ABAP Select data from SAP table RMMBI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMMBI
*  INTO TABLE @DATA(IT_RMMBI2).
*--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_RMMBI INDEX 1 INTO DATA(WA_RMMBI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMMBI>-ERTAG = 1.
<RMMBI>-GSVBR = 1.
<RMMBI>-MGVBR = 1.
<RMMBI>-ANTEG = 1.
<RMMBI>-UNVBR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMMBI-MUVBR, sy-vline,
  WA_RMMBI-ANTEU, sy-vline,
  WA_RMMBI-KZPRF, sy-vline,
  WA_RMMBI-KZMAP, sy-vline,
  WA_RMMBI-TRANC, sy-vline,
  WA_RMMBI-ZMMH1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMMBI 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_RMMBI 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_RMMBI INTO WA_RMMBI.


*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_RMMBI_STR, 
ERTAG TYPE STRING,
GSVBR TYPE STRING,
MGVBR TYPE STRING,
ANTEG TYPE STRING,
UNVBR TYPE STRING,
MUVBR TYPE STRING,
ANTEU TYPE STRING,
KZPRF TYPE STRING,
KZMAP TYPE STRING,
TRANC TYPE STRING,
ZMMH1 TYPE STRING,
MAXLI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMMBI_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_RMMBI_STR-ERTAG sy-vline 
WA_RMMBI_STR-GSVBR sy-vline 
WA_RMMBI_STR-MGVBR sy-vline 
WA_RMMBI_STR-ANTEG sy-vline 
WA_RMMBI_STR-UNVBR sy-vline 
WA_RMMBI_STR-MUVBR sy-vline 
WA_RMMBI_STR-ANTEU sy-vline 
WA_RMMBI_STR-KZPRF sy-vline 
WA_RMMBI_STR-KZMAP sy-vline 
WA_RMMBI_STR-TRANC sy-vline 
WA_RMMBI_STR-ZMMH1 sy-vline 
WA_RMMBI_STR-MAXLI sy-vline      INTO ld_text SEPARATED BY SPACE.

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