Three layers of interaction
In the previous article, our entire system has learned about the physical profile of PETSHOP's three-layer deployment structure. It does not explain how to divide from the point of view of the application, and it is not clear that the data display layer, intermediate layer, data How is the layer interacts. In order to better illustrate this three-story structure and the specific details of each layer, you also have a Walkthrough for the entire application. Here I will showcase from the perspective of the system (see Figure 1), customers are shopping During the process, the three layers of the system work and how interact. This thing is a bit like the example of the instance of UML, which is more helpful to demand and analysis.
From this scenario, we can clearly understand the operation of the Internet Customer during shopping. First, enter the customer's purchase of goods and quantity by the user interactive interface Cart.aspx page, then these shopping lists are made by the background application (Cart.aspx.cs) (such as security verification, check, Format of data, etc.), then call the middleware (some .NET Assembly in the program structure), encapsulate the business logic of the shopping, and finally update the data in the database (data layer).
DataBase
.NET PETSHOP database is not very large, with a total of 12 user tables and 23 stored procedures. The PETSHOP database is stored in user data, account data, product data, user configuration data, order data, inventory data, and supplier data. The data of the application accesses the database is not directly dealing with the database table, but the required data is obtained by the operation of the stored procedure. Such a design has a benefit to avoid frequent table operations, and the storage procedure running on the server can greatly improve the operation efficiency and improve the speed of access data, and also shield the logic of the database table, making Database access becomes a service access available to the database. Of course, some people have accused that these stored procedure migration is doubtful.
Below I will list the basic tables of these databases through the form (see Table 1), and do it one by one, I hope to help everyone in depth.
Table name
Remark information
Account
Basic user information.
Bannerdata
Store setting information for the Banner image of the system interface.
Category
Pet category catalog table (such as fish, dogs, etc.).
Inventory
Pet product inventory information.
Item
Details of a single product.
LineItem
Details of each item of the order, including product name and quantity, price, etc.
ORDERS
User shopping orders, one order can include multiple LineItem
ORDERSTATUS
Order status
PRODUCT
Pet Product List, a product may include multiple items
Profile
User configuration table for recording their Favorites.
Signon
User account login table, because of common use, since it is independent from Account.
Supplier
Supplier information.
Through the table below, we know some of the information of the PETSHOP database, but what is the relationship between these tables? People who care about database modeling and design may be more interested in this issue. Here, I will give the chart (Figure 2) to illustrate the relationship between these database tables.
Tip: In fact, it is not a difficult thing to get the above database model graphics for people engaged in database modeling and design. As we mentioned earlier, we can use Visio to do engineering to get the above beautiful design model map. At the same time, we can also modify the design in the model map, you can apply it immediately to your physical database to keep it synchronized. After finishing the basic database table, let's take a look at the stored procedure. With Microsoft, only the design is called the stored procedure, it is "Clearative Department of code from the middle-tier", I personally feel that this is good. Similarly, I will listed it in a form (Table 2).
Store process name
Remark information
UpaccountAdd
Add an account.
UpaccountGetDress
Get the user's address, mainly used for the registration address and the delivery address when the order is under orders.
UpaccountGetDetails
Get detailed information on your account.
Upaccountlogin
User login verification.
UpaccountUpdate
Update the user account.
UpcategorygetList
Get a list of products for a category.
UpinventoryAdd
Add the specified item to survival information.
UpinventorygetList
Get inventory list.
Upitemadd
Add a product.
Upitemgetdetails
Get detailed information for the specified product item.
Upitemgetlist
Get the list of specific items for a particular class product.
Upitemgetlist_listbypage
Function is with the same, but the data is acquired.
UpordersAdd
Add an order.
Upordersget
Get information about a certain order.
Upordersgetdetails
Get detailed information for a certain order.
Uporderstatusget
Get the status of the order.
UpproductAdd
Add a class of other products.
UpproductgetList
Returns a list of a type of product.
UpproductGetList_ListbyPage
With the same, the result data is obtained. .
UPPRODUCTSEARCH
product search.
UpproductSearch_listbypage
With the same, how to get the result data.
UPPROFILEGETBANNNEROPTION
Banner's configuration information.
UPPROFILEGETLISTLOption
Get user configuration information.
Table 2: list of PETSHOP stored procedures
In these stored processes, the characteristics of the OpenXML of SQL Server2000 are used instead of traditional row assemblies, and the system's burden can be reduced using very frequent data access operations.
Ok, PETSHOP's DataTiar said here, in the later article I will explain the execution of the stored procedure again on the instance of a data access. Next, I will introduce the intermediate layer.
