大约有 43,000 项符合查询结果（耗时：0.0668秒） [XML]
SQLAlchemy: What's the difference between flush() and commit()?
What the difference is between flush() and commit() in SQLAlchemy?
5 Answers
5
...
How does Dijkstra's Algorithm and A-Star compare?
I was looking at what the guys in the Mario AI Competition have been doing and some of them have built some pretty neat Mario bots utilizing the A* (A-Star) Pathing Algorithm.
...
Java default constructor
What exactly is a default constructor — can you tell me which one of the following is a default constructor and what differentiates it from any other constructor?
...
Check if a string matches a regex in Bash script
One of the arguments that my script receives is a date in the following format: yyyymmdd .
5 Answers
...
mongodb: insert if not exists
Every day, I receive a stock of documents (an update). What I want to do is insert each item that does not already exist.
8...
How should I choose an authentication library for CodeIgniter? [closed]
I see there are a few . Which ones are maintained and easy to use? What are their pros and cons?
11 Answers
...
How to force link from iframe to be opened in the parent window
I need to open the link in the same parent page, instead of open it in a new page.
13 Answers
...
conditional unique constraint
I have a situation where i need to enforce a unique constraint on a set of columns, but only for one value of a column.
6 A...
Cleaner way to do a null check in C#? [duplicate]
Suppose, I have this interface,
19 Answers
19
...
Java SafeVarargs annotation, does a standard or best practice exist?
I've recently come across the java @SafeVarargs annotation. Googling for what makes a variadic function in Java unsafe left me rather confused (heap poisoning? erased types?), so I'd like to know a few things:
...