ABAP Select data from SAP table EWAVWA_MWFLDMAP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EWAVWA_MWFLDMAP
*  INTO TABLE @DATA(IT_EWAVWA_MWFLDMAP2).
*--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_EWAVWA_MWFLDMAP INDEX 1 INTO DATA(WA_EWAVWA_MWFLDMAP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EWAVWA_MWFLDMAP>-MANDT = 1.
<EWAVWA_MWFLDMAP>-PROCESSTYPE = 1.
<EWAVWA_MWFLDMAP>-WEIGHPROCINTEXT = 1.
<EWAVWA_MWFLDMAP>-LFDNR = 1.
<EWAVWA_MWFLDMAP>-SOURCETYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EWAVWA_MWFLDMAP-SOURCEPART, sy-vline,
  WA_EWAVWA_MWFLDMAP-SOURCEFIELD, sy-vline,
  WA_EWAVWA_MWFLDMAP-DESTFIELD, sy-vline,
  WA_EWAVWA_MWFLDMAP-TRANSCOND, sy-vline,
  WA_EWAVWA_MWFLDMAP-DOOUTPUTCONV, sy-vline,
  WA_EWAVWA_MWFLDMAP-SEQUENCE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EWAVWA_MWFLDMAP 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_EWAVWA_MWFLDMAP 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_EWAVWA_MWFLDMAP INTO WA_EWAVWA_MWFLDMAP.


*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_EWAVWA_MWFLDMAP_STR, 
MANDT TYPE STRING,
PROCESSTYPE TYPE STRING,
WEIGHPROCINTEXT TYPE STRING,
LFDNR TYPE STRING,
SOURCETYPE TYPE STRING,
SOURCEPART TYPE STRING,
SOURCEFIELD TYPE STRING,
DESTFIELD TYPE STRING,
TRANSCOND TYPE STRING,
DOOUTPUTCONV TYPE STRING,
SEQUENCE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EWAVWA_MWFLDMAP_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_EWAVWA_MWFLDMAP_STR-MANDT sy-vline 
WA_EWAVWA_MWFLDMAP_STR-PROCESSTYPE sy-vline 
WA_EWAVWA_MWFLDMAP_STR-WEIGHPROCINTEXT sy-vline 
WA_EWAVWA_MWFLDMAP_STR-LFDNR sy-vline 
WA_EWAVWA_MWFLDMAP_STR-SOURCETYPE sy-vline 
WA_EWAVWA_MWFLDMAP_STR-SOURCEPART sy-vline 
WA_EWAVWA_MWFLDMAP_STR-SOURCEFIELD sy-vline 
WA_EWAVWA_MWFLDMAP_STR-DESTFIELD sy-vline 
WA_EWAVWA_MWFLDMAP_STR-TRANSCOND sy-vline 
WA_EWAVWA_MWFLDMAP_STR-DOOUTPUTCONV sy-vline 
WA_EWAVWA_MWFLDMAP_STR-SEQUENCE sy-vline      INTO ld_text SEPARATED BY SPACE.

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