ABAP Select data from SAP table CHV_CLASS_DATA_INTERFACE 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_DATA_INTERFACE 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_DATA_INTERFACE. 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_DATA_INTERFACE 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_DATA_INTERFACE TYPE STANDARD TABLE OF CHV_CLASS_DATA_INTERFACE,
      WA_CHV_CLASS_DATA_INTERFACE TYPE CHV_CLASS_DATA_INTERFACE,
      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_DATA_INTERFACE> TYPE CHV_CLASS_DATA_INTERFACE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CHV_CLASS_DATA_INTERFACE
*  INTO TABLE @DATA(IT_CHV_CLASS_DATA_INTERFACE2).
*--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_DATA_INTERFACE INDEX 1 INTO DATA(WA_CHV_CLASS_DATA_INTERFACE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CHV_CLASS_DATA_INTERFACE>-PLNTY = 1.
<CHV_CLASS_DATA_INTERFACE>-PLNNR = 1.
<CHV_CLASS_DATA_INTERFACE>-PLNAL = 1.
<CHV_CLASS_DATA_INTERFACE>-PLNFL = 1.
<CHV_CLASS_DATA_INTERFACE>-OPRID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CHV_CLASS_DATA_INTERFACE-VORNR, sy-vline,
  WA_CHV_CLASS_DATA_INTERFACE-MERKNR, sy-vline,
  WA_CHV_CLASS_DATA_INTERFACE-ZUORDNR, sy-vline,
  WA_CHV_CLASS_DATA_INTERFACE-GUELTIGAB, sy-vline,
  WA_CHV_CLASS_DATA_INTERFACE-AENDERGNR, sy-vline,
  WA_CHV_CLASS_DATA_INTERFACE-AENNR_AUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CHV_CLASS_DATA_INTERFACE 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_DATA_INTERFACE 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_DATA_INTERFACE INTO WA_CHV_CLASS_DATA_INTERFACE.


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

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

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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_CHV_CLASS_DATA_INTERFACE-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CHV_CLASS_DATA_INTERFACE-VORNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field MASSEINHSW
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CHV_CLASS_DATA_INTERFACE-MASSEINHSW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CHV_CLASS_DATA_INTERFACE-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_DATA_INTERFACE_STR, 
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
PLNFL TYPE STRING,
OPRID TYPE STRING,
VORNR TYPE STRING,
MERKNR TYPE STRING,
ZUORDNR TYPE STRING,
GUELTIGAB TYPE STRING,
AENDERGNR TYPE STRING,
AENNR_AUS TYPE STRING,
DATUB TYPE STRING,
LOEKZ TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LIFNR TYPE STRING,
KUNR TYPE STRING,
PSNFH TYPE STRING,
STELLEN TYPE STRING,
MASSEINHSW TYPE STRING,
MEAS_UNIT_ISO TYPE STRING,
SOLLWERT TYPE STRING,
TOLERANZOB TYPE STRING,
TOLERANZUN TYPE STRING,
KLASANZAHL 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,
AUSWMENGE1 TYPE STRING,
AUSWMGWRK1 TYPE STRING,
KATALGART2 TYPE STRING,
AUSWMENGE2 TYPE STRING,
KATALGART3 TYPE STRING,
AUSWMENGE3 TYPE STRING,
KATALGART4 TYPE STRING,
AUSWMENGE4 TYPE STRING,
KATALGART5 TYPE STRING,
AUSWMENGE5 TYPE STRING,
TOLERWAB TYPE STRING,
TOLERWBIS TYPE STRING,
DUMMY10 TYPE STRING,
DUMMY20 TYPE STRING,
DUMMY40 TYPE STRING,
SUCHFELD TYPE STRING,
MS_OBJECT TYPE STRING,
MS_OBJTYPE TYPE STRING,
MS_REF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CHV_CLASS_DATA_INTERFACE_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_DATA_INTERFACE_STR-PLNTY sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-PLNNR sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-PLNAL sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-PLNFL sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-OPRID sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-VORNR sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-MERKNR sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-ZUORDNR sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-GUELTIGAB sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-AENDERGNR sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-AENNR_AUS sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-DATUB sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-LOEKZ sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-MATNR sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-WERKS sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-LIFNR sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-KUNR sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-PSNFH sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-STELLEN sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-MASSEINHSW sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-MEAS_UNIT_ISO sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-SOLLWERT sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-TOLERANZOB sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-TOLERANZUN sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-KLASANZAHL sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-KLASBREITE sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-KLASMITTE sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-GRENZEOB1 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-GRENZEUN1 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-GRENZEOB2 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-GRENZEUN2 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-PLAUSIOBEN sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-PLAUSIUNTE sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-AUSWMENGE1 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-AUSWMGWRK1 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-KATALGART2 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-AUSWMENGE2 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-KATALGART3 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-AUSWMENGE3 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-KATALGART4 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-AUSWMENGE4 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-KATALGART5 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-AUSWMENGE5 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-TOLERWAB sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-TOLERWBIS sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-DUMMY10 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-DUMMY20 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-DUMMY40 sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-SUCHFELD sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-MS_OBJECT sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-MS_OBJTYPE sy-vline 
WA_CHV_CLASS_DATA_INTERFACE_STR-MS_REF sy-vline      INTO ld_text SEPARATED BY SPACE.

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