ABAP Select data from SAP table WPMLGT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WPMLGT
*  INTO TABLE @DATA(IT_WPMLGT2).
*--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_WPMLGT INDEX 1 INTO DATA(WA_WPMLGT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WPMLGT>-DATUM = 1.
<WPMLGT>-UTIME = 1.
<WPMLGT>-AENNR = 1.
<WPMLGT>-CHANGENR = 1.
<WPMLGT>-CHGFLAG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WPMLGT-MANDT, sy-vline,
  WA_WPMLGT-MATNR, sy-vline,
  WA_WPMLGT-LGNUM, sy-vline,
  WA_WPMLGT-LGTYP, sy-vline,
  WA_WPMLGT-LVORM, sy-vline,
  WA_WPMLGT-LGPLA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WPMLGT 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_WPMLGT 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_WPMLGT INTO WA_WPMLGT.


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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WPMLGT-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WPMLGT-MATNR.
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_WPMLGT_STR, 
DATUM TYPE STRING,
UTIME TYPE STRING,
AENNR TYPE STRING,
CHANGENR TYPE STRING,
CHGFLAG TYPE STRING,
MANDT TYPE STRING,
MATNR TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
LVORM TYPE STRING,
LGPLA TYPE STRING,
LPMAX TYPE STRING,
LPMIN TYPE STRING,
MAMNG TYPE STRING,
NSMNG TYPE STRING,
KOBER TYPE STRING,
RDMNG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WPMLGT_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_WPMLGT_STR-DATUM sy-vline 
WA_WPMLGT_STR-UTIME sy-vline 
WA_WPMLGT_STR-AENNR sy-vline 
WA_WPMLGT_STR-CHANGENR sy-vline 
WA_WPMLGT_STR-CHGFLAG sy-vline 
WA_WPMLGT_STR-MANDT sy-vline 
WA_WPMLGT_STR-MATNR sy-vline 
WA_WPMLGT_STR-LGNUM sy-vline 
WA_WPMLGT_STR-LGTYP sy-vline 
WA_WPMLGT_STR-LVORM sy-vline 
WA_WPMLGT_STR-LGPLA sy-vline 
WA_WPMLGT_STR-LPMAX sy-vline 
WA_WPMLGT_STR-LPMIN sy-vline 
WA_WPMLGT_STR-MAMNG sy-vline 
WA_WPMLGT_STR-NSMNG sy-vline 
WA_WPMLGT_STR-KOBER sy-vline 
WA_WPMLGT_STR-RDMNG sy-vline      INTO ld_text SEPARATED BY SPACE.

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