ABAP Select data from SAP table RN1MED_ME_CYDEF_EXT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN1MED_ME_CYDEF_EXT 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 RN1MED_ME_CYDEF_EXT. 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 RN1MED_ME_CYDEF_EXT 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_RN1MED_ME_CYDEF_EXT TYPE STANDARD TABLE OF RN1MED_ME_CYDEF_EXT,
      WA_RN1MED_ME_CYDEF_EXT TYPE RN1MED_ME_CYDEF_EXT,
      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: <RN1MED_ME_CYDEF_EXT> TYPE RN1MED_ME_CYDEF_EXT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN1MED_ME_CYDEF_EXT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN1MED_ME_CYDEF_EXT
  INTO TABLE IT_RN1MED_ME_CYDEF_EXT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN1MED_ME_CYDEF_EXT
*  INTO TABLE @DATA(IT_RN1MED_ME_CYDEF_EXT2).
*--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_RN1MED_ME_CYDEF_EXT INDEX 1 INTO DATA(WA_RN1MED_ME_CYDEF_EXT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN1MED_ME_CYDEF_EXT ASSIGNING <RN1MED_ME_CYDEF_EXT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN1MED_ME_CYDEF_EXT>-MANDT = 1.
<RN1MED_ME_CYDEF_EXT>-CYDEFID = 1.
<RN1MED_ME_CYDEF_EXT>-N1LFNR = 1.
<RN1MED_ME_CYDEF_EXT>-STARTDAY = 1.
<RN1MED_ME_CYDEF_EXT>-STARTDAY_X = 1.

ENDLOOP.

LOOP AT IT_RN1MED_ME_CYDEF_EXT INTO WA_RN1MED_ME_CYDEF_EXT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN1MED_ME_CYDEF_EXT-TIME, sy-vline,
  WA_RN1MED_ME_CYDEF_EXT-TIME_X, sy-vline,
  WA_RN1MED_ME_CYDEF_EXT-MENGE, sy-vline,
  WA_RN1MED_ME_CYDEF_EXT-MENGE_X, sy-vline,
  WA_RN1MED_ME_CYDEF_EXT-GEN, sy-vline,
  WA_RN1MED_ME_CYDEF_EXT-KZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN1MED_ME_CYDEF_EXT 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_RN1MED_ME_CYDEF_EXT 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_RN1MED_ME_CYDEF_EXT INTO WA_RN1MED_ME_CYDEF_EXT.


*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_RN1MED_ME_CYDEF_EXT_STR, 
MANDT TYPE STRING,
CYDEFID TYPE STRING,
N1LFNR TYPE STRING,
STARTDAY TYPE STRING,
STARTDAY_X TYPE STRING,
TIME TYPE STRING,
TIME_X TYPE STRING,
MENGE TYPE STRING,
MENGE_X TYPE STRING,
GEN TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN1MED_ME_CYDEF_EXT_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_RN1MED_ME_CYDEF_EXT_STR-MANDT sy-vline 
WA_RN1MED_ME_CYDEF_EXT_STR-CYDEFID sy-vline 
WA_RN1MED_ME_CYDEF_EXT_STR-N1LFNR sy-vline 
WA_RN1MED_ME_CYDEF_EXT_STR-STARTDAY sy-vline 
WA_RN1MED_ME_CYDEF_EXT_STR-STARTDAY_X sy-vline 
WA_RN1MED_ME_CYDEF_EXT_STR-TIME sy-vline 
WA_RN1MED_ME_CYDEF_EXT_STR-TIME_X sy-vline 
WA_RN1MED_ME_CYDEF_EXT_STR-MENGE sy-vline 
WA_RN1MED_ME_CYDEF_EXT_STR-MENGE_X sy-vline 
WA_RN1MED_ME_CYDEF_EXT_STR-GEN sy-vline 
WA_RN1MED_ME_CYDEF_EXT_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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