ABAP Select data from SAP table WVMI_ALV_PAH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WVMI_ALV_PAH
*  INTO TABLE @DATA(IT_WVMI_ALV_PAH2).
*--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_WVMI_ALV_PAH INDEX 1 INTO DATA(WA_WVMI_ALV_PAH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WVMI_ALV_PAH>-DOCNUM = 1.
<WVMI_ALV_PAH>-LIFNR = 1.
<WVMI_ALV_PAH>-LIFNRNAME = 1.
<WVMI_ALV_PAH>-KUNNR = 1.
<WVMI_ALV_PAH>-KUNNRNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WVMI_ALV_PAH-WERKS, sy-vline,
  WA_WVMI_ALV_PAH-WERKSNAME, sy-vline,
  WA_WVMI_ALV_PAH-KUNNRWE, sy-vline,
  WA_WVMI_ALV_PAH-KUNNRWENAME, sy-vline,
  WA_WVMI_ALV_PAH-CREDAT, sy-vline,
  WA_WVMI_ALV_PAH-CRETIM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WVMI_ALV_PAH 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_WVMI_ALV_PAH 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_WVMI_ALV_PAH INTO WA_WVMI_ALV_PAH.


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

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

*Conversion exit ALPHA, internal->external for field KUNNRWE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WVMI_ALV_PAH-KUNNRWE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVMI_ALV_PAH-KUNNRWE.
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_WVMI_ALV_PAH_STR, 
DOCNUM TYPE STRING,
LIFNR TYPE STRING,
LIFNRNAME TYPE STRING,
KUNNR TYPE STRING,
KUNNRNAME TYPE STRING,
WERKS TYPE STRING,
WERKSNAME TYPE STRING,
KUNNRWE TYPE STRING,
KUNNRWENAME TYPE STRING,
CREDAT TYPE STRING,
CRETIM TYPE STRING,
STATUS TYPE STRING,
EXPAND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WVMI_ALV_PAH_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_WVMI_ALV_PAH_STR-DOCNUM sy-vline 
WA_WVMI_ALV_PAH_STR-LIFNR sy-vline 
WA_WVMI_ALV_PAH_STR-LIFNRNAME sy-vline 
WA_WVMI_ALV_PAH_STR-KUNNR sy-vline 
WA_WVMI_ALV_PAH_STR-KUNNRNAME sy-vline 
WA_WVMI_ALV_PAH_STR-WERKS sy-vline 
WA_WVMI_ALV_PAH_STR-WERKSNAME sy-vline 
WA_WVMI_ALV_PAH_STR-KUNNRWE sy-vline 
WA_WVMI_ALV_PAH_STR-KUNNRWENAME sy-vline 
WA_WVMI_ALV_PAH_STR-CREDAT sy-vline 
WA_WVMI_ALV_PAH_STR-CRETIM sy-vline 
WA_WVMI_ALV_PAH_STR-STATUS sy-vline 
WA_WVMI_ALV_PAH_STR-EXPAND sy-vline      INTO ld_text SEPARATED BY SPACE.

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