warehouse objective

How to Create a proxy in Objective-C and create an objective-c First, we need to create a class. In order to facilitate understanding, we will simulate finding an intermediary to rent a house in real life. Therefore, we need to create a Person class first. 1. Define the proxy protocol in Person. h and complete the proxy method declaration: the code is as follows: 1 // Person. h文2 2 3 # import Note: The opt

Encapsulation, inheritance, polymorphism, and Objective-C polymorphism in objective-c Advantages of encapsulation: Benefits of inheritance: Notes for inheritance: Inheritance and combination: 1 @ interface Score: NSObject 2 {3 int _ cScore; 4 int _ ocScore; 5} 6 @ end 7 8 @ implementation Score 9 @ end10 11 @ interface Student: NSObject12 {13 Score * _ socret; // The combination is used here, because it can

Custom slideshow widget in Objective-c ui, objective-cui The following is a custom carousel image class ImageLoop inherited from UIView. The class ImageLoop contains a UIScrollView and UIPageControl, which defines three attributes: PageControll, position, currentPage can customize the pageControl style, you can also use position to control the playback direction, or set to start playing from an image whose

Objective-C compound and objective-c COMPOUND I want to talk about Composite Learning faster with questions What is composite? What are the advantages? When to use composite? What is dependency? How can this problem be solved? Composite is to combine some individual components to form a whole. (One class defines another class as an instance variable) Advantages: 1. Reference other objects to the newly creat

Objective-C: 10-NSDate and NSDateFormatter, objective-cnsdate NSDate NSDate time class, inherited from NSObject, whose object represents a time point NSDate *date = [NSDate date]; NSLog(@"date = %@", date); 19:08:00. 624 OCNSDate [2955: 309612] date = 11:08:00 + 0000 Print the displayedGreenwich time-month-day hour: minute: Second + Time Zone 1. Get a method to create a time point from the current

Objective-C's total Runtime (1) message mechanism [conversion], objective-cruntime RunTime is short for RunTime. It is the mechanism of the system when it is running, the most important of which is the message mechanism. For C language, function calls determine which function to call during compilation (for details about C language function calls, refer to here ). After the compilation is complete, it is ex

Objective-c series-NSMutableString, objective-c **************************************** ****** NSMutableString is a subclass of NSString. In addition to the parent class method, NSMutableStirng also has some addition, deletion, modification, and replacement methods. **************************************** ****** Constructor A newly added constructor: NSMutableString * mstring = [[NSMutableString alloc] in

Objective-c variables and Objective-c Variables Language variables in OC can be divided into local variables and global variables by scope. Local variables: these are also called internal variables. Local variables are declared within the method. Its scope is limited to the method. It is invalid to leave this method and then use this variable. Global variable, also known as an external variable, is a varia

[Study Notes-Objective-C] Chapter 10 variables and Data Types in Objective-C Programming 6th, objectivec static variables Part 1. instance variables and attributes The current trend is to use (_) as the start character of the instance variable name. In the implementation part, explicitly declare that the instance variable is private ThereforeNoIn the subclass, you can directly obtain the instance v

Objective-C basic notes (3) OC memory management, objective-cocObjective-C memory basic management Each variable in OC Stores the reference counter. When the reference counter of this object is 0, the object will be recycled. When an object is created using alloc, new, or copy, the Reference Counter of the object is set to 1. Send a retain message to the object, which can include the reference counter plus

Objective-c syntax (4), objective-c syntax String in oc Quickly create strings (the simplest method) NSStirng * str = @ "Hello"; // oc strings are in the form @ "" The oc string is also a Class Object and is an NSString class object. It is not so troublesome to create it. [] use the object-oriented idea to manipulate the string. Char * name = "xxxxx"; // c-style string Oc uses % @ output string, not % s NSS

Objective-c syntax (2), objective-c syntax Common Errors in the description and definition of oc classes 1. There is only a class declaration and no class implementation. 2. @ end missing 3. @ interface and @ implementation are nested, that is, @ interface or @ implementation and @ end must appear in pairs! The two cannot be nested. 4. member variables are not written in brackets 5. The method declaration i

21 principles of data warehouse design-7 steps, 7 taboos and 7 ideas Seven steps for efficient data warehouse implementation The data warehouse has some kinship with our common RDBMS systems, but it is different. If you have not implemented a data warehouse, from setting goals to providing design, from creating a d

The following is an excerpt from the Internet and collated.Noun:BI (Business Intelligence): Commercial Intelligence,DW (Data Warehouse): Warehouse, see the Text Q1 section.OLTP (on-line Transaction processing): Online transaction processingAlso known as the transaction-oriented processing system, its basic characteristic is that the customer's raw data can be transferred to the computing center immediately

Design | data [For the convenience of their own reading so collect and organize here, Www.DMResearch.net] 21 Principles of Data Warehouse design --7 steps, 7 taboos and 7 ways of thinking Seven steps to efficiently implement a data warehouse The data warehouse is somewhat related to our common RDBMS system, but it is different. If you have not implemented

The following content is taken from the Internet and sorted out. Terms: Bi (Business Intelligence): Business Intelligence, DW (data warehouse): Data Warehouse. For details, see section Q1. OLTP (on-line transaction processing): Online Transaction Processing It is also known as a transaction-oriented processing system. Its basic feature is that the customer's raw data can be immediately transmitted to the

　　Seven steps for efficient data warehouse implementation The data warehouse has some kinship with our common RDBMS systems, but it is different. If you have not implemented a data warehouse, from setting goals to providing design, from creating a data structure to writing data analysis programs, to evaluating the users who are picky about it, the whole process w

Objective-C adds the object-oriented Feature Based on the C language through a new set of syntax. The OC syntax frequently uses braces ([]) and does not limit writing very long method names, which often makes many people think the language is lengthy. The code written in this way is very readable, but C ++ and Java programmers are not very comfortable with it. OC linguistics is very fast, but there are a lot of subtle details to note, and there are ma

Function modules of the Warehouse Management System: 1. the system function setting module allows you to customize the management rules of the entire system, including the functions of defining administrators and operating passwords; 2. the basic information maintenance module generates a unique basic bar code serial number tag for each batch of products. You can define the serial number according to your needs. Each type of product has a fixed en

Policy | data 6 Strategies of Data Warehouse implementation In the implementation of the data warehouse, the need for theoretical guidance, with the development of data Warehouse technology, Data Warehouse implementation strategy has been from the original "Top-down" a model developed to six models. 1, "Top-down"