ABAP Select data from SAP table PVCMPV_LI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PVCMPV_LI
*  INTO TABLE @DATA(IT_PVCMPV_LI2).
*--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_PVCMPV_LI INDEX 1 INTO DATA(WA_PVCMPV_LI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PVCMPV_LI>-PVGUID = 1.
<PVCMPV_LI>-AENNR = 1.
<PVCMPV_LI>-ROMS1 = 1.
<PVCMPV_LI>-PRCNT1 = 1.
<PVCMPV_LI>-ROMS2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PVCMPV_LI-PRCNT2, sy-vline,
  WA_PVCMPV_LI-ROMS3, sy-vline,
  WA_PVCMPV_LI-PRCNT3, sy-vline,
  WA_PVCMPV_LI-ROMEI, sy-vline,
  WA_PVCMPV_LI-ROMEN, sy-vline,
  WA_PVCMPV_LI-ROKME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PVCMPV_LI 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_PVCMPV_LI 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_PVCMPV_LI INTO WA_PVCMPV_LI.


*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_PVCMPV_LI-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PVCMPV_LI-AENNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field ROKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PVCMPV_LI-ROKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PVCMPV_LI-ROKME.
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_PVCMPV_LI_STR, 
PVGUID TYPE STRING,
AENNR TYPE STRING,
ROMS1 TYPE STRING,
PRCNT1 TYPE STRING,
ROMS2 TYPE STRING,
PRCNT2 TYPE STRING,
ROMS3 TYPE STRING,
PRCNT3 TYPE STRING,
ROMEI TYPE STRING,
ROMEN TYPE STRING,
ROKME TYPE STRING,
RFORM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PVCMPV_LI_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_PVCMPV_LI_STR-PVGUID sy-vline 
WA_PVCMPV_LI_STR-AENNR sy-vline 
WA_PVCMPV_LI_STR-ROMS1 sy-vline 
WA_PVCMPV_LI_STR-PRCNT1 sy-vline 
WA_PVCMPV_LI_STR-ROMS2 sy-vline 
WA_PVCMPV_LI_STR-PRCNT2 sy-vline 
WA_PVCMPV_LI_STR-ROMS3 sy-vline 
WA_PVCMPV_LI_STR-PRCNT3 sy-vline 
WA_PVCMPV_LI_STR-ROMEI sy-vline 
WA_PVCMPV_LI_STR-ROMEN sy-vline 
WA_PVCMPV_LI_STR-ROKME sy-vline 
WA_PVCMPV_LI_STR-RFORM sy-vline      INTO ld_text SEPARATED BY SPACE.

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