大约有 47,000 项符合查询结果（耗时：0.0304秒） [XML]
What is the copy-and-swap idiom?
...ent operator is arguably the most nuanced and difficult. How should it be done? What pitfalls need to be avoided?
The copy-and-swap idiom is the solution, and elegantly assists the assignment operator in achieving two things: avoiding code duplication, and providing a strong exception guarantee.
H...
Which is faster/best? SELECT * or SELECT column1, colum2, column3, etc
...
One reason that selecting specific columns is better is that it raises the probability that SQL Server can access the data from indexes rather than querying the table data.
Here's a post I wrote about it: The real reason s...
Clojure differences between Ref, Var, Agent, Atom, with examples
...en two Identities needs to change together, the classic example is moving money from one bank account to another, it needs to either move completely or not at all.
Uncoordinated access is used when only one Identity needs to update, this is a very common case.
Synchronous access is used when th...
Describe the architecture you use for Java web applications? [closed]
...
Ok I'll do a (shorter) one:
Frontend : Tapestry (3 for older projects, 5 for newer projects)
Business layer: Spring
DAO's : Ibatis
Database : Oracle
We use Sping transaction support, and start transactions upon entering the service layer, propa...
Java: Get last element after split
...cal variable and use the array's length field to find its length. Subtract one to account for it being 0-based:
String[] bits = one.split("-");
String lastOne = bits[bits.length-1];
Caveat emptor: if the original string is composed of only the separator, for example "-" or "---", bits.length will...
What is middleware exactly?
....
Someday the client thought, why don't we integrate all our systems into one huge system. Ten minutes later their IT department said that will take 2 years.
You (the wise developer) said, why don't we just integrate all the different systems and make them work together in a homogeneous environmen...
When should I write the keyword 'inline' for a function/method?
...
Oh man, one of my pet peeves.
inline is more like static or extern than a directive telling the compiler to inline your functions. extern, static, inline are linkage directives, used almost exclusively by the linker, not the compil...
Architecture for merging multiple user accounts together
...e accounts, the solution is pretty simple. While the user is logged in on one of the accounts, he logs into another which he previously used to log into the site (via the control panel feature above). The web service detects this collision (that the local identity of the logged-in user differs fro...
What is the dual table in Oracle?
...
It is a dummy table with one element in it. It is useful because Oracle doesn't allow statements like
SELECT 3+4
You can work around this restriction by writing
SELECT 3+4 FROM DUAL
instead.
...
How can I remove the outline around hyperlinks images?
...
For Remove outline for anchor tag
a {outline : none;}
Remove outline from image link
a img {outline : none;}
Remove border from image link
img {border : 0;}
share
|
...