大约有 46,000 项符合查询结果（耗时：0.0576秒） [XML]
Maximum packet size for a TCP connection
...ld use a lower one. With the advent of jumbo frames, there is no real specified maximum, and the maximum varies depending on the hardware and driver.
– WhirlWind
Apr 10 '10 at 17:08
...
Appropriate datatype for holding percent values?
..., the data type you use depends on how you plan to store your percentages. If you are going to store their fractional equivalent (e.g. 100.00% stored as 1.0000), I would store the data in a decimal(5,4) data type with a CHECK constraint that ensures that the values never exceed 1.0000 (assuming that...
Simplest way to do a fire and forget method in c# 4.0
...e the warning that tells you you're running this Task as fire and forget.
If the method inside the curly braces returns a Task:
#pragma warning disable 4014
Task.Run(async () =>
{
await MyFireAndForgetMethod();
}).ConfigureAwait(false);
#pragma warning restore 4014
Let's break that down:
...
What is the difference between sites-enabled and sites-available directory?
...
The difference is that virtual sites listed in the sites-enabled directory are served by apache. In the sites-available directory there are the virtual sites that exist on your server but people can't access them because they are ...
Debug vs. Release performance
...piled at all
some loop variables are taken out of the loop by the compiler if they are proven to be invariants
code written under #debug directive is not included, etc.
The rest is up to the JIT.
Full list of optimizations here courtesy of Eric Lippert.
...
Getting the first index of an object
...
If the order of the objects is significant, you should revise your JSON schema to store the objects in an array:
[
{"name":"foo", ...},
{"name":"bar", ...},
{"name":"baz", ...}
]
or maybe:
[
["foo", {}],
...
How to set downloading file name in ASP.NET Web API
...need to be escaped like a ;. You should use the accepted answer Darin made if your file name could contain a semi-colon.
Add a Response.AddHeader to set the file name
Response.AddHeader("Content-Disposition", "attachment; filename=*FILE_NAME*");
Just change FILE_NAME to the name of the file.
...
PostgreSQL - max number of parameters in “IN” clause?
In Postgres, you can specify an IN clause, like this:
8 Answers
8
...
Maintain/Save/Restore scroll position when returning to a ListView
...isible list item. But this item may be partially scrolled out of view, and if you want to restore the exact scroll position of the list you need to get this offset. So ListView.getChildAt(0) returns the View for the top list item, and then View.getTop() - mList.getPaddingTop() returns its relative o...
Rails migration for has_and_belongs_to_many join table
...
@hoffmanc It will generate an empty migration file if you do not specify any fields. You must specify the fields if you want Rails to automatically add them to the migration file.
– Andrew
Jan 21 '15 at 19:44
...