ABAP Select data from SAP table WAPPT into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WAPPT 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 WAPPT. 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 WAPPT 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_WAPPT TYPE STANDARD TABLE OF WAPPT,
      WA_WAPPT TYPE WAPPT,
      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: <WAPPT> TYPE WAPPT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WAPPT
*  INTO TABLE @DATA(IT_WAPPT2).
*--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_WAPPT INDEX 1 INTO DATA(WA_WAPPT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WAPPT>-MANDT = 1.
<WAPPT>-VBTYP = 1.
<WAPPT>-BELNR = 1.
<WAPPT>-LFNDR = 1.
<WAPPT>-BLTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WAPPT-LGNUM, sy-vline,
  WA_WAPPT-LGTOR, sy-vline,
  WA_WAPPT-DATAB, sy-vline,
  WA_WAPPT-DATBI, sy-vline,
  WA_WAPPT-UHRAB, sy-vline,
  WA_WAPPT-UHRBI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WAPPT 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_WAPPT 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_WAPPT INTO WA_WAPPT.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WAPPT-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAPPT-BELNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WAPPT-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAPPT-EBELN.
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_WAPPT_STR, 
MANDT TYPE STRING,
VBTYP TYPE STRING,
BELNR TYPE STRING,
LFNDR TYPE STRING,
BLTYP TYPE STRING,
LGNUM TYPE STRING,
LGTOR TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
UHRAB TYPE STRING,
UHRBI TYPE STRING,
FTEXT TYPE STRING,
LIFNR TYPE STRING,
SPDNR TYPE STRING,
DATIA TYPE STRING,
DATIB TYPE STRING,
UHRIA TYPE STRING,
UHRIB TYPE STRING,
EBELN TYPE STRING,
DATPA TYPE STRING,
UHRPA TYPE STRING,
DATPB TYPE STRING,
UHRPB TYPE STRING,
APPAG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WAPPT_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_WAPPT_STR-MANDT sy-vline 
WA_WAPPT_STR-VBTYP sy-vline 
WA_WAPPT_STR-BELNR sy-vline 
WA_WAPPT_STR-LFNDR sy-vline 
WA_WAPPT_STR-BLTYP sy-vline 
WA_WAPPT_STR-LGNUM sy-vline 
WA_WAPPT_STR-LGTOR sy-vline 
WA_WAPPT_STR-DATAB sy-vline 
WA_WAPPT_STR-DATBI sy-vline 
WA_WAPPT_STR-UHRAB sy-vline 
WA_WAPPT_STR-UHRBI sy-vline 
WA_WAPPT_STR-FTEXT sy-vline 
WA_WAPPT_STR-LIFNR sy-vline 
WA_WAPPT_STR-SPDNR sy-vline 
WA_WAPPT_STR-DATIA sy-vline 
WA_WAPPT_STR-DATIB sy-vline 
WA_WAPPT_STR-UHRIA sy-vline 
WA_WAPPT_STR-UHRIB sy-vline 
WA_WAPPT_STR-EBELN sy-vline 
WA_WAPPT_STR-DATPA sy-vline 
WA_WAPPT_STR-UHRPA sy-vline 
WA_WAPPT_STR-DATPB sy-vline 
WA_WAPPT_STR-UHRPB sy-vline 
WA_WAPPT_STR-APPAG sy-vline      INTO ld_text SEPARATED BY SPACE.

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