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

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCWM/LAGPN
*  INTO TABLE @DATA(IT_/SCWM/LAGPN2).
*--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/LAGPN INDEX 1 INTO DATA(WA_/SCWM/LAGPN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCWM/LAGPN>-MANDT = 1.
</SCWM/LAGPN>-LGNUM = 1.
</SCWM/LAGPN>-LGPLA = 1.
</SCWM/LAGPN>-LGTYP = 1.
</SCWM/LAGPN>-LGBER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCWM/LAGPN-LPTYP, sy-vline,
  WA_/SCWM/LAGPN-SKZUE, sy-vline,
  WA_/SCWM/LAGPN-SKZSI, sy-vline,
  WA_/SCWM/LAGPN-KZLER, sy-vline,
  WA_/SCWM/LAGPN-KZVOL, sy-vline,
  WA_/SCWM/LAGPN-AISLE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCWM/LAGPN 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/LAGPN 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/LAGPN INTO WA_/SCWM/LAGPN.


*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 ALPH0, internal->external for field REM_BIN_DEPTH
CALL FUNCTION 'CONVERSION_EXIT_ALPH0_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LAGPN-REM_BIN_DEPTH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LAGPN-REM_BIN_DEPTH.
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/LAGPN_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
LGPLA TYPE STRING,
LGTYP TYPE STRING,
LGBER TYPE STRING,
LPTYP TYPE STRING,
SKZUE TYPE STRING,
SKZSI TYPE STRING,
KZLER TYPE STRING,
KZVOL TYPE STRING,
AISLE TYPE STRING,
LVL_V TYPE STRING,
CLSP_SORT TYPE STRING,
REM_BIN_DEPTH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCWM/LAGPN_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/LAGPN_STR-MANDT sy-vline 
WA_/SCWM/LAGPN_STR-LGNUM sy-vline 
WA_/SCWM/LAGPN_STR-LGPLA sy-vline 
WA_/SCWM/LAGPN_STR-LGTYP sy-vline 
WA_/SCWM/LAGPN_STR-LGBER sy-vline 
WA_/SCWM/LAGPN_STR-LPTYP sy-vline 
WA_/SCWM/LAGPN_STR-SKZUE sy-vline 
WA_/SCWM/LAGPN_STR-SKZSI sy-vline 
WA_/SCWM/LAGPN_STR-KZLER sy-vline 
WA_/SCWM/LAGPN_STR-KZVOL sy-vline 
WA_/SCWM/LAGPN_STR-AISLE sy-vline 
WA_/SCWM/LAGPN_STR-LVL_V sy-vline 
WA_/SCWM/LAGPN_STR-CLSP_SORT sy-vline 
WA_/SCWM/LAGPN_STR-REM_BIN_DEPTH sy-vline      INTO ld_text SEPARATED BY SPACE.

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