ABAP Select data from SAP table P20_RMB_ABS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P20_RMB_ABS 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 P20_RMB_ABS. 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 P20_RMB_ABS 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_P20_RMB_ABS TYPE STANDARD TABLE OF P20_RMB_ABS,
      WA_P20_RMB_ABS TYPE P20_RMB_ABS,
      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: <P20_RMB_ABS> TYPE P20_RMB_ABS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P20_RMB_ABS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P20_RMB_ABS
  INTO TABLE IT_P20_RMB_ABS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P20_RMB_ABS
*  INTO TABLE @DATA(IT_P20_RMB_ABS2).
*--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_P20_RMB_ABS INDEX 1 INTO DATA(WA_P20_RMB_ABS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P20_RMB_ABS ASSIGNING <P20_RMB_ABS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P20_RMB_ABS>-PERNR = 1.
<P20_RMB_ABS>-FDNUM = 1.
<P20_RMB_ABS>-ABSTY = 1.
<P20_RMB_ABS>-ATEXT = 1.
<P20_RMB_ABS>-ABSGR = 1.

ENDLOOP.

LOOP AT IT_P20_RMB_ABS INTO WA_P20_RMB_ABS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P20_RMB_ABS-GRTXT, sy-vline,
  WA_P20_RMB_ABS-ABSPC, sy-vline,
  WA_P20_RMB_ABS-BEGAB, sy-vline,
  WA_P20_RMB_ABS-ENDAB, sy-vline,
  WA_P20_RMB_ABS-BEGAG, sy-vline,
  WA_P20_RMB_ABS-ENDAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P20_RMB_ABS 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_P20_RMB_ABS 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_P20_RMB_ABS INTO WA_P20_RMB_ABS.


*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.
ENDFORM. 

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

TYPES: BEGIN OF T_P20_RMB_ABS_STR, 
PERNR TYPE STRING,
FDNUM TYPE STRING,
ABSTY TYPE STRING,
ATEXT TYPE STRING,
ABSGR TYPE STRING,
GRTXT TYPE STRING,
ABSPC TYPE STRING,
BEGAB TYPE STRING,
ENDAB TYPE STRING,
BEGAG TYPE STRING,
ENDAG TYPE STRING,
BEGTR TYPE STRING,
ENDTR TYPE STRING,
BEGUL TYPE STRING,
ENDUL TYPE STRING,
PERTP TYPE STRING,
PERTX TYPE STRING,
BEGPE TYPE STRING,
ENDPE TYPE STRING,
FRING TYPE STRING,
AP01 TYPE STRING,
AP02 TYPE STRING,
AP03 TYPE STRING,
AP04 TYPE STRING,
AP05 TYPE STRING,
AP06 TYPE STRING,
AP07 TYPE STRING,
AP08 TYPE STRING,
AP09 TYPE STRING,
AP10 TYPE STRING,
AP11 TYPE STRING,
AP12 TYPE STRING,
AP13 TYPE STRING,
AP14 TYPE STRING,
AP15 TYPE STRING,
AP16 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P20_RMB_ABS_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_P20_RMB_ABS_STR-PERNR sy-vline 
WA_P20_RMB_ABS_STR-FDNUM sy-vline 
WA_P20_RMB_ABS_STR-ABSTY sy-vline 
WA_P20_RMB_ABS_STR-ATEXT sy-vline 
WA_P20_RMB_ABS_STR-ABSGR sy-vline 
WA_P20_RMB_ABS_STR-GRTXT sy-vline 
WA_P20_RMB_ABS_STR-ABSPC sy-vline 
WA_P20_RMB_ABS_STR-BEGAB sy-vline 
WA_P20_RMB_ABS_STR-ENDAB sy-vline 
WA_P20_RMB_ABS_STR-BEGAG sy-vline 
WA_P20_RMB_ABS_STR-ENDAG sy-vline 
WA_P20_RMB_ABS_STR-BEGTR sy-vline 
WA_P20_RMB_ABS_STR-ENDTR sy-vline 
WA_P20_RMB_ABS_STR-BEGUL sy-vline 
WA_P20_RMB_ABS_STR-ENDUL sy-vline 
WA_P20_RMB_ABS_STR-PERTP sy-vline 
WA_P20_RMB_ABS_STR-PERTX sy-vline 
WA_P20_RMB_ABS_STR-BEGPE sy-vline 
WA_P20_RMB_ABS_STR-ENDPE sy-vline 
WA_P20_RMB_ABS_STR-FRING sy-vline 
WA_P20_RMB_ABS_STR-AP01 sy-vline 
WA_P20_RMB_ABS_STR-AP02 sy-vline 
WA_P20_RMB_ABS_STR-AP03 sy-vline 
WA_P20_RMB_ABS_STR-AP04 sy-vline 
WA_P20_RMB_ABS_STR-AP05 sy-vline 
WA_P20_RMB_ABS_STR-AP06 sy-vline 
WA_P20_RMB_ABS_STR-AP07 sy-vline 
WA_P20_RMB_ABS_STR-AP08 sy-vline 
WA_P20_RMB_ABS_STR-AP09 sy-vline 
WA_P20_RMB_ABS_STR-AP10 sy-vline 
WA_P20_RMB_ABS_STR-AP11 sy-vline 
WA_P20_RMB_ABS_STR-AP12 sy-vline 
WA_P20_RMB_ABS_STR-AP13 sy-vline 
WA_P20_RMB_ABS_STR-AP14 sy-vline 
WA_P20_RMB_ABS_STR-AP15 sy-vline 
WA_P20_RMB_ABS_STR-AP16 sy-vline      INTO ld_text SEPARATED BY SPACE.

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