ABAP Select data from SAP table RN1ME_GRID_MDA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN1ME_GRID_MDA 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 RN1ME_GRID_MDA. 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 RN1ME_GRID_MDA 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_RN1ME_GRID_MDA TYPE STANDARD TABLE OF RN1ME_GRID_MDA,
      WA_RN1ME_GRID_MDA TYPE RN1ME_GRID_MDA,
      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: <RN1ME_GRID_MDA> TYPE RN1ME_GRID_MDA.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN1ME_GRID_MDA.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN1ME_GRID_MDA
  INTO TABLE IT_RN1ME_GRID_MDA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN1ME_GRID_MDA
*  INTO TABLE @DATA(IT_RN1ME_GRID_MDA2).
*--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_RN1ME_GRID_MDA INDEX 1 INTO DATA(WA_RN1ME_GRID_MDA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN1ME_GRID_MDA ASSIGNING <RN1ME_GRID_MDA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN1ME_GRID_MDA>-ROW_ID = 1.
<RN1ME_GRID_MDA>-DRUG = 1.
<RN1ME_GRID_MDA>-PDRUGASTR = 1.
<RN1ME_GRID_MDA>-PDRUGASTRU = 1.
<RN1ME_GRID_MDA>-RDRUGASTR = 1.

ENDLOOP.

LOOP AT IT_RN1ME_GRID_MDA INTO WA_RN1ME_GRID_MDA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN1ME_GRID_MDA-RDRUGASTRU, sy-vline,
  WA_RN1ME_GRID_MDA-RDRUGDQ, sy-vline,
  WA_RN1ME_GRID_MDA-DRUGU, sy-vline,
  WA_RN1ME_GRID_MDA-SCRAP, sy-vline,
  WA_RN1ME_GRID_MDA-SCRAPU, sy-vline,
  WA_RN1ME_GRID_MDA-FSOURCE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN1ME_GRID_MDA 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_RN1ME_GRID_MDA 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_RN1ME_GRID_MDA INTO WA_RN1ME_GRID_MDA.


*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 MEQUA, internal->external for field PDRUGASTR
CALL FUNCTION 'CONVERSION_EXIT_MEQUA_OUTPUT'
  EXPORTING
    input =                      WA_RN1ME_GRID_MDA-PDRUGASTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1ME_GRID_MDA-PDRUGASTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MEQUA, internal->external for field RDRUGASTR
CALL FUNCTION 'CONVERSION_EXIT_MEQUA_OUTPUT'
  EXPORTING
    input =                      WA_RN1ME_GRID_MDA-RDRUGASTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1ME_GRID_MDA-RDRUGASTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ME12D, internal->external for field RDRUGDQ
CALL FUNCTION 'CONVERSION_EXIT_ME12D_OUTPUT'
  EXPORTING
    input =                      WA_RN1ME_GRID_MDA-RDRUGDQ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1ME_GRID_MDA-RDRUGDQ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MEQUA, internal->external for field SCRAP
CALL FUNCTION 'CONVERSION_EXIT_MEQUA_OUTPUT'
  EXPORTING
    input =                      WA_RN1ME_GRID_MDA-SCRAP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1ME_GRID_MDA-SCRAP.
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_RN1ME_GRID_MDA_STR, 
ROW_ID TYPE STRING,
DRUG TYPE STRING,
PDRUGASTR TYPE STRING,
PDRUGASTRU TYPE STRING,
RDRUGASTR TYPE STRING,
RDRUGASTRU TYPE STRING,
RDRUGDQ TYPE STRING,
DRUGU TYPE STRING,
SCRAP TYPE STRING,
SCRAPU TYPE STRING,
FSOURCE TYPE STRING,
EDRUG_REF TYPE STRING,
DESCR TYPE STRING,
MONOGRAPH_BUT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN1ME_GRID_MDA_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_RN1ME_GRID_MDA_STR-ROW_ID sy-vline 
WA_RN1ME_GRID_MDA_STR-DRUG sy-vline 
WA_RN1ME_GRID_MDA_STR-PDRUGASTR sy-vline 
WA_RN1ME_GRID_MDA_STR-PDRUGASTRU sy-vline 
WA_RN1ME_GRID_MDA_STR-RDRUGASTR sy-vline 
WA_RN1ME_GRID_MDA_STR-RDRUGASTRU sy-vline 
WA_RN1ME_GRID_MDA_STR-RDRUGDQ sy-vline 
WA_RN1ME_GRID_MDA_STR-DRUGU sy-vline 
WA_RN1ME_GRID_MDA_STR-SCRAP sy-vline 
WA_RN1ME_GRID_MDA_STR-SCRAPU sy-vline 
WA_RN1ME_GRID_MDA_STR-FSOURCE sy-vline 
WA_RN1ME_GRID_MDA_STR-EDRUG_REF sy-vline 
WA_RN1ME_GRID_MDA_STR-DESCR sy-vline 
WA_RN1ME_GRID_MDA_STR-MONOGRAPH_BUT sy-vline      INTO ld_text SEPARATED BY SPACE.

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