ABAP Select data from SAP table CNV_21500_PDC_REF into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_21500_PDC_REF 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 CNV_21500_PDC_REF. 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 CNV_21500_PDC_REF 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_CNV_21500_PDC_REF TYPE STANDARD TABLE OF CNV_21500_PDC_REF,
      WA_CNV_21500_PDC_REF TYPE CNV_21500_PDC_REF,
      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: <CNV_21500_PDC_REF> TYPE CNV_21500_PDC_REF.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CNV_21500_PDC_REF.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CNV_21500_PDC_REF
  INTO TABLE IT_CNV_21500_PDC_REF.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_21500_PDC_REF
*  INTO TABLE @DATA(IT_CNV_21500_PDC_REF2).
*--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_CNV_21500_PDC_REF INDEX 1 INTO DATA(WA_CNV_21500_PDC_REF2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CNV_21500_PDC_REF ASSIGNING <CNV_21500_PDC_REF>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_21500_PDC_REF>-BUKRS = 1.
<CNV_21500_PDC_REF>-GSBER = 1.
<CNV_21500_PDC_REF>-KOSTL = 1.
<CNV_21500_PDC_REF>-LTLST = 1.
<CNV_21500_PDC_REF>-AUFNR = 1.

ENDLOOP.

LOOP AT IT_CNV_21500_PDC_REF INTO WA_CNV_21500_PDC_REF.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_21500_PDC_REF-KSTRG, sy-vline,
  WA_CNV_21500_PDC_REF-POSID, sy-vline,
  WA_CNV_21500_PDC_REF-NPLNR, sy-vline,
  WA_CNV_21500_PDC_REF-VORNR, sy-vline,
  WA_CNV_21500_PDC_REF-KDAUF, sy-vline,
  WA_CNV_21500_PDC_REF-KDPOS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_21500_PDC_REF 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_CNV_21500_PDC_REF 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_CNV_21500_PDC_REF INTO WA_CNV_21500_PDC_REF.


*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_CNV_21500_PDC_REF_STR, 
BUKRS TYPE STRING,
GSBER TYPE STRING,
KOSTL TYPE STRING,
LTLST TYPE STRING,
AUFNR TYPE STRING,
KSTRG TYPE STRING,
POSID TYPE STRING,
NPLNR TYPE STRING,
VORNR TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
PRZNR TYPE STRING,
FISTL TYPE STRING,
GEBER TYPE STRING,
SKOST TYPE STRING,
SBUKR TYPE STRING,
SGSBR TYPE STRING,
SGTXT TYPE STRING,
DART TYPE STRING,
UDART TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_21500_PDC_REF_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_CNV_21500_PDC_REF_STR-BUKRS sy-vline 
WA_CNV_21500_PDC_REF_STR-GSBER sy-vline 
WA_CNV_21500_PDC_REF_STR-KOSTL sy-vline 
WA_CNV_21500_PDC_REF_STR-LTLST sy-vline 
WA_CNV_21500_PDC_REF_STR-AUFNR sy-vline 
WA_CNV_21500_PDC_REF_STR-KSTRG sy-vline 
WA_CNV_21500_PDC_REF_STR-POSID sy-vline 
WA_CNV_21500_PDC_REF_STR-NPLNR sy-vline 
WA_CNV_21500_PDC_REF_STR-VORNR sy-vline 
WA_CNV_21500_PDC_REF_STR-KDAUF sy-vline 
WA_CNV_21500_PDC_REF_STR-KDPOS sy-vline 
WA_CNV_21500_PDC_REF_STR-PRZNR sy-vline 
WA_CNV_21500_PDC_REF_STR-FISTL sy-vline 
WA_CNV_21500_PDC_REF_STR-GEBER sy-vline 
WA_CNV_21500_PDC_REF_STR-SKOST sy-vline 
WA_CNV_21500_PDC_REF_STR-SBUKR sy-vline 
WA_CNV_21500_PDC_REF_STR-SGSBR sy-vline 
WA_CNV_21500_PDC_REF_STR-SGTXT sy-vline 
WA_CNV_21500_PDC_REF_STR-DART sy-vline 
WA_CNV_21500_PDC_REF_STR-UDART sy-vline      INTO ld_text SEPARATED BY SPACE.

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