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boost Composite keys - C/C++ - 清泛网 - 专注C/C++及内核技术
...modeled by means of composite_key, as shown in the example:
struct phonebook_entry
{
std::string family_name;
std::string given_name;
std::string phone_number;
phonebook_entry(
std::string family_name,
std::string given_name,
std::string phone_number):
family...
SQL Server 2005 How Create a Unique Constraint?
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Warning: Only one null row can be in the column you've set to be unique.
You can do this with a filtered index in SQL 2008:
CREATE UNIQUE NONCLUSTERED INDEX idx_col1
ON dbo.MyTable(col1)
WHERE col1 IS NOT NULL;
See Field value must be ...
JBoss vs Tomcat again [closed]
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First the facts, neither is better. As you already mentioned, Tomcat provides a servlet container that supports the Servlet specification (Tomcat 7 supports Servlet 3.0). JBoss AS, a 'complete' application server supports Java EE 6 (including Servlet 3.0) in its current version.
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Import SQL dump into PostgreSQL database
We are switching hosts and the old one provided a SQL dump of the PostgreSQL database of our site.
15 Answers
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Asynchronously wait for Task to complete with timeout
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It should be mentioned that even though Task.Delay can complete before long running task, allowing you to handle a timeout scenario, this does NOT cancel the long running task itself; WhenAny simply lets you know that one of the tasks passed t...
How to Store Historical Data
...m.
If you look closely, most requirements for historical data fall into one of two categories:
Audit logging: This is better off done with audit tables. It's fairly easy to write a tool that generates scripts to create audit log tables and triggers by reading metadata from the system data dic...
What data type to use for hashed password field and what length?
... functions that conveniently packages this information as a single string: one that takes the algorithm indicator, the hardness indicator and the password, generates a random salt and returns the full hash string; and one that takes a password and the full hash string as input and returns a boolean ...
Why is __init__() always called after __new__()?
I'm just trying to streamline one of my classes and have introduced some functionality in the same style as the flyweight design pattern .
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程序员之网络安全系列（六）：动态密码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...要让他在一定时间有效就可以了，这就是OTP.
动态口令 (One Time Password)
动态密码： 一个OTP(One Time Password) 是一个密码仅用于一次登录会话或者交易，使用过后，这个密码就无效了。
静态密码的问题：
容易被破解
容易被猜测...
How to check if a particular service is running on Ubuntu
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Any idea why one service is marked with [-] {name} but sudo service {name} status shows as running?
– Mark Murphy
Nov 17 '14 at 14:16
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