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在MongoDB中模拟Auto Increment - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...代码大致如下所示：
<?php
function generate_auto_increment_id($namespace, array $option = array())
{
$option += array(
'init' => 1,
'step' => 1,
);
$instance = new Mongo();
$instance = $instance->selectCollection('_seq', 'seq');
$seq = ...
How to check for file existence [duplicate]
Is there a Ruby class/method where I could pass "a full path", home/me/a_file.txt , to identify whether it is a valid file path?
...
Ordering by the order of values in a SQL IN() clause
...se MySQL's FIELD() function:
SELECT name, description, ...
FROM ...
WHERE id IN([ids, any order])
ORDER BY FIELD(id, [ids in order])
FIELD() will return the index of the first parameter that is equal to the first parameter (other than the first parameter itself).
FIELD('a', 'a', 'b', 'c')
will ...
Revert changes to a file in a commit
I want to revert changes made by a particular commit to a given file only.
8 Answers
8...
Concatenate multiple files but include filename as section headers
I would like to concatenate a number of text files into one large file in terminal. I know I can do this using the cat command. However, I would like the filename of each file to precede the "data dump" for that file. Anyone know how to do this?
...
How to git log in reverse order?
...lias. Open up your favorite text editor and open up your global .gitconfig file. It's usually found in your home directory.
Navigate to or create a section like this:
[alias]
lg = log -10 --reverse
That creates a git alias that grabs the ten most recent commits then reverses that list so the...
How do you reset the Zoom in Visual Studio 2010 and above
... out.
to do manually goto
preference->settings
and UserSetting file will be opened in the editor change.For default zoom
window.zoomlevel:0
and to zoom in
window.zoomlevel:1,2,3......
share
...
Is there a way to loop through a table variable in TSQL without using a cursor?
...be possible to loop using just SELECT statements as shown below:
Declare @Id int
While (Select Count(*) From ATable Where Processed = 0) > 0
Begin
Select Top 1 @Id = Id From ATable Where Processed = 0
--Do some processing here
Update ATable Set Processed = 1 Where Id = @Id
End
...
What's the fastest way to read a text file line-by-line?
I want to read a text file line by line. I wanted to know if I'm doing it as efficiently as possible within the .NET C# scope of things.
...
Keep file in a Git repo, but don't track changes
I have several files in a CodeIgniter site that I will want to have in the repo but not track any changes on.
6 Answers
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