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The sub constructor is the instance constructor of the subclass sub that inherits from the superclass super.The sub constructor has some rules that it must follow when it is defined and implemented12. Some of the valid rules are:The method signature can be changed: This is true. The sub constructor can have a different method signature than the super constructor, which means that it can have different input parameters, output parameters, or exceptions.However, the sub constructor must still call the super constructor with appropriate actual parameters that match its interface12.The constructor of super must be called before using any components of your own instance: This is true. The sub constructor must ensure that the super constructor is called explicitly using super->constructor before accessing any instance components of its own class, such as attributes or methods.This is because the super constructor initializes the inherited components of the subclass and sets the self-reference me-> to the current instance12.You cannot do any of the following:Import parameters can only be evaluated after calling the constructor of super: This is false. The sub constructor can evaluate its own import parameters before calling the constructor of super, as long as it does not access any instance components of its own class.For example, the sub constructor can use its import parameters to calculate some values or check some conditions that are needed for calling the super constructor12.Events of your own instance cannot be raised before the registration of a handler in super: This is false. The sub constructor can raise events of its own instance before calling the constructor of super, as long as it does not access any instance components of its own class.For example, the sub constructor can raise an event to notify the consumers of the subclass about some status or error that occurred during the initialization of the subclass12.

An Access Control Object (ACO) is a CDS annotation that defines the access control rules for a CDS view entity.An ACO consists of one or more clauses that specify the role name, the data source, the access conditions, and the return code of the authority check12. Some of the clauses that are used in an ACO are:Where (to specify the access conditions): This clause is used to define the logical expression that determines whether a user has access to the data source or not. The expression can use the fields of the data source, the parameters of the CDS view entity, or the predefined variables $user and $session.The expression can also use the functions check_authorization and check_role to perform additional authority checks12.Define role (to specify the role name): This clause is used to assign a name to the role that is defined by the ACO. The role name must be unique within the namespace of the CDS view entity and must not contain any special characters.The role name can be used to reference the ACO in other annotations, such as @AccessControl.authorizationCheck or @AccessControl.grant12.Revoke (to remove access to the data source): This clause is used to explicitly deny access to the data source for a user who meets the conditions of the where clause. The revoke clause overrides any grant clause that might grant access to the same user.The revoke clause can be used to implement the principle of least privilege or to enforce data segregation12.You cannot do any of the following:Grant (to identify the data source): This is not a valid clause in an ACO. The grant clause is a separate annotation that is used to grant access to a CDS view entity or a data source for a user who has a specific role.The grant clause can reference an ACO by its role name to apply the access conditions defined by the ACO12.Return code (to assign the return code of the authority check): This is not a valid clause in an ACO. The return code of the authority check is a predefined variable that is set by the system after performing the access control check.The return code can be used in the where clause of the ACO to specify different access conditions based on the outcome of the check12.

The annotation that can be used to provide a short description of the data definition for developers that will be attached to the database view is the @EndUserText.label annotation. This annotation is used to specify a text label for the data definition that can be displayed in the development tools or in the documentation.The annotation can be inserted on line #27 in the code snippet provided in the question12. For example:The following code snippet uses the @EndUserText.label annotation to provide a short description of the data definition for the CDS view ZCDS_VIEW:@AbapCatalog.sqlViewName: 'ZCDS_VIEW' @AbapCatalog.compiler.compareFilter: true @AbapCatalog.preserveKey: true @AccessControl.authorizationCheck: #CHECK @EndUserText.label: 'CDS view for flight data' 'short description for developers define view ZCDS_VIEW as select from sflight { key carrid, key connid, key fldate, seatsmax, seatsocc }You cannot do any of the following:@UI.headerInfo.description.label: This annotation is used to specify a text label for the description field of the header information of a UI element.This annotation is not relevant for the data definition of a database [email protected]: This annotation is used to specify a text label for the title field of a badge UI element.This annotation is not relevant for the data definition of a database [email protected]: This annotation is used to specify a quick information text for the data definition that can be displayed as a tooltip in the development tools or in the documentation.This annotation is not the same as a short description or a label for the data definition12.

The statement that can be used to change the contents of a row of data in an internal table is MODIFY table. The MODIFY table statement can be used to change the contents of one or more rows of an internal table, either by specifying the table index, the table key, or a condition. The MODIFY table statement can also be used to change the contents of a database table, by specifying the table name and a work area or an internal table. The MODIFY table statement can use the TRANSPORTING addition to specify which fields should be changed, and the WHERE addition to specify which rows should be changed.The other statements are not suitable for changing the contents of a row of data in an internal table, as they have different purposes and effects. These statements are:APPEND table: This statement can be used to add a new row of data to the end of an internal table, either by specifying a work area or an inline declaration. The APPEND table statement does not change the existing rows of the internal table, but only increases the number of rows by one.INSERT table: This statement can be used to insert a new row of data into an internal table, either by specifying the table index, the table key, or a sorted position. The INSERT table statement does not change the existing rows of the internal table, but only shifts them to make room for the new row. The INSERT table statement can also be used to insert a new row of data into a database table, by specifying the table name and a work area or an inline declaration.UPDATE table: This statement can be used to update the contents of a database table, by specifying the table name and a work area or an internal table. The UPDATE table statement can use the SET addition to specify which fields should be updated, and the WHERE addition to specify which rows should be updated. The UPDATE table statement does not affect the internal table, but only the corresponding database table.

The function find_any_not_of returns the position of the first character in the string val that is not contained in the string sub. If no such character is found, the function returns 0. In this case, the string val contains only the characters A, B, and a, which are all contained in the string sub, so the function returns 0. The other functions return positive values, as follows:Count_any_of returns the number of occurrences of any character in the string sub within the string val. In this case, it returns 8, since there are 8 A's and B's in val.Count returns the number of occurrences of the string sub within the string val. In this case, it returns 2, since there are 2 AB's in val.find_any_of returns the position of the first character in the string val that is contained in the string sub. In this case, it returns 1, since the first character A is in sub.Reference:String Functions - ABAP KeywordDocumentation,Examples of String Functions - ABAP Keyword Documentation

The ABAP Cloud Development Model is the ABAP development model to build cloud-ready business apps, services, and extensions. It comes with SAP BTP and SAP S/4HANA.It works with public or private cloud, and even on-premise1.However, the complete ABAP Cloud Development Model, including the cloud-optimized ABAP language and public local SAP APIs and extension points, is available only in SAP BTP ABAP Environment and in the 2208/2022 versions of the SAP S/4HANA editions1. Therefore, you must use the ABAP Cloud Development Model in SAP BTP, ABAP environment and SAP S/4HANA Cloud, private edition. You can also use it in SAP S/4HANA on premise, but it is not mandatory.You cannot use it in SAP S/4HANA Cloud, public edition, because it does not allow custom ABAP code2.Reference:1: ABAP Cloud | SAP Blogs2: SAP S/4HANA Cloud Extensibility -- Overview and Comparison | SAP Blogs

A metadata extension is a RESTful Application Programming object that can be used to organize the display of fields in an app. A metadata extension is a CDS view that annotates another CDS view with UI annotations, such as labels, icons, or facets. These annotations define how the data should be presented in the app, such as which fields should be shown on the object page, which fields should be editable, or which fields should be used for filtering or sorting.A metadata extension can also be used to add custom actions or validations to the app12.Reference:1:Refine the Object Page with Annotations | SAP Tutorials2:ABAP RAP : Enabling custom actions with a dialog for additional input fields | SAP Blogs

When accessing the subclass instance through go_super, you can do both of the following:Access the inherited private components: A subclass inherits all the private attributes and methods of its superclass, unless they are explicitly overridden by the subclass.Therefore, you can access the inherited private components of the superclass through go_super, as long as they are not hidden by other attributes or methods in the subclass12.Access the inherited public components: A subclass inherits all the public attributes and methods of its superclass, unless they are explicitly overridden by the subclass.Therefore, you can access the inherited public components of the superclass through go_super, as long as they are not hidden by other attributes or methods in the subclass12.You cannot do any of the following:Call a subclass specific public method: A subclass does not have any public methods that are not inherited from its superclass.Therefore, you cannot call a subclass specific public method through go_super12.Call inherited public redefined methods: A subclass does not have any public methods that are redefined from its superclass.Therefore, you cannot call inherited public redefined methods through go_super12.

The ABAP Cloud Development Model requires that only public SAP APIs and extension points are used to access SAP functionality and data.These APIs and extension points are released by SAP and documented in the SAP API Business Hub1. Customer-created function modules are not part of the public SAP APIs and are not released for cloud development. Therefore, calling a function module directly from an ABAP Cloud class is not allowed and will result in a syntax error. However, there are two possible ways to call a function module indirectly from an ABAP Cloud class:Create a wrapper class or interface for the function module and release it for cloud development. A wrapper is a class or interface that encapsulates the function module and exposes its functionality through public methods or attributes. The wrapper must be created in a software component with the language version set to ''Standard ABAP'' and must be marked as released for cloud development using the annotation @EndUserText.label.The wrapper can then be called from an ABAP Cloud class using the public methods or attributes2.Use the ABAP Cloud Connector to call the function module as a remote function call (RFC) from an ABAP Cloud class. The ABAP Cloud Connector is a service that enables the secure and reliable communication between SAP BTP, ABAP environment and on-premise systems. The function module must be exposed as an RFC-enabled function module in the on-premise system and must be registered in the ABAP Cloud Connector. The ABAP Cloud class can then use the class cl_rfc_destination_service to get the destination name and the class cl_abap_system to create a proxy object for the function module.The proxy object can then be used to call the function module3.