differences in discount activities, how can I write a code change that reduces the probability of a business trip when the discount activity is modified?
Think about using the following policy mode:
First, let's take a look at the discounted interface that can be released independently:
public interface IDiscount {double getPrice(double price, int quantity);}
The following are two
Rule EngineThe rule engine, developed by the inference engine, is a component embedded in an application that separates business decisions from application code and writes business decisions using predefined semantic modules. Accept data entry, interpret business rules, and make business decisions based on business rules.Personal understandingThe point of change is too concentrated, in order to accommodate the changes, and to write each of the various scenarios with their own code logic for that
Stored Procedure:1. CustOrderHist:Create procedure CustOrderHist @ CustomerID nchar (5)ASSELECT ProductName, Total = SUM (Quantity)FROM Products P, [Order Details] OD, Orders O, Customers CWhere c. CustomerID = @ CustomerIDAnd c. CustomerID = O. CustomerID and o. OrderID = OD. OrderID and od. ProductID = P. ProductIDGroup by ProductNameGOFunction: name of the product ordered by the customer name {@ CustomerID nchar (5)}, product quantity2. CustOrdersDetailCreate procedure CustOrdersDetail @ Orde
of a product table.
Well, add a field to the table. HasDiscount indicates whether there is a discount.
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Insert some data.
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One scenario is to query the product. one of the conditions i
users can obtain different presentation layers. In this example, we assume three users:General users, Senior users and internal users. Different users have different presentation views. For example, the discount rates of users of different levels are different, which leads to different retail prices, while internal users may need to obtain product suppliers.. Product Information, supplier information, and discoun
When a travel agent bookings with the airline, the airline will give a certain discount according to the booking amount.The larger the booking volume, the higher the discount. If the booking amount is less than 10, the discount rate is 10%;If the booking amount is greater than or equal to 10 sheets and less than 20, the disco
*2 + 16.7*2>>> L58.4
6. How can I get a decimal result of 9/2?>>> A = 9>>> A/= 2>>>4>>> A = 9.0>>> A/= 2>>>4.5
7. python computing 7*7*7*7*7. How many writing methods can be used?>>> A = 7>>> B = pow (7, 4)>>> B2401>>> C = 7 ** 4>>> C2401>>> D = 7*7*7*7>>> D2401
8. Write a program to convert the temperature from Fahrenheit to Celsius. The conversion formula is C = 5/9 * (F-32)>>> F = int (raw_input ("Enter the Fahrenheit temperature :"))Enter the Fahrenheit temperature: 90>>> C = (F-32)/(9/5)>>>
Hit the course with the code: actually there are a lot of pits, and then studySupermarket Category: classSuppermarket {//Create a Warehouse objectCangku ck =NewCangku (); PublicSuppermarket () {ck. Jinpros ("Acer", +); Ck. Jinpros ("SamSung", +); Ck. Jinpros ("jiangyou", +); Ck. Jinpros ("Banana", +); } /// ///the process of interacting with the user/// Public voidaskbuying () {Console.WriteLine ("Welcome, may I ask what you need? "); Console.WriteLine ("we have Acer,
The reciprocal of expected sort based on hierarchical correlationSummaryMany of the indicators for evaluating the results of information retrieval can be used in binary correlation situations, and there is only one indicator that can usually be used for hierarchical correlation, namely, the cumulative gain (DCG) of the discount. One drawback of this indicator is its added nature and potential independence hypothesis: the document at a given location a
Python uses the first-class function to implement the design mode, and the python Design Mode
Case study: Restructuring the "Policy" Model
Some design patterns can be simplified if the functions used as first-class objects are reasonably used, and the "Policy" pattern is a good example.
Classic "policy" Mode
UML class diagram for processing order discounts in "policy" Design Mode
The e-commerce industry has a feature that can obviously use the "Policy" model, that is, calculate the
Topic:Bookstore for the "Harry Potter" series of books for promotional activities, a total of 5 volumes, with numbers 0, 1, 2, 3, 4, a single volume of 8 yuan, the specific discount is as follows:Discount on this number2 5%3 10%4 20%5 25%Depending on the number of volumes purchased and this number, different discount rules will be applicable. The singular book only corresponds to one
the enterprise's expected profitability and the appropriate discount rate. This method evaluates different individual assets within an enterprise as a unified and inseparable element. It is not a simple sum of individual assets, however, the capitalization price under the normal operating conditions of an enterprise reflects the future profitability of the enterprise's assets as a whole, and reveals the internal value of the enterprise. Therefore, th
. In order to make it easier to discount the cash flow of the product to the age of 30, the income is uncertain due to the dividend of the person who receives the product, and the product dividend is assumed to be zero.
Model Creation:
1. Set the discount interest rate (the ROI of insurance companies) to R;
2. the warranty period is from X: 30 ~ 100 years old;
3. The current INPV (x, R) and INPV (x, R) of t
. Java
Package COM. observer1; public class customerone implements observer {subject; string goodsname, personname; Public customerone (subject, string personname) {This. personname = personname; this. subject = subject; subject. addobserver (this);} public void Update () {If (subject instanceof shopsubject) {goodsname = (shopsubject) subject ). getgoodsname (); system. out. println (personname + "interested only in the name of the discounted product:"); system. out. println ("the name of the
I. Problems
There are a total of five flags in the "Harry Potter" series. Assume that each volume is sold separately for 8 euros. If you purchase two different volumes at a time, you can deduct 5% of the fee, and the three volumes are more. Assume that the discount is as follows:
2 discount 5%
3 discounts: 10%
4 discounts: 20%
5 discounts: 25%
There is a certain demand for books, but different discounts can
Cookie is a technology that maintains HTTP status information on the client. It is like a discount card issued by a mall. When a customer closes a shopping bill in a mall, the mall can decide whether to give the customer a discount card. The information recorded on the discount cards of different customers can be different. For example, the total amount and valid
); K3. Setdiscountobject (K1); K2. Setdiscountobject (K3); K2. Execute (ORDER2); Console.readkey (); } } Public classOrder {/// ///total value of goods/// Public decimalgoodstotal{Get;Set;} /// ///deduction of discount, final customer to pay amount/// Public decimalgrandtotal{Get;Set;} } Public InterfaceIorderdiscount {voidExecute (order order); } Public classOrde
In the previous article (the application of OOP design process Evolution (ii)) to improve the entire system architecture, as well as the completion of the functions of each specific function, this can only be completed a structure, to truly perfect still very far. For example, in calculating the rent of the algorithm, using a switch statement to determine the type of books to determine the book discount, before I in order to demonstrate in the switch
employee's department).In the practical application, it is helpful to some statistic functions of the report.Here's another question to add, if we use the rollup or cube keyword, then some subtotal rows will be generated, and the fields that are excluded from the grouping factor will be set to NULL, and there is a situation, such as the existence of a nullable row in the list that is grouped by. Then NULL is also represented as a grouping, so we can't judge the subtotal record by simply null. T
:
Smarter way to deliberately create this effect on the page, such as deliberately select a number of small quantities, a higher discount of hot goods, when it is sold after the display on the page, you can promote the other quantity, discount relatively small merchandise transactions.
2, the page also highlights the "limited time" and "limited" to create a sense of tension
"Limited time, lim
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