ABAP Select data from SAP table RDISB_INSTRUCTIONS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RDISB_INSTRUCTIONS 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 RDISB_INSTRUCTIONS. 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 RDISB_INSTRUCTIONS 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_RDISB_INSTRUCTIONS TYPE STANDARD TABLE OF RDISB_INSTRUCTIONS,
      WA_RDISB_INSTRUCTIONS TYPE RDISB_INSTRUCTIONS,
      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: <RDISB_INSTRUCTIONS> TYPE RDISB_INSTRUCTIONS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RDISB_INSTRUCTIONS
*  INTO TABLE @DATA(IT_RDISB_INSTRUCTIONS2).
*--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_RDISB_INSTRUCTIONS INDEX 1 INTO DATA(WA_RDISB_INSTRUCTIONS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RDISB_INSTRUCTIONS>-DFAELL = 1.
<RDISB_INSTRUCTIONS>-DDISPO = 1.
<RDISB_INSTRUCTIONS>-ADISBNET = 1.
<RDISB_INSTRUCTIONS>-ADISBNET_LC = 1.
<RDISB_INSTRUCTIONS>-MPARTNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RDISB_INSTRUCTIONS-MBANKDET, sy-vline,
  WA_RDISB_INSTRUCTIONS-MPAYMMETH, sy-vline,
  WA_RDISB_INSTRUCTIONS-REXCHANGER, sy-vline,
  WA_RDISB_INSTRUCTIONS-IINCL, sy-vline,
  WA_RDISB_INSTRUCTIONS-IULT, sy-vline,
  WA_RDISB_INSTRUCTIONS-MCALID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RDISB_INSTRUCTIONS 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_RDISB_INSTRUCTIONS 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_RDISB_INSTRUCTIONS INTO WA_RDISB_INSTRUCTIONS.


*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 MPARTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RDISB_INSTRUCTIONS-MPARTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDISB_INSTRUCTIONS-MPARTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field REXCHANGER
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_RDISB_INSTRUCTIONS-REXCHANGER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDISB_INSTRUCTIONS-REXCHANGER.
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_RDISB_INSTRUCTIONS_STR, 
DFAELL TYPE STRING,
DDISPO TYPE STRING,
ADISBNET TYPE STRING,
ADISBNET_LC TYPE STRING,
MPARTNR TYPE STRING,
MBANKDET TYPE STRING,
MPAYMMETH TYPE STRING,
REXCHANGER TYPE STRING,
IINCL TYPE STRING,
IULT TYPE STRING,
MCALID TYPE STRING,
FTDISB TYPE STRING,
MNDID TYPE STRING,
REMIT_INFO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RDISB_INSTRUCTIONS_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_RDISB_INSTRUCTIONS_STR-DFAELL sy-vline 
WA_RDISB_INSTRUCTIONS_STR-DDISPO sy-vline 
WA_RDISB_INSTRUCTIONS_STR-ADISBNET sy-vline 
WA_RDISB_INSTRUCTIONS_STR-ADISBNET_LC sy-vline 
WA_RDISB_INSTRUCTIONS_STR-MPARTNR sy-vline 
WA_RDISB_INSTRUCTIONS_STR-MBANKDET sy-vline 
WA_RDISB_INSTRUCTIONS_STR-MPAYMMETH sy-vline 
WA_RDISB_INSTRUCTIONS_STR-REXCHANGER sy-vline 
WA_RDISB_INSTRUCTIONS_STR-IINCL sy-vline 
WA_RDISB_INSTRUCTIONS_STR-IULT sy-vline 
WA_RDISB_INSTRUCTIONS_STR-MCALID sy-vline 
WA_RDISB_INSTRUCTIONS_STR-FTDISB sy-vline 
WA_RDISB_INSTRUCTIONS_STR-MNDID sy-vline 
WA_RDISB_INSTRUCTIONS_STR-REMIT_INFO sy-vline      INTO ld_text SEPARATED BY SPACE.

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