lookup-tables

问题 I am working on a custom data structure and I am currently in the beta testing process: The data will be stored within an array and this array can be represented as a 4D, 2D & 1D array. These three arrays are declared within a union since it represents the same memory addressing. Here is the declaration to my class: SomeClass.h #ifndef SomeClass_H #define SomeClass_H class SomeClass { public: static const unsigned V1D_SIZE; // Single Or Linear Array Representation : Size 256 - 256 Elements

问题 I have a data frame with two columns. The second column contains only integers. More precisely it contains 0,1,2,3 and some NA's. Something like this: id1 0 id2 1 id3 0 id4 2 id5 3 id6 1 id7 2 id8 NA What I'm searching for is a command which changes 0 into ZZT the 1 into ZZU and so on. The NA's should stay as NA's. How could this work? I tried a for loop in combination with some if-statements but this doesn't work. I know such changing thinks are pretty easy in R but it seems that I have a

问题 Consider a lookup function with the following signature, which needs to return an integer for a given string key: int GetValue(string key) { ... } Consider furthermore that the key-value mappings, numbering N, are known in advance when the source code for function is being written, e.g.: // N=3 { "foo", 1 }, { "bar", 42 }, { "bazz", 314159 } So a valid (but not perfect!) implementation for the function for the input above would be: int GetValue(string key) { switch (key) { case "foo": return

问题 As part of my domain model, lets say I have a WorkItem object. The WorkItem object has several relationships to lookup values such as: WorkItemType : UserStory Bug Enhancement Priority : High Medium Low And there could possibly be more, such as Status , Severity , etc... DDD states that if something exists within an aggregate root that you shouldn't attempt to access it outside of the aggregate root. So if I want to be able to add new WorkItemTypes like Task, or new Priorities like Critical,

问题 I have one table which has two columns with data code points like . These code points need to be changed with japanese characters. I have a lookup table of these code points with the japanese characters. But the problem is in both of the columns there are multiple code points in single rows. Main table:- Id body subject 1 <U+9876> Hi <U+1234>No <U+6543> <U+9876> Hi <U+1234>No <U+6543> 2 <U+9826> <U+5678><U+FA32> data <U+9006> <U+6502> Lookup table :- char value <U+9876> だ <U+9826> づ I tried

问题 I have to find a very optimal way to find the frequency of a character in a very very long file containing words,(cases are ignored, should count both Lower case and Upper case) using C/C++. I already know one which is this (here i am reading input from user at terminal but in my case i will be reading from file, so please do not go to gets() function, please focus on my main objective which is to get a more optimized way than this (if any is possible) ): int main() { char string[100]; int c

问题 Say I want users to pick one or more contact methods (email, phone, fax, other, etc). And if they choose other, then they can enter a single contact method of their own. What's the best way to store this in a database? I see three possibilities: Use a set datatype column, plus a single "other_contact" varchar column to store the optional user-entered value. Use many-to-many, and a user-entered column. So there would be a user table, a contact_method table, and a user_contact_method table that

问题 This is possibly an easy one that I can't seem to get past. I've created a "Product" class which has a list of "Accessories". Each "Accessory" is just another product referenced by a lookup table. Table setup: Product ------- ProductID int Name varchar(200) AccessoryProduct ---------------- ID int ParentProductID int ChildProductID int I'd like to be able to access this list of accessories in a manner such as: foreach(Product p in product.Accessories) string s = p.Name; The part I'm stumped

问题 I need to update a table column in one table with data from another based on whether a specific id matches. Basically, I have the following schema: TABLE accounts FIELD old_user_id TABLE users FIELD old_user_id FIELD new_user_id I need to loop through all old_user_id's in the accounts table checking them against the old_user_id field in the users table, and then take the new_user_id value in the users table and replace the old_user_id value in the accounts table. Seems like a simple thing to

问题 I have a Domain Class setup similar to this class NewsStory { String headline static hasMany = [channels:Channel] static mapping = { table 'NewsStory' addresses joinTable:[name:'Article_Channel', key:'ArticleId', column:'ChannelId'] } } in the Article_Channel table i need to have an extra column populated called ArticleType say. Its value will always be the same e.g. 'news' for this domain class, but will be differnt for others e.g. 'blog' Channel is just something like 'Security' etc Is