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ABAPHANDLER_METH_PRECHECK - HANDLER METH PRECHECK

ABAPHANDLER_METH_PRECHECK - HANDLER METH PRECHECK

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FOR PRECHECK

Handler method definitions:

METHODS meth $[FINAL$]
   FOR PRECHECK
   $[IMPORTING$] ${ REFERENCE(im_par_pre) $| im_par_pre $}
   FOR ${ CREATE bdef $}
     $| ${ CREATE bdef\_assoc $}
     $| ${ UPDATE bdef $}
     $| ${ DELETE bdef $}
     $| ${ ACTION bdef~action
         $[REQUEST ${ REFERENCE(req_act_pre) $| req_act_pre $} $] $}
   $[CHANGING ${ $[ failed TYPE data$] $[reported TYPE data$] $}$].

Variants:

1. ... CREATE bdef ...

2. ... CREATE bdef\_assoc ...

3. ... UPDATE ...

4. ... DELETE ...

5. ... ACTION bdef~action ...



Additions

1. ... REQUEST ...

2. ... CHANGING ...

Effect

Handler method that is used for the precheck. It must be defined and implemented in a handler class of an ABAP behavior pool. The method name meth can be chosen freely. bdef is the name or the alias of the BDEF, assoc the name of the association, and action the name of the action.

See the required BDEF notations in the following topic: CDS BDL - precheck.

Variant 1

... CREATE bdef ...


Effect

Handles the precheck for create operations.

Method parameters:

  • failed and reported are implicit changing parameters that return information. See the details in section ... CHANGING....

Variant 2

... CREATE bdef\_assoc ...


Effect

Handles the precheck for create-by-association operations.

Method parameters:

  • failed and reported are implicit changing parameters that return information. See the details in section ... CHANGING....

Variant 3

... UPDATE bdef ...


Effect

Handles the precheck for update operations.

Method parameters:

  • failed and reported are implicit changing parameters that return information. See the details in section ... CHANGING....

Variant 4

... DELETE bdef ...


Effect

Handles the precheck for delete operations.

Method parameters:

  • im_par_pre: Includes the keys of the entities to be deleted. It is an internal table of type TYPE TABLE FOR DELETE bdef. The parameter can also be passed by reference (see REFERENCE).

  • failed and reported are implicit changing parameters that return information. See the details in section ... CHANGING....

Variant 5

... ACTION bdef~action ...


Effect

Handles the precheck for actions.

Method parameters:

  • failed and reported are implicit changing parameters that return information. See the details in section ... CHANGING....

Addition 1

... REQUEST ...

Effect

The addition and the parameter req_act_pre are only available in the context of actions that are specified with a parameter in the BDEF.

req_act_pre is an importing parameter and specifies Request parameter on which the information retrieval ... is based on. It is a structure of type TYPE STRUCTURE FOR ACTION REQUEST bdef.

Addition 2

... CHANGING ...

Effect

The CHANGING parameters failed and reported are implicitly available. They are used to return information on failures or messages respectively. It is possible to specify the parameters with the predefined names failed and reported explicitly following the ABAP word CHANGING. In this case, the generic type DATA is used. At runtime, the typed parameters implicitly have the BDEF derived type TYPE RESPONSE FOR.

Example

Examples for RAP handler method definitions. Find demonstrations of method implementations in the executable examples further down.

METHODS precheck_create FOR PRECHECK
    IMPORTING entities FOR CREATE bdef.

METHODS precheck_cba_assoc FOR PRECHECK
    IMPORTING entities_cba FOR CREATE bdef\_assoc.

METHODS precheck_update FOR PRECHECK
    IMPORTING entities FOR UPDATE bdef.

METHODS precheck_delete FOR PRECHECK
    IMPORTING keys FOR DELETE bdef.

METHODS precheck_action FOR PRECHECK
    IMPORTING entities FOR CREATE bdef~action.

Example for RAP Handler Methods: Demonstrates this RAP handler method for an action within a RAP handler class using a simple unmanaged RAP BO that is draft-enabled.






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