ABAP Select data from SAP table CHV_CLASS_VIEW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CHV_CLASS_VIEW
*  INTO TABLE @DATA(IT_CHV_CLASS_VIEW2).
*--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_CHV_CLASS_VIEW INDEX 1 INTO DATA(WA_CHV_CLASS_VIEW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CHV_CLASS_VIEW>-SOLLWERT = 1.
<CHV_CLASS_VIEW>-TOLERANZOB = 1.
<CHV_CLASS_VIEW>-TOLERANZUN = 1.
<CHV_CLASS_VIEW>-TOLERWEIOB = 1.
<CHV_CLASS_VIEW>-TOLERWEIUN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CHV_CLASS_VIEW-KLASBREITE, sy-vline,
  WA_CHV_CLASS_VIEW-KLASMITTE, sy-vline,
  WA_CHV_CLASS_VIEW-GRENZEOB1, sy-vline,
  WA_CHV_CLASS_VIEW-GRENZEUN1, sy-vline,
  WA_CHV_CLASS_VIEW-GRENZEOB2, sy-vline,
  WA_CHV_CLASS_VIEW-GRENZEUN2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CHV_CLASS_VIEW 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_CHV_CLASS_VIEW 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_CHV_CLASS_VIEW INTO WA_CHV_CLASS_VIEW.


*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 LUNIT, internal->external for field MASSEINHSW
CALL FUNCTION 'CONVERSION_EXIT_LUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CHV_CLASS_VIEW-MASSEINHSW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CHV_CLASS_VIEW-MASSEINHSW.
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_CHV_CLASS_VIEW_STR, 
SOLLWERT TYPE STRING,
TOLERANZOB TYPE STRING,
TOLERANZUN TYPE STRING,
TOLERWEIOB TYPE STRING,
TOLERWEIUN TYPE STRING,
KLASBREITE TYPE STRING,
KLASMITTE TYPE STRING,
GRENZEOB1 TYPE STRING,
GRENZEUN1 TYPE STRING,
GRENZEOB2 TYPE STRING,
GRENZEUN2 TYPE STRING,
PLAUSIOBEN TYPE STRING,
PLAUSIUNTE TYPE STRING,
QUALITAT TYPE STRING,
ALTERNAT TYPE STRING,
MASSEINHSW TYPE STRING,
KATSCHLGW1 TYPE STRING,
KATSCHLGW2 TYPE STRING,
KATSCHLGW3 TYPE STRING,
KATSCHLGW4 TYPE STRING,
KATSCHLGW5 TYPE STRING,
AWMNGKTX1 TYPE STRING,
AWMNGKTX2 TYPE STRING,
AWMNGKTX3 TYPE STRING,
AWMNGKTX4 TYPE STRING,
AWMNGKTX5 TYPE STRING,
ATTRIBUTES_TEXT TYPE STRING,
LIFNR_TXT TYPE STRING,
KUNR_TXT TYPE STRING,
MATNR_TXT TYPE STRING,
WERKS_TXT TYPE STRING,
PSPNR_TXT TYPE STRING,
VERID_TXT TYPE STRING,
EFF_PARAMETER TYPE STRING,
OBJ_DELETED TYPE STRING,
ORIGIN TYPE STRING,
CHV_LOCK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CHV_CLASS_VIEW_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_CHV_CLASS_VIEW_STR-SOLLWERT sy-vline 
WA_CHV_CLASS_VIEW_STR-TOLERANZOB sy-vline 
WA_CHV_CLASS_VIEW_STR-TOLERANZUN sy-vline 
WA_CHV_CLASS_VIEW_STR-TOLERWEIOB sy-vline 
WA_CHV_CLASS_VIEW_STR-TOLERWEIUN sy-vline 
WA_CHV_CLASS_VIEW_STR-KLASBREITE sy-vline 
WA_CHV_CLASS_VIEW_STR-KLASMITTE sy-vline 
WA_CHV_CLASS_VIEW_STR-GRENZEOB1 sy-vline 
WA_CHV_CLASS_VIEW_STR-GRENZEUN1 sy-vline 
WA_CHV_CLASS_VIEW_STR-GRENZEOB2 sy-vline 
WA_CHV_CLASS_VIEW_STR-GRENZEUN2 sy-vline 
WA_CHV_CLASS_VIEW_STR-PLAUSIOBEN sy-vline 
WA_CHV_CLASS_VIEW_STR-PLAUSIUNTE sy-vline 
WA_CHV_CLASS_VIEW_STR-QUALITAT sy-vline 
WA_CHV_CLASS_VIEW_STR-ALTERNAT sy-vline 
WA_CHV_CLASS_VIEW_STR-MASSEINHSW sy-vline 
WA_CHV_CLASS_VIEW_STR-KATSCHLGW1 sy-vline 
WA_CHV_CLASS_VIEW_STR-KATSCHLGW2 sy-vline 
WA_CHV_CLASS_VIEW_STR-KATSCHLGW3 sy-vline 
WA_CHV_CLASS_VIEW_STR-KATSCHLGW4 sy-vline 
WA_CHV_CLASS_VIEW_STR-KATSCHLGW5 sy-vline 
WA_CHV_CLASS_VIEW_STR-AWMNGKTX1 sy-vline 
WA_CHV_CLASS_VIEW_STR-AWMNGKTX2 sy-vline 
WA_CHV_CLASS_VIEW_STR-AWMNGKTX3 sy-vline 
WA_CHV_CLASS_VIEW_STR-AWMNGKTX4 sy-vline 
WA_CHV_CLASS_VIEW_STR-AWMNGKTX5 sy-vline 
WA_CHV_CLASS_VIEW_STR-ATTRIBUTES_TEXT sy-vline 
WA_CHV_CLASS_VIEW_STR-LIFNR_TXT sy-vline 
WA_CHV_CLASS_VIEW_STR-KUNR_TXT sy-vline 
WA_CHV_CLASS_VIEW_STR-MATNR_TXT sy-vline 
WA_CHV_CLASS_VIEW_STR-WERKS_TXT sy-vline 
WA_CHV_CLASS_VIEW_STR-PSPNR_TXT sy-vline 
WA_CHV_CLASS_VIEW_STR-VERID_TXT sy-vline 
WA_CHV_CLASS_VIEW_STR-EFF_PARAMETER sy-vline 
WA_CHV_CLASS_VIEW_STR-OBJ_DELETED sy-vline 
WA_CHV_CLASS_VIEW_STR-ORIGIN sy-vline 
WA_CHV_CLASS_VIEW_STR-CHV_LOCK sy-vline      INTO ld_text SEPARATED BY SPACE.

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