大约有 47,000 项符合查询结果（耗时：0.0501秒） [XML]
Return a value if no rows are found in Microsoft tSQL
Using a Microsoft version of SQL, here's my simple query. If I query a record that doesn't exist then I will get nothing returned. I'd prefer that false (0) is returned in that scenario. Looking for the simplest method to account for no records.
...
Mysql adding user for remote access
I created user user@'%' with password 'password . But I can not connect with:
3 Answers
...
Is std::vector so much slower than plain arrays?
I've always thought it's the general wisdom that std::vector is "implemented as an array," blah blah blah. Today I went down and tested it, and it seems to be not so:
...
Rails I18n validation deprecation warning
I just updated to rails 4.0.2 and I'm getting this warning:
5 Answers
5
...
Generating random numbers in Objective-C
I'm a Java head mainly, and I want a way to generate a pseudo-random number between 0 and 74. In Java I would use the method:
...
ATL正则表达式库使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
ATL正则表达式库使用ATL中，由于ATL Server的需要，需要对Client发送过来的地址、命令等复杂文字字段信息解码，而正则表达式是公认的最强大的文字解析工具，所...ATL中，由于ATL Server的需要，需要对Client发送过来的地址、命令等...
When is a C++ destructor called?
Basic Question: when does a program call a class' destructor method in C++? I have been told that it is called whenever an object goes out of scope or is subjected to a delete
...
Why does i = i + i give me 0?
I have a simple program:
10 Answers
10
...
How does collections.defaultdict work?
I've read the examples in python docs, but still can't figure out what this method means. Can somebody help? Here are two examples from the python docs
...