大约有 48,000 项符合查询结果（耗时：0.0482秒） [XML]
Double vs. BigDecimal?
I have to calculate some floating point variables and my colleague suggest me to use BigDecimal instead of double since it will be more precise. But I want to know what it is and how to make most out of BigDecimal ?
...
SyntaxError: Use of const in strict mode
I'm working with node.js, and in one of my js files I'm using const in "strict mode" . When trying to run it, I'm getting an error:
...
How to find duplicates in 2 columns not 1
...composite key between the two fields. This will require a unique stone_id and upcharge_title for each row.
As far as finding the existing duplicates try this:
select stone_id,
upcharge_title,
count(*)
from your_table
group by stone_id,
upcharge_title
having coun...
How can I permanently enable line numbers in IntelliJ?
...log is slightly different, a General submenu has been added between Editor and Appearance as shown below
IntelliJ 8.1.2 - 13.X
From IntelliJ 8.1.2 onwards, this option is in File | Settings1. Within the IDE Settings section of that dialog, you'll find it under Editor | Appearance.
On a Mac, th...
How to get the primary IP address of the local machine on Linux and OS X? [closed]
I am looking for a command line solution that would return me the primary (first) IP address of the localhost, other than 127.0.0.1
...
Convert SQLITE SQL dump file to POSTGRESQL
...n POSTGRESQL. I just updated my local database with a huge amount of data and need to transfer a specific table to the production database.
...
Generate random numbers using C++11 random library
As the title suggests, I am trying to figure out a way of generating random numbers using the new C++11 <random> library. I have tried it with this code:
...
What is the difference between mutex and critical section?
... between the two of them. On my system for 1,000,000 uncontended acquires and releases, a mutex takes over one second. A critical section takes ~50 ms for 1,000,000 acquires.
Here's the test code, I ran this and got similar results if mutex is first or second, so we aren't seeing any other effect...
What is the difference between “text” and new String(“text”)?
...
new String("text");
explicitly creates a new and referentially distinct instance of a String object; String s = "text"; may reuse an instance from the string constant pool if one is available.
You very rarely would ever want to use the new String(anotherString) constru...
Named string formatting in C#
...
There is no built-in method for handling this.
Here's one method
string myString = "{foo} is {bar} and {yadi} is {yada}".Inject(o);
Here's another
Status.Text = "{UserName} last logged in at {LastLoginDate}".FormatWith(user);
A third improved method p...