ABAP Select data from SAP table PAR_NVAC into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PAR_NVAC
*  INTO TABLE @DATA(IT_PAR_NVAC2).
*--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_PAR_NVAC INDEX 1 INTO DATA(WA_PAR_NVAC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PAR_NVAC>-PERNR = 1.
<PAR_NVAC>-ENAME = 1.
<PAR_NVAC>-WERKSD = 1.
<PAR_NVAC>-BTRTLD = 1.
<PAR_NVAC>-SIGLOC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PAR_NVAC-SIGDAY, sy-vline,
  WA_PAR_NVAC-SIGMON, sy-vline,
  WA_PAR_NVAC-SIGYEA, sy-vline,
  WA_PAR_NVAC-VYEAR, sy-vline,
  WA_PAR_NVAC-VDAYS, sy-vline,
  WA_PAR_NVAC-WDAY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PAR_NVAC 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_PAR_NVAC 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_PAR_NVAC INTO WA_PAR_NVAC.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_PAR_NVAC_STR, 
PERNR TYPE STRING,
ENAME TYPE STRING,
WERKSD TYPE STRING,
BTRTLD TYPE STRING,
SIGLOC TYPE STRING,
SIGDAY TYPE STRING,
SIGMON TYPE STRING,
SIGYEA TYPE STRING,
VYEAR TYPE STRING,
VDAYS TYPE STRING,
WDAY TYPE STRING,
VDAY TYPE STRING,
VMONTH TYPE STRING,
RETDAY TYPE STRING,
RETMON TYPE STRING,
RETYEA TYPE STRING,
CYEAR TYPE STRING,
TPVAC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PAR_NVAC_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_PAR_NVAC_STR-PERNR sy-vline 
WA_PAR_NVAC_STR-ENAME sy-vline 
WA_PAR_NVAC_STR-WERKSD sy-vline 
WA_PAR_NVAC_STR-BTRTLD sy-vline 
WA_PAR_NVAC_STR-SIGLOC sy-vline 
WA_PAR_NVAC_STR-SIGDAY sy-vline 
WA_PAR_NVAC_STR-SIGMON sy-vline 
WA_PAR_NVAC_STR-SIGYEA sy-vline 
WA_PAR_NVAC_STR-VYEAR sy-vline 
WA_PAR_NVAC_STR-VDAYS sy-vline 
WA_PAR_NVAC_STR-WDAY sy-vline 
WA_PAR_NVAC_STR-VDAY sy-vline 
WA_PAR_NVAC_STR-VMONTH sy-vline 
WA_PAR_NVAC_STR-RETDAY sy-vline 
WA_PAR_NVAC_STR-RETMON sy-vline 
WA_PAR_NVAC_STR-RETYEA sy-vline 
WA_PAR_NVAC_STR-CYEAR sy-vline 
WA_PAR_NVAC_STR-TPVAC sy-vline      INTO ld_text SEPARATED BY SPACE.

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