ABAP Select data from SAP table PURCH_WERE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PURCH_WERE
*  INTO TABLE @DATA(IT_PURCH_WERE2).
*--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_PURCH_WERE INDEX 1 INTO DATA(WA_PURCH_WERE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PURCH_WERE>-KNUMH = 1.
<PURCH_WERE>-KOPOS = 1.
<PURCH_WERE>-EBELN = 1.
<PURCH_WERE>-EBELP = 1.
<PURCH_WERE>-LIFNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PURCH_WERE-MATNR, sy-vline,
  WA_PURCH_WERE-WERKS, sy-vline,
  WA_PURCH_WERE-BSTMG, sy-vline,
  WA_PURCH_WERE-WEMNG, sy-vline,
  WA_PURCH_WERE-OWEMG, sy-vline,
  WA_PURCH_WERE-OWEPZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PURCH_WERE 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_PURCH_WERE 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_PURCH_WERE INTO WA_PURCH_WERE.


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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_PURCH_WERE-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PURCH_WERE-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PURCH_WERE-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PURCH_WERE-MEINS.
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_PURCH_WERE_STR, 
KNUMH TYPE STRING,
KOPOS TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
LIFNR TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
BSTMG TYPE STRING,
WEMNG TYPE STRING,
OWEMG TYPE STRING,
OWEPZ TYPE STRING,
REMNG TYPE STRING,
OREMG TYPE STRING,
OREPZ TYPE STRING,
ELIKZ TYPE STRING,
MEINS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PURCH_WERE_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_PURCH_WERE_STR-KNUMH sy-vline 
WA_PURCH_WERE_STR-KOPOS sy-vline 
WA_PURCH_WERE_STR-EBELN sy-vline 
WA_PURCH_WERE_STR-EBELP sy-vline 
WA_PURCH_WERE_STR-LIFNR sy-vline 
WA_PURCH_WERE_STR-MATNR sy-vline 
WA_PURCH_WERE_STR-WERKS sy-vline 
WA_PURCH_WERE_STR-BSTMG sy-vline 
WA_PURCH_WERE_STR-WEMNG sy-vline 
WA_PURCH_WERE_STR-OWEMG sy-vline 
WA_PURCH_WERE_STR-OWEPZ sy-vline 
WA_PURCH_WERE_STR-REMNG sy-vline 
WA_PURCH_WERE_STR-OREMG sy-vline 
WA_PURCH_WERE_STR-OREPZ sy-vline 
WA_PURCH_WERE_STR-ELIKZ sy-vline 
WA_PURCH_WERE_STR-MEINS sy-vline      INTO ld_text SEPARATED BY SPACE.

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