ABAP Select data from SAP table RJH_MEMORY_CALL_CENTRAL_ACCESS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RJH_MEMORY_CALL_CENTRAL_ACCESS table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to RJH_MEMORY_CALL_CENTRAL_ACCESS. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the RJH_MEMORY_CALL_CENTRAL_ACCESS table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_RJH_MEMORY_CALL_CENTRAL_ACCESS TYPE STANDARD TABLE OF RJH_MEMORY_CALL_CENTRAL_ACCESS,
      WA_RJH_MEMORY_CALL_CENTRAL_ACCESS TYPE RJH_MEMORY_CALL_CENTRAL_ACCESS,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <RJH_MEMORY_CALL_CENTRAL_ACCESS> TYPE RJH_MEMORY_CALL_CENTRAL_ACCESS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RJH_MEMORY_CALL_CENTRAL_ACCESS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RJH_MEMORY_CALL_CENTRAL_ACCESS
  INTO TABLE IT_RJH_MEMORY_CALL_CENTRAL_ACCESS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RJH_MEMORY_CALL_CENTRAL_ACCESS
*  INTO TABLE @DATA(IT_RJH_MEMORY_CALL_CENTRAL_ACCESS2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_RJH_MEMORY_CALL_CENTRAL_ACCESS INDEX 1 INTO DATA(WA_RJH_MEMORY_CALL_CENTRAL_ACCESS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RJH_MEMORY_CALL_CENTRAL_ACCESS ASSIGNING <RJH_MEMORY_CALL_CENTRAL_ACCESS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RJH_MEMORY_CALL_CENTRAL_ACCESS>-GPAG = 1.
<RJH_MEMORY_CALL_CENTRAL_ACCESS>-VKORG = 1.
<RJH_MEMORY_CALL_CENTRAL_ACCESS>-VTWEG = 1.
<RJH_MEMORY_CALL_CENTRAL_ACCESS>-SPART = 1.
<RJH_MEMORY_CALL_CENTRAL_ACCESS>-AUART = 1.

ENDLOOP.

LOOP AT IT_RJH_MEMORY_CALL_CENTRAL_ACCESS INTO WA_RJH_MEMORY_CALL_CENTRAL_ACCESS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RJH_MEMORY_CALL_CENTRAL_ACCESS-POS_ART, sy-vline,
  WA_RJH_MEMORY_CALL_CENTRAL_ACCESS-SELDAT_VON, sy-vline,
  WA_RJH_MEMORY_CALL_CENTRAL_ACCESS-SELDAT_BIS, sy-vline,
  WA_RJH_MEMORY_CALL_CENTRAL_ACCESS-XSKIPFIRSTSCREEN, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_RJH_MEMORY_CALL_CENTRAL_ACCESS you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_RJH_MEMORY_CALL_CENTRAL_ACCESS TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_RJH_MEMORY_CALL_CENTRAL_ACCESS INTO WA_RJH_MEMORY_CALL_CENTRAL_ACCESS.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field GPAG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RJH_MEMORY_CALL_CENTRAL_ACCESS-GPAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJH_MEMORY_CALL_CENTRAL_ACCESS-GPAG.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_RJH_MEMORY_CALL_CENTRAL_ACCESS_STR, 
GPAG TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
AUART TYPE STRING,
POS_ART TYPE STRING,
SELDAT_VON TYPE STRING,
SELDAT_BIS TYPE STRING,
XSKIPFIRSTSCREEN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RJH_MEMORY_CALL_CENTRAL_ACCESS_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_RJH_MEMORY_CALL_CENTRAL_ACCESS_STR-GPAG sy-vline 
WA_RJH_MEMORY_CALL_CENTRAL_ACCESS_STR-VKORG sy-vline 
WA_RJH_MEMORY_CALL_CENTRAL_ACCESS_STR-VTWEG sy-vline 
WA_RJH_MEMORY_CALL_CENTRAL_ACCESS_STR-SPART sy-vline 
WA_RJH_MEMORY_CALL_CENTRAL_ACCESS_STR-AUART sy-vline 
WA_RJH_MEMORY_CALL_CENTRAL_ACCESS_STR-POS_ART sy-vline 
WA_RJH_MEMORY_CALL_CENTRAL_ACCESS_STR-SELDAT_VON sy-vline 
WA_RJH_MEMORY_CALL_CENTRAL_ACCESS_STR-SELDAT_BIS sy-vline 
WA_RJH_MEMORY_CALL_CENTRAL_ACCESS_STR-XSKIPFIRSTSCREEN sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.