ABAP Select data from SAP table WMGMA into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WMGMA
*  INTO TABLE @DATA(IT_WMGMA2).
*--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_WMGMA INDEX 1 INTO DATA(WA_WMGMA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WMGMA>-MATNR = 1.
<WMGMA>-MAKTX = 1.
<WMGMA>-MATKL = 1.
<WMGMA>-MEINS = 1.
<WMGMA>-ATTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WMGMA-MTART, sy-vline,
  WA_WMGMA-CUOBJ, sy-vline,
  WA_WMGMA-LVORM, sy-vline,
  WA_WMGMA-SAISO, sy-vline,
  WA_WMGMA-KJAHR, sy-vline,
  WA_WMGMA-SATNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WMGMA 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_WMGMA 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_WMGMA INTO WA_WMGMA.


*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_WMGMA-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WMGMA-MATNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field KJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WMGMA-KJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WMGMA-KJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field SATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WMGMA-SATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WMGMA-SATNR.
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_WMGMA_STR, 
MATNR TYPE STRING,
MAKTX TYPE STRING,
MATKL TYPE STRING,
MEINS TYPE STRING,
ATTYP TYPE STRING,
MTART TYPE STRING,
CUOBJ TYPE STRING,
LVORM TYPE STRING,
SAISO TYPE STRING,
KJAHR TYPE STRING,
SATNR TYPE STRING,
CUOBF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WMGMA_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_WMGMA_STR-MATNR sy-vline 
WA_WMGMA_STR-MAKTX sy-vline 
WA_WMGMA_STR-MATKL sy-vline 
WA_WMGMA_STR-MEINS sy-vline 
WA_WMGMA_STR-ATTYP sy-vline 
WA_WMGMA_STR-MTART sy-vline 
WA_WMGMA_STR-CUOBJ sy-vline 
WA_WMGMA_STR-LVORM sy-vline 
WA_WMGMA_STR-SAISO sy-vline 
WA_WMGMA_STR-KJAHR sy-vline 
WA_WMGMA_STR-SATNR sy-vline 
WA_WMGMA_STR-CUOBF sy-vline      INTO ld_text SEPARATED BY SPACE.

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