ABAP Select data from SAP table /SAPAPO/RRP_IOLIST_PARAMS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SAPAPO/RRP_IOLIST_PARAMS 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 /SAPAPO/RRP_IOLIST_PARAMS. 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 /SAPAPO/RRP_IOLIST_PARAMS 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_/SAPAPO/RRP_IOLIST_PARAMS TYPE STANDARD TABLE OF /SAPAPO/RRP_IOLIST_PARAMS,
      WA_/SAPAPO/RRP_IOLIST_PARAMS TYPE /SAPAPO/RRP_IOLIST_PARAMS,
      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: </SAPAPO/RRP_IOLIST_PARAMS> TYPE /SAPAPO/RRP_IOLIST_PARAMS.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SAPAPO/RRP_IOLIST_PARAMS
  INTO TABLE IT_/SAPAPO/RRP_IOLIST_PARAMS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/RRP_IOLIST_PARAMS
*  INTO TABLE @DATA(IT_/SAPAPO/RRP_IOLIST_PARAMS2).
*--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_/SAPAPO/RRP_IOLIST_PARAMS INDEX 1 INTO DATA(WA_/SAPAPO/RRP_IOLIST_PARAMS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SAPAPO/RRP_IOLIST_PARAMS ASSIGNING </SAPAPO/RRP_IOLIST_PARAMS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/RRP_IOLIST_PARAMS>-PRREG = 1.
</SAPAPO/RRP_IOLIST_PARAMS>-OQTYFLG = 1.
</SAPAPO/RRP_IOLIST_PARAMS>-RDFAC = 1.
</SAPAPO/RRP_IOLIST_PARAMS>-MARKED_ORDERS = 1.
</SAPAPO/RRP_IOLIST_PARAMS>-INTENS_ORDER = 1.

ENDLOOP.

LOOP AT IT_/SAPAPO/RRP_IOLIST_PARAMS INTO WA_/SAPAPO/RRP_IOLIST_PARAMS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/RRP_IOLIST_PARAMS-ORDERID, sy-vline,
  WA_/SAPAPO/RRP_IOLIST_PARAMS-POSITION_NO, sy-vline,
  WA_/SAPAPO/RRP_IOLIST_PARAMS-LINE_NO, sy-vline,
  WA_/SAPAPO/RRP_IOLIST_PARAMS-CATEGORY_TYPE, sy-vline,
  WA_/SAPAPO/RRP_IOLIST_PARAMS-SUBLOC, sy-vline,
  WA_/SAPAPO/RRP_IOLIST_PARAMS-VERSION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/RRP_IOLIST_PARAMS 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_/SAPAPO/RRP_IOLIST_PARAMS 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_/SAPAPO/RRP_IOLIST_PARAMS INTO WA_/SAPAPO/RRP_IOLIST_PARAMS.


*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 CUNIT, internal->external for field MEOUT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/RRP_IOLIST_PARAMS-MEOUT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/RRP_IOLIST_PARAMS-MEOUT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/RRP_IOLIST_PARAMS-MEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/RRP_IOLIST_PARAMS-MEIN.
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_/SAPAPO/RRP_IOLIST_PARAMS_STR, 
PRREG TYPE STRING,
OQTYFLG TYPE STRING,
RDFAC TYPE STRING,
MARKED_ORDERS TYPE STRING,
INTENS_ORDER TYPE STRING,
ORDERID TYPE STRING,
POSITION_NO TYPE STRING,
LINE_NO TYPE STRING,
CATEGORY_TYPE TYPE STRING,
SUBLOC TYPE STRING,
VERSION TYPE STRING,
HAS_CHARACTS TYPE STRING,
CHARID TYPE STRING,
ACTIVE TYPE STRING,
MARKED TYPE STRING,
CHANGE TYPE STRING,
IS_INPUT_NODE TYPE STRING,
CALLER TYPE STRING,
TRGUID TYPE STRING,
MEOUT TYPE STRING,
MEIN TYPE STRING,
PEG_OVERVIEW_TAB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/RRP_IOLIST_PARAMS_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_/SAPAPO/RRP_IOLIST_PARAMS_STR-PRREG sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-OQTYFLG sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-RDFAC sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-MARKED_ORDERS sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-INTENS_ORDER sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-ORDERID sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-POSITION_NO sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-LINE_NO sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-CATEGORY_TYPE sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-SUBLOC sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-VERSION sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-HAS_CHARACTS sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-CHARID sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-ACTIVE sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-MARKED sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-CHANGE sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-IS_INPUT_NODE sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-CALLER sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-TRGUID sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-MEOUT sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-MEIN sy-vline 
WA_/SAPAPO/RRP_IOLIST_PARAMS_STR-PEG_OVERVIEW_TAB sy-vline      INTO ld_text SEPARATED BY SPACE.

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