ABAP HR DOUBTS

Hi ,
I have some doubts in ABAP-HR.Please clarify my doubts.
1) Provide and end provide statements are obsolate.Shall we use select in place of provide and provide?.
2) what are the important macros in ABAP HR?
3)Do we have to use logical data base if we are using macros?.
Moderator message: please do not ask interview-type questions, search for available information.
Edited by: Thomas Zloch on Jan 6, 2011 10:57 AM

Hi Shakir,
First of all you have to assign logical database name say PNP in the attributes of the program. After assigning the logical data base, you can see teh button below with HR REPORT CATEGORY. Click on that and select Master dat(infotypes) radio button. After that go for f4 help to see the existed HR report categories. From that you select one which contains the fields you want. If you are not able to find Hr report category with the fields you want then you need to create your own report category with the fields you want.
If you want to select only active employees
RP-PROVIDE-FROM-LAST p0000 space pn-begda pn-endda.
CHECK P0000-STAT2 = '3'.
note: '3' or some other value based on the values stored in infotype 0000 for the employment status.
if employee is not active then it will skip that employee and selects the next employee.

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Hi ABAP Gurus,
Please help me in solving following ABAP SQL doubt.
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Thanks,
SAM
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Hi all,
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Hi sarath,
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amit m.

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Hello,
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Hi Experts.
Plz give me some details for the following questions.
1. what is abstract class.
2. give me some example program using inheritance.
3. Some sample programs using events.
4. Narrow casting & wide casting.. And describe the use of it.
5. How to declare internal table in ABAP OOPS.
6. What is the use of table type.?
7. What is instance.?
8. Explain friend class.
Thank in advance.
Points will be given for the answers.
regards,
J.Joe

HI
1. what is abstract class.
Abstract classes are normally used as an incomplete blueprint for concrete (that is, non-abstract) subclasses, for example to define a uniform interface.
Classes with at least one abstract method are themselves abstract.
Static methods and constructors cannot be abstract.
You can specify the class of the instance to be created explicitly: CREATE OBJECT <RefToAbstractClass> TYPE <NonAbstractSubclassName>.
Abstarct classes themselves cant be instantiated ( althrough their subclasses can)
Reference to abstract classes can refer to instance of subclass
Abstract (instance) methods are difined in the class , but not implemented
They must be redefined in subclasses
CLASS LC1 DEFINAITION ABSTARCT
PUBLIC SECTION
METHODS ESTIMATE ABSTARCT IMPORTING
ENDCLASS.
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REPORT demo_inheritance.
CLASS counter DEFINITION.
PUBLIC SECTION.
 METHODS: set IMPORTING value(set_value) TYPE i,
 increment,
 get EXPORTING value(get_value) TYPE i.
 PROTECTED SECTION .
 DATA count TYPE i.
ENDCLASS.
CLASS counter IMPLEMENTATION.
METHOD set.
 count = set_value.
ENDMETHOD.
METHOD increment.
 ADD 1 TO count.
ENDMETHOD.
METHOD get.
 get_value = count.
ENDMETHOD.
ENDCLASS.
CLASS counter_ten DEFINITION INHERITING FROM counter.
PUBLIC SECTION.
 METHODS increment REDEFINITION .
 DATA count_ten.
ENDCLASS.
CLASS counter_ten IMPLEMENTATION.
METHOD increment.
 DATA modulo TYPE I.
 CALL METHOD super->increment .
 write / count.
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 IF modulo = 0.
 count_ten = count_ten + 1.
 write count_ten.
 ENDIF.
ENDMETHOD.
ENDCLASS.
DATA: count TYPE REF TO counter,
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DO 20 TIMES.
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ENDDO.
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3. Some sample programs using events.
Events in ABAP Objects - Example
The following example shows how to declare, call, and handle events in ABAP Objects.
Overview
This object works with the interactive list displayed below. Each user interaction triggers an event in ABAP Objects. The list and its data is created in the class C_LIST. There is a class STATUS for processing user actions. It triggers an event BUTTON_CLICKED in the AT USER-COMMAND event. The event is handled in the class C_LIST. It contains an object of the class C_SHIP or C_TRUCK for each line of the list. Both of these classes implement the interface I_VEHICLE. Whenever the speed of one of these objects changes, the event SPEED_CHANGE is triggered. The class C_LIST reacts to this and updates the list.
Constraints
The ABAP statements used for list processing are not yet fully available in ABAP Objects. However, to produce a simple test output, you can use the following statements:
WRITE [AT] /<offset>(<length>) <f>
ULINE
SKIP
NEW-LINE
Note: The behavior of formatting and interactive list functions in their current state are not guaranteed. Incompatible changes could occur in a future release.
Declarations
This example is implemented using local interfaces and classes. Below are the declarations of the interfaces and classes:
Interface and Class declarations
INTERFACE I_VEHICLE.
DATA MAX_SPEED TYPE I.
EVENTS SPEED_CHANGE EXPORTING VALUE(NEW_SPEED) TYPE I.
METHODS: DRIVE,
 STOP.
ENDINTERFACE.
CLASS C_SHIP DEFINITION.
PUBLIC SECTION.
METHODS CONSTRUCTOR.
INTERFACES I_VEHICLE.
PRIVATE SECTION.
ALIASES MAX FOR I_VEHICLE~MAX_SPEED.
DATA SHIP_SPEED TYPE I.
ENDCLASS.
CLASS C_TRUCK DEFINITION.
PUBLIC SECTION.
METHODS CONSTRUCTOR.
INTERFACES I_VEHICLE.
PRIVATE SECTION.
ALIASES MAX FOR I_VEHICLE~MAX_SPEED.
DATA TRUCK_SPEED TYPE I.
ENDCLASS.
CLASS STATUS DEFINITION.
PUBLIC SECTION.
 CLASS-EVENTS BUTTON_CLICKED EXPORTING VALUE(FCODE) LIKE SY-UCOMM.
CLASS-METHODS: CLASS_CONSTRUCTOR,
 USER_ACTION.
ENDCLASS.
CLASS C_LIST DEFINITION.
PUBLIC SECTION.
METHODS: FCODE_HANDLER FOR EVENT BUTTON_CLICKED OF STATUS
 IMPORTING FCODE,
 LIST_CHANGE FOR EVENT SPEED_CHANGE OF I_VEHICLE
 IMPORTING NEW_SPEED,
 LIST_OUTPUT.
PRIVATE SECTION.
DATA: ID TYPE I,
 REF_SHIP TYPE REF TO C_SHIP,
 REF_TRUCK TYPE REF TO C_TRUCK,
 BEGIN OF LINE,
 ID TYPE I,
 FLAG,
 IREF TYPE REF TO I_VEHICLE,
 SPEED TYPE I,
 END OF LINE,
 LIST LIKE SORTED TABLE OF LINE WITH UNIQUE KEY ID.
ENDCLASS.
The following events are declared in the example:
The instance event SPEED_CHANGE in the interface I_VEHICLE
The static event BUTTON_CLICKED in the class STATUS.
The class C_LIST contains event handler methods for both events.
Note that the class STATUS does not have any attributes, and therefore only works with static methods and events.
Implementations
Below are the implementations of the methods of the above classes:
Implementations
CLASS C_SHIP IMPLEMENTATION.
METHOD CONSTRUCTOR.
 MAX = 30.
ENDMETHOD.
METHOD I_VEHICLE~DRIVE.
 CHECK SHIP_SPEED < MAX.
 SHIP_SPEED = SHIP_SPEED + 10.
 RAISE EVENT I_VEHICLE~SPEED_CHANGE
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ENDMETHOD.
METHOD I_VEHICLE~STOP.
 CHECK SHIP_SPEED > 0.
 SHIP_SPEED = 0.
 RAISE EVENT I_VEHICLE~SPEED_CHANGE
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ENDMETHOD.
ENDCLASS.
CLASS C_TRUCK IMPLEMENTATION.
METHOD CONSTRUCTOR.
 MAX = 150.
ENDMETHOD.
METHOD I_VEHICLE~DRIVE.
 CHECK TRUCK_SPEED < MAX.
 TRUCK_SPEED = TRUCK_SPEED + 50.
 RAISE EVENT I_VEHICLE~SPEED_CHANGE
 EXPORTING NEW_SPEED = TRUCK_SPEED.
ENDMETHOD.
METHOD I_VEHICLE~STOP.
 CHECK TRUCK_SPEED > 0.
 TRUCK_SPEED = 0.
 RAISE EVENT I_VEHICLE~SPEED_CHANGE
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ENDMETHOD.
ENDCLASS.
CLASS STATUS IMPLEMENTATION.
METHOD CLASS_CONSTRUCTOR.
 SET PF-STATUS 'VEHICLE'.
 WRITE 'Click a button!'.
ENDMETHOD.
METHOD USER_ACTION.
 RAISE EVENT BUTTON_CLICKED EXPORTING FCODE = SY-UCOMM.
ENDMETHOD.
ENDCLASS.
CLASS C_LIST IMPLEMENTATION.
METHOD FCODE_HANDLER .
 CLEAR LINE.
 CASE FCODE.
 WHEN 'CREA_SHIP'.
 ID = ID + 1.
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 ID = ID + 1.
 CREATE OBJECT REF_TRUCK.
 LINE-ID = ID.
 LINE-FLAG = 'T'.
 LINE-IREF = REF_TRUCK.
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 WHEN 'DRIVE'.
 CHECK SY-LILLI > 0.
 READ TABLE LIST INDEX SY-LILLI INTO LINE.
 CALL METHOD LINE-IREF->DRIVE.
 WHEN 'STOP'.
 LOOP AT LIST INTO LINE.
 CALL METHOD LINE-IREF->STOP.
 ENDLOOP.
 WHEN 'CANCEL'.
 LEAVE PROGRAM.
 ENDCASE.
 CALL METHOD LIST_OUTPUT.
ENDMETHOD.
METHOD LIST_CHANGE .
 LINE-SPEED = NEW_SPEED.
 MODIFY TABLE LIST FROM LINE.
ENDMETHOD.
METHOD LIST_OUTPUT.
 SY-LSIND = 0.
 SET TITLEBAR 'TIT'.
 LOOP AT LIST INTO LINE.
 IF LINE-FLAG = 'C'.
 WRITE / ICON_WS_SHIP AS ICON.
 ELSEIF LINE-FLAG = 'T'.
 WRITE / ICON_WS_TRUCK AS ICON.
 ENDIF.
 WRITE: 'Speed = ', LINE-SPEED.
 ENDLOOP.
ENDMETHOD.
ENDCLASS.
The static method USER_ACTION of the class STATUS triggers the static event BUTTON_CLICKED. The instance methods I_VEHICLEDRIVE and I_VEHICLESTOP trigger the instance event I_VEHICLE~SPEED_CHANGE in the classes C_SHIP and C_TRUCK.
Using the Classes in a Program
The following program uses the above classes:
REPORT OO_EVENTS_DEMO NO STANDARD PAGE HEADING.
Global data of program
DATA LIST TYPE REF TO C_LIST.
Program events
START-OF-SELECTION.
CREATE OBJECT LIST.
SET HANDLER: LIST->FCODE_HANDLER,
 LIST->LIST_CHANGE FOR ALL INSTANCES.
AT USER-COMMAND.
CALL METHOD STATUS=>USER_ACTION.
The program creates an object of the class C_LIST and registers the event handler method FCODE_HANDLER of the object for the class event BUTTON_CLICKED, and the event handler method LIST_CHANGE for the event SPEED_CHANGE of all instances that implement the interface I_VEHICLE.
4. Narrow casting & wide casting.. And describe the use of it.
Narrowing Cast
The assignment of a subclass instance to a reference variable of the type "reference to superclass" is described as a narrowing cast, because you are switching from a more detailed view to a one with less detail.
Description up-cast is also used.
use
A user who is not interested in the finer points of cars, trucks, and busses (but only, for example, in the fuel consumption and tank gauge) does not need to know about them. This user only wants and needs to work with (references to) the lcl_vehicle class. However, in order to allow the user to work with cars, busses, or trucks, you generally need a narrowing cast.
Widening cast
The widening cast logically represents the opposite of the narrowing cast. The widening cast cannot be checked statically, only at runtime. The Cast Operator ?= (or the equivalent MOVE ... ?TO ) must be used to make this visible.
It changes from a less detailed view to one with more detail.
use
The client, the car rental company wants to execute a function for specific vehicles form the list (vehicle_list). For example, the client wants to ascertain the truck with the largest cargo capacity. However, not all vehicles are in the trucks list, it also includes references to cars and busses.
5. How to declare internal table in ABAP OOPS.
BEGIN OF LINE,
 ID TYPE I,
 FLAG,
 IREF TYPE REF TO I_VEHICLE,
 SPEED TYPE I,
 END OF LINE,
6. What is the use of table type.?
Please check the SAP help , as all these things are provided in detail in it .
In case you find it difficult to find it or search for it here is the link
http://help.sap.com/saphelp_nw04/helpdata/en/90/8d7304b1af11d194f600a0c929b3c3/frameset.htm
7. What is instance.?
Instance methods are called using CALL METHOD <reference>-><instance_method>.
Static methods (also referred to as class methods) are called using CALL METHOD <classname>=><class_method>.
If you are calling a static method from within the class, you can omit the class name.
You access instance attributes using <instance>-><instance_attribute>
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In rare cases, classes have to work together so closely that they need access to their protected and private components. To avoid making these components available to all users, there is the concept of friendship between classes.
To do this you use the FRIENDS additions to the CLASS statement, in which all classes and interfaces that are to be provided friendship are listed
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Classes that inherit from friends and interfaces that contain a friend as a component interface also become friends. However, providing friendship, unlike the attribute of being a friend, is not inherited. A friend of a superclass is therefore not automatically a friend of its subclasses.
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Erwan
Message was edited by:
Erwan LE BRUN

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