ABAP Select data from SAP table /IWFND/S_MED_MDL_RW_MDL_HEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /IWFND/S_MED_MDL_RW_MDL_HEADER
*  INTO TABLE @DATA(IT_/IWFND/S_MED_MDL_RW_MDL_HEADER2).
*--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_/IWFND/S_MED_MDL_RW_MDL_HEADER INDEX 1 INTO DATA(WA_/IWFND/S_MED_MDL_RW_MDL_HEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</IWFND/S_MED_MDL_RW_MDL_HEADER>-MODEL_IDENTIFIER = 1.
</IWFND/S_MED_MDL_RW_MDL_HEADER>-GSDO_TYPE = 1.
</IWFND/S_MED_MDL_RW_MDL_HEADER>-VERSION = 1.
</IWFND/S_MED_MDL_RW_MDL_HEADER>-MODEL_TYPE = 1.
</IWFND/S_MED_MDL_RW_MDL_HEADER>-CREATED_BY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/IWFND/S_MED_MDL_RW_MDL_HEADER-CHANGED_BY, sy-vline,
  WA_/IWFND/S_MED_MDL_RW_MDL_HEADER-CREATED_TIMESTMP, sy-vline,
  WA_/IWFND/S_MED_MDL_RW_MDL_HEADER-CHANGED_TIMESTMP, sy-vline,
  WA_/IWFND/S_MED_MDL_RW_MDL_HEADER-EXT_MODEL_TNAME, sy-vline,
  WA_/IWFND/S_MED_MDL_RW_MDL_HEADER-SCHEMA_NAMESPACE, sy-vline,
  WA_/IWFND/S_MED_MDL_RW_MDL_HEADER-SERVICE_SCHEMA_MINORVERSION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/IWFND/S_MED_MDL_RW_MDL_HEADER 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_/IWFND/S_MED_MDL_RW_MDL_HEADER 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_/IWFND/S_MED_MDL_RW_MDL_HEADER INTO WA_/IWFND/S_MED_MDL_RW_MDL_HEADER.


*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_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR, 
MODEL_IDENTIFIER TYPE STRING,
GSDO_TYPE TYPE STRING,
VERSION TYPE STRING,
MODEL_TYPE TYPE STRING,
CREATED_BY TYPE STRING,
CHANGED_BY TYPE STRING,
CREATED_TIMESTMP TYPE STRING,
CHANGED_TIMESTMP TYPE STRING,
EXT_MODEL_TNAME TYPE STRING,
SCHEMA_NAMESPACE TYPE STRING,
SERVICE_SCHEMA_MINORVERSION TYPE STRING,
SERVICE_SCHEMA_PATCHVERSION TYPE STRING,
SERVICE_SCHEMA_VERSION TYPE STRING,
USE_BATCH TYPE STRING,
SOFT_STATE_ENABLED TYPE STRING,
SOFT_STATE_MODE TYPE STRING,
EXTENDING_SERVICE TYPE STRING,
TECHNICAL_NAME TYPE STRING,
VERSION TYPE STRING,
APPL_COMP_ID TYPE STRING,
IS_RAL_RELEVANT TYPE STRING,
RELEASE_STATUS TYPE STRING,
MODEL_FEATURES TYPE STRING,
DOES_SUPPORT_MESSAGE_SCOPE TYPE STRING,
SET_INITIAL_FOR_NULL_IN_FILTER TYPE STRING,
USE_DEFERRED_BATCH_RESP_CREA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_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_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-MODEL_IDENTIFIER sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-GSDO_TYPE sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-VERSION sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-MODEL_TYPE sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-CREATED_BY sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-CHANGED_BY sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-CREATED_TIMESTMP sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-CHANGED_TIMESTMP sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-EXT_MODEL_TNAME sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-SCHEMA_NAMESPACE sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-SERVICE_SCHEMA_MINORVERSION sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-SERVICE_SCHEMA_PATCHVERSION sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-SERVICE_SCHEMA_VERSION sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-USE_BATCH sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-SOFT_STATE_ENABLED sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-SOFT_STATE_MODE sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-EXTENDING_SERVICE sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-TECHNICAL_NAME sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-VERSION sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-APPL_COMP_ID sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-IS_RAL_RELEVANT sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-RELEASE_STATUS sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-MODEL_FEATURES sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-DOES_SUPPORT_MESSAGE_SCOPE sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-SET_INITIAL_FOR_NULL_IN_FILTER sy-vline 
WA_/IWFND/S_MED_MDL_RW_MDL_HEADER_STR-USE_DEFERRED_BATCH_RESP_CREA sy-vline      INTO ld_text SEPARATED BY SPACE.

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