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搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...nfig/data --port 21000 --logpath /data/mongodbtest/config/log/config.log --fork
7、在每一台服务器分别启动mongos服务器。
/data/mongodbtest/mongodb-linux-x86_64-2.4.8/bin/mongos --configdb 192.168.0.136:21000,192.168.0.137:21000,192.168.0.138:21000 --port 20000 --logp...
NULL vs nil in Objective-C
In observeValueForKeyPath:ofObject:change:context: - why do the docs use NULL instead of nil when not specifying a context pointer?
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How to update only one field using Entity Framework?
...this code work by adding db.Configuration.ValidateOnSaveEnabled = false; before db.SaveChanges() ?
– Jake Drew
Jul 8 '13 at 6:19
3
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Difference between “read commited” and “repeatable read”
...a simple task like the following:
BEGIN TRANSACTION;
SELECT * FROM T;
WAITFOR DELAY '00:01:00'
SELECT * FROM T;
COMMIT;
That is a simple task that issue two reads from table T, with a delay of 1 minute between them.
under READ COMMITTED, the second SELECT may return any data. A concurrent tran...
What's the difference between a POST and a PUT HTTP REQUEST?
... but paradoxically PUT responses are not cacheable.
HTTP 1.1 RFC location for PUT
HTTP POST:
POST sends data to a specific URI and expects the resource at that URI to handle the request. The web server at this point can determine what to do with the data in the context of the specified resource...
WHERE vs HAVING
Why do you need to place columns you create yourself (for example select 1 as "number" ) after HAVING and not WHERE in MySQL?
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How do I use the conditional operator (? :) in Ruby?
... if is also an expression so: if a then b else c end === a ? b : c, except for precedence issues. Both are expressions.
Examples:
puts (if 1 then 2 else 3 end) # => 2
puts 1 ? 2 : 3 # => 2
x = if 1 then 2 else 3 end
puts x # => 2
Note that in the ...
菜单的背景颜色 - C/C++ - 清泛网 - 专注C/C++及内核技术
...;//获得子菜单（如果有）0表示索引，对应“文件”菜单
for(int i=0;i<3;i++)
{
CBitmap bmp;
bmp.LoadBitmap(IDB_BITMAP1+i);
pSubMenu->SetMenuItemBitmaps(i,MF_BYPOSITION,&bmp,&bmp);
bmp.Detach();
}
CBitmap bmp;
CBrush m_BKBrush;
bmp.LoadBitmap(IDB_MENUBA...
How do I auto-reload a Chrome extension I'm developing?
I'd like for my chrome extension to reload every time I save a file in the extension folder, without having to explicitly click "reload" in chrome://extensions/. Is this possible?
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Android, How to limit width of TextView (and add three dots at the end of text)?
...t characters of it. Actually, I can do this but the thing that I'm looking for is how to add three dots (...) at the end of string. This one shows the text has continue. This is my XML but there is no dots although it limit my text.
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