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In SAP S/4HANA product development, SAP CDS (Core Data Services) View is a key technology and plays an important role. CDS View allows developers to define highly optimized database views for data modeling, query and analysis. It provides developers with a powerful and flexible tool to easily build complex data models and business logic while improving query performance and data processing efficiency. This article will introduce in detail the important role of SAP CDS View in SAP S/4HANA product development, and illustrate it with specific examples.
1. The important role of SAP CDS View
1. Data Modeling and Definition
SAP CDS View allows developers to define data models in ABAP Dictionary, representing data entities and the relationships between them as logical views. Through CDS View, complex business entities can be abstracted and modeled, making the data model clearer and easier to maintain.
2. Encapsulation of business logic
CDS View can not only define the data model, but also encapsulate business logic in the model. Developers can use SQL language and ABAP language to write logic to realize data calculation, processing and conversion. In this way, CDS View becomes a comprehensive object containing data and business logic, which is convenient for developers to query and process data.
3. Data query and report development
CDS View provides a wealth of query functions to meet data requirements at different levels and angles. Developers can perform data query and report development through simple SQL query or use SAP query tools (such as ABAP CDS Query and SAP Analytics Cloud). This provides users with powerful data analysis and report display capabilities.
4. Data security and authority control
In SAP S/4HANA, data security is an important consideration. CDS View allows developers to define data access permissions and data filtering conditions in the data model, ensuring that users can only access the data they are authorized to view. This kind of data security control is carried out at the database level, which can effectively protect sensitive data.
5. Performance optimization
CDS View is a view defined at the database level. It uses the optimization technology of SAP HANA database, which can connect multiple logical tables into an optimized query to improve query performance and data processing efficiency. Through CDS View, frequent data reading and data conversion can be avoided, the burden on the database can be reduced, and the performance of the system can be improved.
6. Data caching and preloading
CDS View of SAP S/4HANA supports data caching and preloading functions. When data is frequently accessed, it can be cached in memory to improve subsequent data access speed. The preload function can preload data when the system starts, reducing the waiting time for users to query.
2. Specific application examples of SAP CDS View
In order to better understand the important role of SAP CDS View in SAP S/4HANA product development, we use a specific example to illustrate. Suppose we have a simple purchase order data model, including order header information and order line item information. We hope to define a query view through CDS View to display the basic information of the purchase order and the total order amount.
1. Define the data model
First, we need to define the data model in ABAP Dictionary. Create a CDS View to add the order header information and order line item information to the model as two logical tables. At the same time, we defined the calculation field "TotalAmount" in CDS View to calculate the total amount of the order.
@AbapCatalog.sqlViewName: 'ZPURCHASEORDER_VIEW'
@AbapCatalog.compiler.compareFilter: true
@AccessControl.authorizationCheck: #CHECK
define view ZPurchaseOrderView as select from ekko as header
inner join ekpo as item on header.ebeln = item
.ebeln
{
key header.ebeln as OrderNumber,
header.bukrs as CompanyCode,
item.matnr as MaterialNumber,
item.menge as Quantity,
item.netpr as Price,
item.menge * item.netpr as TotalAmount
}
2. Data query
With the definition of CDS View, we can now obtain the purchase order data and the total order amount through a simple SQL query. For example, we can use the following SQL query to get all purchase order information and total order amount for company code '1000':
SELECT * FROM ZPurchaseOrderView WHERE CompanyCode = '1000';
3. Data report
In addition to SQL queries, we can also use CDS View in SAP Analytics Cloud to create data reports and charts. In SAP Analytics Cloud, we can easily select CDS View as the data source, and display the purchase order data and total order amount through visual charts.
4. Data Security
If we want to allow only specific users or user groups to access the data of purchase orders, we can define data filter conditions in CDS View. For example, we can add a filter condition to the purchase order data to only allow users with company code '1000' to access.
@EndUserText.label: 'Purchase Orders for Company Code 1000'
@ObjectModel.representativeKey: 'OrderNumber'
@AccessControl.authorizationCheck: #CHECK
define view ZPurchaseOrderView as select from ekko as header
inner join ekpo as item on header.ebeln = item.ebeln
{
key header.ebeln as OrderNumber,
header.bukrs as CompanyCode,
item.matnr as MaterialNumber,
item.menge as Quantity,
item.netpr as Price,
item.menge * item.netpr as TotalAmount
}
where header.bukrs = '1000';
By defining data filtering conditions in CDS View, we can ensure that only specific users or user groups can access specific data, thereby ensuring data security.
3. Summary
SAP CDS View plays an important role in SAP S/4HANA product development. It not only provides developers with flexible data modeling and business logic encapsulation capabilities, but also supports rich data query and report development functions. Through CDS View, developers can optimize data processing at the database level and improve system performance. At the same time, CDS View also supports data security and authority control to ensure that users can only access authorized data.
Through specific examples, we can better understand the important role of SAP CDS View in SAP S/4HANA product development. It provides a powerful and flexible tool for SAP developers to build complex data models and business logic, and to achieve efficient data query and data processing. As part of the technical creation circle of SAP, CDS View plays a vital role in the successful application of SAP S/4HANA.