ABAP Select data from SAP table PVE21 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PVE21 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 PVE21. 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 PVE21 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_PVE21 TYPE STANDARD TABLE OF PVE21,
      WA_PVE21 TYPE PVE21,
      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: <PVE21> TYPE PVE21.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PVE21.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PVE21
  INTO TABLE IT_PVE21.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PVE21
*  INTO TABLE @DATA(IT_PVE212).
*--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_PVE21 INDEX 1 INTO DATA(WA_PVE212).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PVE21 ASSIGNING <PVE21>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PVE21>-XFELD = 1.
<PVE21>-PERNR = 1.
<PVE21>-ENAME = 1.
<PVE21>-FDATE = 1.
<PVE21>-OCRSN = 1.

ENDLOOP.

LOOP AT IT_PVE21 INTO WA_PVE21.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PVE21-OCCAT, sy-vline,
  WA_PVE21-BONDT, sy-vline,
  WA_PVE21-PAYTY, sy-vline,
  WA_PVE21-PAYID, sy-vline,
  WA_PVE21-ABKRS, sy-vline,
  WA_PVE21-PERMO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PVE21 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_PVE21 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_PVE21 INTO WA_PVE21.


*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 GJAHR, internal->external for field PABRJ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_PVE21-PABRJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PVE21-PABRJ.
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_PVE21_STR, 
XFELD TYPE STRING,
PERNR TYPE STRING,
ENAME TYPE STRING,
FDATE TYPE STRING,
OCRSN TYPE STRING,
OCCAT TYPE STRING,
BONDT TYPE STRING,
PAYTY TYPE STRING,
PAYID TYPE STRING,
ABKRS TYPE STRING,
PERMO TYPE STRING,
PABRJ TYPE STRING,
PABRP TYPE STRING,
CDONE TYPE STRING,
ERROR TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PVE21_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_PVE21_STR-XFELD sy-vline 
WA_PVE21_STR-PERNR sy-vline 
WA_PVE21_STR-ENAME sy-vline 
WA_PVE21_STR-FDATE sy-vline 
WA_PVE21_STR-OCRSN sy-vline 
WA_PVE21_STR-OCCAT sy-vline 
WA_PVE21_STR-BONDT sy-vline 
WA_PVE21_STR-PAYTY sy-vline 
WA_PVE21_STR-PAYID sy-vline 
WA_PVE21_STR-ABKRS sy-vline 
WA_PVE21_STR-PERMO sy-vline 
WA_PVE21_STR-PABRJ sy-vline 
WA_PVE21_STR-PABRP sy-vline 
WA_PVE21_STR-CDONE sy-vline 
WA_PVE21_STR-ERROR sy-vline 
WA_PVE21_STR-BEGDA sy-vline 
WA_PVE21_STR-ENDDA sy-vline      INTO ld_text SEPARATED BY SPACE.

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