ABAP Select data from SAP table MWOG1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MWOG1 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 MWOG1. 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 MWOG1 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_MWOG1 TYPE STANDARD TABLE OF MWOG1,
      WA_MWOG1 TYPE MWOG1,
      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: <MWOG1> TYPE MWOG1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MWOG1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MWOG1
  INTO TABLE IT_MWOG1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MWOG1
*  INTO TABLE @DATA(IT_MWOG12).
*--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_MWOG1 INDEX 1 INTO DATA(WA_MWOG12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MWOG1 ASSIGNING <MWOG1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MWOG1>-MANDT = 1.
<MWOG1>-BESTELLT = 1.
<MWOG1>-MARKFELD = 1.
<MWOG1>-MATNR = 1.
<MWOG1>-MAKTX = 1.

ENDLOOP.

LOOP AT IT_MWOG1 INTO WA_MWOG1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MWOG1-LIFNR, sy-vline,
  WA_MWOG1-LNAME1, sy-vline,
  WA_MWOG1-KTMNG, sy-vline,
  WA_MWOG1-FILME, sy-vline,
  WA_MWOG1-MENGE, sy-vline,
  WA_MWOG1-MEINS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MWOG1 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_MWOG1 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_MWOG1 INTO WA_MWOG1.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MWOG1-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWOG1-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MWOG1-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWOG1-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MWOG1-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWOG1-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MWOG1-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWOG1-VRKME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AKTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MWOG1-AKTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWOG1-AKTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field SATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MWOG1-SATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWOG1-SATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOCNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MWOG1-LOCNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWOG1-LOCNR.
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_MWOG1_STR, 
MANDT TYPE STRING,
BESTELLT TYPE STRING,
MARKFELD TYPE STRING,
MATNR TYPE STRING,
MAKTX TYPE STRING,
LIFNR TYPE STRING,
LNAME1 TYPE STRING,
KTMNG TYPE STRING,
FILME TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
FACTR TYPE STRING,
VRKME TYPE STRING,
SL_EKPNN TYPE STRING,
WAERS TYPE STRING,
SPANE TYPE STRING,
BB_PRICE TYPE STRING,
PEINH TYPE STRING,
WBTYP TYPE STRING,
MWSKZ TYPE STRING,
MATKL TYPE STRING,
AKTNR TYPE STRING,
EKGRP TYPE STRING,
RELIF TYPE STRING,
SATNR TYPE STRING,
SSTUF TYPE STRING,
LOCNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MWOG1_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_MWOG1_STR-MANDT sy-vline 
WA_MWOG1_STR-BESTELLT sy-vline 
WA_MWOG1_STR-MARKFELD sy-vline 
WA_MWOG1_STR-MATNR sy-vline 
WA_MWOG1_STR-MAKTX sy-vline 
WA_MWOG1_STR-LIFNR sy-vline 
WA_MWOG1_STR-LNAME1 sy-vline 
WA_MWOG1_STR-KTMNG sy-vline 
WA_MWOG1_STR-FILME sy-vline 
WA_MWOG1_STR-MENGE sy-vline 
WA_MWOG1_STR-MEINS sy-vline 
WA_MWOG1_STR-FACTR sy-vline 
WA_MWOG1_STR-VRKME sy-vline 
WA_MWOG1_STR-SL_EKPNN sy-vline 
WA_MWOG1_STR-WAERS sy-vline 
WA_MWOG1_STR-SPANE sy-vline 
WA_MWOG1_STR-BB_PRICE sy-vline 
WA_MWOG1_STR-PEINH sy-vline 
WA_MWOG1_STR-WBTYP sy-vline 
WA_MWOG1_STR-MWSKZ sy-vline 
WA_MWOG1_STR-MATKL sy-vline 
WA_MWOG1_STR-AKTNR sy-vline 
WA_MWOG1_STR-EKGRP sy-vline 
WA_MWOG1_STR-RELIF sy-vline 
WA_MWOG1_STR-SATNR sy-vline 
WA_MWOG1_STR-SSTUF sy-vline 
WA_MWOG1_STR-LOCNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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