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MySQL和MongoDB设计实例进行对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...LE IF NOT EXISTS `mobiles` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` VARCHAR(100) NOT NULL,
`brand` VARCHAR(100) NOT NULL,
PRIMARY KEY (`id`)
);
CREATE TABLE IF NOT EXISTS `mobile_params` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`mobile_id` int...
How to edit multi-gigabyte text files? Vim doesn't work =( [closed]
...dit multi-gigabyte text files, perhaps by only loading small portions into memory at once? It doesn't seem like Vim can handle it =(
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How can I change an element's text without changing its child elements?
I'd like to update element's text dynamically:
14 Answers
14
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MongoDB: update every document on one field
I have a collected named foo hypothetically.
4 Answers
4
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Why can't stash be applied to the working directory?
... because it would be overwriting an existing file.
To fix, you could do something like deleting that file (it's okay, it's still in the repo), applying your stash, and then replacing the stashed version of the file with the in-repo version as appropriate.
Edit: It's also possible that the file has...
Android, ListView IllegalStateException: “The content of the adapter has changed but ListView did no
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I had the same issue.
I was adding items to my ArrayList outside the UI thread.
Solution: I have done both, adding the items and called notifyDataSetChanged() in the UI thread.
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calculating the difference in months between two dates
In C#/.NET TimeSpan has TotalDays , TotalMinutes , etc. but I can't figure out a formula for total months difference. Variable days per month and leap years keep throwing me off. How can I get TotalMonths ?
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String concatenation vs. string substitution in Python
...e and when of using string concatenation versus string substitution eludes me. As the string concatenation has seen large boosts in performance, is this (becoming more) a stylistic decision rather than a practical one?
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Cross-thread operation not valid: Control 'textBox1' accessed from a thread other than the thread it
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The data received in your serialPort1_DataReceived method is coming from another thread context than the UI thread, and that's the reason you see this error.
To remedy this, you will have to use a dispatcher as descibed in the MSDN article:
How to: Make Thread-Safe Calls to W...
Squash the first two commits in Git? [duplicate]
...he new commit (result of the squashing) will have no common ancestor.
That mean you can not "commit --amend" the initial commit into new one, and then rebase onto the new initial commit the history of the previous initial commit (lots of conflicts)
(That last sentence is no longer true with git reb...