ABAP Select data from SAP table /SCWM/QUAN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCWM/QUAN
*  INTO TABLE @DATA(IT_/SCWM/QUAN2).
*--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_/SCWM/QUAN INDEX 1 INTO DATA(WA_/SCWM/QUAN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCWM/QUAN>-MANDT = 1.
</SCWM/QUAN>-GUID_PARENT = 1.
</SCWM/QUAN>-GUID_STOCK = 1.
</SCWM/QUAN>-IDX_STOCK = 1.
</SCWM/QUAN>-GUID_STOCK0 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCWM/QUAN-MEINS, sy-vline,
  WA_/SCWM/QUAN-ALTME, sy-vline,
  WA_/SCWM/QUAN-WEIGHT, sy-vline,
  WA_/SCWM/QUAN-UNIT_W, sy-vline,
  WA_/SCWM/QUAN-VOLUM, sy-vline,
  WA_/SCWM/QUAN-UNIT_V, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCWM/QUAN 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_/SCWM/QUAN 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_/SCWM/QUAN INTO WA_/SCWM/QUAN.


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

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

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

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

*Conversion exit CUNIT, internal->external for field CWUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/QUAN-CWUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/QUAN-CWUNIT.
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_/SCWM/QUAN_STR, 
MANDT TYPE STRING,
GUID_PARENT TYPE STRING,
GUID_STOCK TYPE STRING,
IDX_STOCK TYPE STRING,
GUID_STOCK0 TYPE STRING,
MEINS TYPE STRING,
ALTME TYPE STRING,
WEIGHT TYPE STRING,
UNIT_W TYPE STRING,
VOLUM TYPE STRING,
UNIT_V TYPE STRING,
CAPA TYPE STRING,
WDATU TYPE STRING,
VFDAT TYPE STRING,
COO TYPE STRING,
BRESTR TYPE STRING,
INSPTYP TYPE STRING,
INSPID TYPE STRING,
IDPLATE TYPE STRING,
QDOCCAT TYPE STRING,
QDOCID TYPE STRING,
QITMID TYPE STRING,
CWUNIT TYPE STRING,
CWEXACT TYPE STRING,
SKZSI TYPE STRING,
DSTGRP TYPE STRING,
SN_STOCK TYPE STRING,
QET TYPE STRING,
CNT TYPE STRING,
QITM_CANCEL TYPE STRING,
QUAN_DUMMY TYPE STRING,
ZEUGN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCWM/QUAN_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_/SCWM/QUAN_STR-MANDT sy-vline 
WA_/SCWM/QUAN_STR-GUID_PARENT sy-vline 
WA_/SCWM/QUAN_STR-GUID_STOCK sy-vline 
WA_/SCWM/QUAN_STR-IDX_STOCK sy-vline 
WA_/SCWM/QUAN_STR-GUID_STOCK0 sy-vline 
WA_/SCWM/QUAN_STR-MEINS sy-vline 
WA_/SCWM/QUAN_STR-ALTME sy-vline 
WA_/SCWM/QUAN_STR-WEIGHT sy-vline 
WA_/SCWM/QUAN_STR-UNIT_W sy-vline 
WA_/SCWM/QUAN_STR-VOLUM sy-vline 
WA_/SCWM/QUAN_STR-UNIT_V sy-vline 
WA_/SCWM/QUAN_STR-CAPA sy-vline 
WA_/SCWM/QUAN_STR-WDATU sy-vline 
WA_/SCWM/QUAN_STR-VFDAT sy-vline 
WA_/SCWM/QUAN_STR-COO sy-vline 
WA_/SCWM/QUAN_STR-BRESTR sy-vline 
WA_/SCWM/QUAN_STR-INSPTYP sy-vline 
WA_/SCWM/QUAN_STR-INSPID sy-vline 
WA_/SCWM/QUAN_STR-IDPLATE sy-vline 
WA_/SCWM/QUAN_STR-QDOCCAT sy-vline 
WA_/SCWM/QUAN_STR-QDOCID sy-vline 
WA_/SCWM/QUAN_STR-QITMID sy-vline 
WA_/SCWM/QUAN_STR-CWUNIT sy-vline 
WA_/SCWM/QUAN_STR-CWEXACT sy-vline 
WA_/SCWM/QUAN_STR-SKZSI sy-vline 
WA_/SCWM/QUAN_STR-DSTGRP sy-vline 
WA_/SCWM/QUAN_STR-SN_STOCK sy-vline 
WA_/SCWM/QUAN_STR-QET sy-vline 
WA_/SCWM/QUAN_STR-CNT sy-vline 
WA_/SCWM/QUAN_STR-QITM_CANCEL sy-vline 
WA_/SCWM/QUAN_STR-QUAN_DUMMY sy-vline 
WA_/SCWM/QUAN_STR-ZEUGN sy-vline      INTO ld_text SEPARATED BY SPACE.

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