architecture

问题 Inspired by this question (Find an integer not among four billion given ones). How much storage space would it require to store an integer that was the summation of the numbers 1 to 4 billion? For example, 1+2+3+4+5 = 15. Summation of 1 to 1 million = 500,000,500,000. Here is an algorithm that may help 回答1: The function you link to describe how to find the n'th Triangular Number, which is defined as the sum of the n natural numbers from 1 to n. Substituting 4 billion as n into the function

问题 Inspired by this question (Find an integer not among four billion given ones). How much storage space would it require to store an integer that was the summation of the numbers 1 to 4 billion? For example, 1+2+3+4+5 = 15. Summation of 1 to 1 million = 500,000,500,000. Here is an algorithm that may help 回答1: The function you link to describe how to find the n'th Triangular Number, which is defined as the sum of the n natural numbers from 1 to n. Substituting 4 billion as n into the function

问题 I have a problem to decide which layer in my system should create DataContext. I have read a book, saying that if do not pass the same DataContext object for all the database updates, it will sometimes get an exception thrown from the DataContext. That's why i initially create new instance of DataContext in business layer, and pass it into data access layer. So that the same datacontext is used for all the updates. But this lead to one design problem, if i wanna change my DAL to Non-LinqToSQL

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . I have a bunch of large XML files (total size of all files is more than 1 GB) and I need to transform them from a vendor schema to our schema. The vendor has one ZIP file (it contains large XML files) at some FTP location on its server. I have to pick that ZIP file up and then transform all available XML files.

问题 I have a Purchase FactTable with some measures and dimension keys. Then, there's another another table: Discount Table. Purchase FactTable is in a 1-N relationship with Discount Table (for each purchase I might have bought several discounted items). Discount table has some attributes (description, note) and some numeric values (for example: discount in $) that I would like to roll-up. If I create a dimension out of this Discount Table, I'll get a wrong number of purchase counts in a sum count

问题 I want to trace with a LKM the sys_connect and sys_accept right after these system calls return. I found that kprobes can give you access to the registers when a probed system call returns, by defining a post handler. My problem is that I don't know how to get the system call parameters from the data that I have in the post handler (i.e. the struct pt_regs) The post handler is defined like that: void post_handler(struct kprobe *p, struct pt_regs *regs, unsigned long flags); 回答1: This

问题 ok im doing a heavy process on processing each email. lets say im making an AI for a system at he will auto-reply the email that he receive, but im still dont know where to start. heres what im thinking of architecture 1 problems : lets say we have 1000 emails / sec how does a mail server, exim or sendmail, davecot etc exactly work? can the parseandsavetomysql.py process 1000 emails in a sec though piping? how does that work too? btw currently its working fine, but i need to know about this.

问题 So like most new .NET developers you start of passing DataSets everywhere and although things do the job it doesn't seem right. The next progression is usually to create entity objects that extend a DAL base class so you have i.e. public class User : UserDAL { //User specific methods } public class UserDAL { //Bunch of user specific properties public User Load(int Id) { //Some low level ADO calls } private User LoadFromDataSet(DataSet ds) { //Load entity properties from DataSet } } User

问题 I am learning Swfit and i start studied from below link https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/ https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Initialization.html I have question regarding Initialization in swift . What i understand is as below 1] It works like a constructor for swift classes. 2] We have to initialize all properties in it. 3] We have to call init() method of super

问题 The Agile architecture question makes me wonder this. Does it depends of what is being build ? Do applications (I mean single computing program here) have an architecture ? UPDATE: to try to clarify the question, I'll give my opinion on the question: I defined the architecture as the cutting of the system in components, and the relationships between the components ;while the design is about the interns of the component. Is this opinion shared ? 回答1: It's really fairly simple: architecture is