ABAP Select data from SAP table CHVW_PRE_EXT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CHVW_PRE_EXT
*  INTO TABLE @DATA(IT_CHVW_PRE_EXT2).
*--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_CHVW_PRE_EXT INDEX 1 INTO DATA(WA_CHVW_PRE_EXT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CHVW_PRE_EXT>-MANDT = 1.
<CHVW_PRE_EXT>-XZUGA = 1.
<CHVW_PRE_EXT>-WERKS = 1.
<CHVW_PRE_EXT>-MATNR = 1.
<CHVW_PRE_EXT>-CHARG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CHVW_PRE_EXT-AUFNR, sy-vline,
  WA_CHVW_PRE_EXT-AUFPS, sy-vline,
  WA_CHVW_PRE_EXT-EBELN, sy-vline,
  WA_CHVW_PRE_EXT-EBELP, sy-vline,
  WA_CHVW_PRE_EXT-RSNUM, sy-vline,
  WA_CHVW_PRE_EXT-RSPOS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CHVW_PRE_EXT 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_CHVW_PRE_EXT 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_CHVW_PRE_EXT INTO WA_CHVW_PRE_EXT.


*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 MATN5, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN5_OUTPUT'
  EXPORTING
    input =                      WA_CHVW_PRE_EXT-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CHVW_PRE_EXT-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit MATN1, internal->external for field MATNR_LONG
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_CHVW_PRE_EXT-MATNR_LONG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CHVW_PRE_EXT-MATNR_LONG.
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_CHVW_PRE_EXT_STR, 
MANDT TYPE STRING,
XZUGA TYPE STRING,
WERKS TYPE STRING,
MATNR TYPE STRING,
CHARG TYPE STRING,
AUFNR TYPE STRING,
AUFPS TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
RSNUM TYPE STRING,
RSPOS TYPE STRING,
RSART TYPE STRING,
VBELN TYPE STRING,
POSNR TYPE STRING,
GENKEY TYPE STRING,
KZBEW TYPE STRING,
SHKZG TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
AUTYP TYPE STRING,
VFDAT TYPE STRING,
MATNR_LONG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CHVW_PRE_EXT_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_CHVW_PRE_EXT_STR-MANDT sy-vline 
WA_CHVW_PRE_EXT_STR-XZUGA sy-vline 
WA_CHVW_PRE_EXT_STR-WERKS sy-vline 
WA_CHVW_PRE_EXT_STR-MATNR sy-vline 
WA_CHVW_PRE_EXT_STR-CHARG sy-vline 
WA_CHVW_PRE_EXT_STR-AUFNR sy-vline 
WA_CHVW_PRE_EXT_STR-AUFPS sy-vline 
WA_CHVW_PRE_EXT_STR-EBELN sy-vline 
WA_CHVW_PRE_EXT_STR-EBELP sy-vline 
WA_CHVW_PRE_EXT_STR-RSNUM sy-vline 
WA_CHVW_PRE_EXT_STR-RSPOS sy-vline 
WA_CHVW_PRE_EXT_STR-RSART sy-vline 
WA_CHVW_PRE_EXT_STR-VBELN sy-vline 
WA_CHVW_PRE_EXT_STR-POSNR sy-vline 
WA_CHVW_PRE_EXT_STR-GENKEY sy-vline 
WA_CHVW_PRE_EXT_STR-KZBEW sy-vline 
WA_CHVW_PRE_EXT_STR-SHKZG sy-vline 
WA_CHVW_PRE_EXT_STR-MENGE sy-vline 
WA_CHVW_PRE_EXT_STR-MEINS sy-vline 
WA_CHVW_PRE_EXT_STR-AUTYP sy-vline 
WA_CHVW_PRE_EXT_STR-VFDAT sy-vline 
WA_CHVW_PRE_EXT_STR-MATNR_LONG sy-vline      INTO ld_text SEPARATED BY SPACE.

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