) is answered well by Captain kurO.
For...
Decimal number regular expression, where digit after decimal is optional
...digits (\d*).
Depending on your usage or regex engine you may need to add start/end line anchors:
/^\d+\.?\d*$/
Debuggex Demo
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Mongodb Explain for Aggregation framework
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Starting with MongoDB version 3.0, simply changing the order from
collection.aggregate(...).explain()
to
collection.explain().aggregate(...)
will give you the desired results (documentation here).
For older versions &g...
How do we use runOnUiThread in Android?
... e.printStackTrace();
}
}
}
}.start();
}
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How do I fix “Failed to sync vcpu reg” error?
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Got this issue on Mac. After turn off VBox it started to work.
– 0x8BADF00D
Feb 18 '15 at 18:24
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Java Garbage Collection Log messages
... after GC, 1Gb max heap size
minor GC occurred 8109.128 seconds since the start of the JVM and took 0.04 seconds
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Vibrate and Sound defaults on notification
...e,You can try it.
protected void displayNotification() {
Log.i("Start", "notification");
// Invoking the default notification service //
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this);
mBuilder.setAutoCancel(true);
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What is exactly the base pointer and stack pointer? To what do they point?
... as you say it is, the top of the stack.
ebp is usually set to esp at the start of the function. Function parameters and local variables are accessed by adding and subtracting, respectively, a constant offset from ebp. All x86 calling conventions define ebp as being preserved across function calls...
How do I loop through a list by twos? [duplicate]
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You can also use this syntax (L[start:stop:step]):
mylist = [1,2,3,4,5,6,7,8,9,10]
for i in mylist[::2]:
print i,
# prints 1 3 5 7 9
for i in mylist[1::2]:
print i,
# prints 2 4 6 8 10
Where the first digit is the starting index (defaults to beg...