ABAP Select data from SAP table E1COD_KNVHM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E1COD_KNVHM 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 E1COD_KNVHM. 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 E1COD_KNVHM 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_E1COD_KNVHM TYPE STANDARD TABLE OF E1COD_KNVHM,
      WA_E1COD_KNVHM TYPE E1COD_KNVHM,
      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: <E1COD_KNVHM> TYPE E1COD_KNVHM.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E1COD_KNVHM.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E1COD_KNVHM
  INTO TABLE IT_E1COD_KNVHM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E1COD_KNVHM
*  INTO TABLE @DATA(IT_E1COD_KNVHM2).
*--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_E1COD_KNVHM INDEX 1 INTO DATA(WA_E1COD_KNVHM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E1COD_KNVHM ASSIGNING <E1COD_KNVHM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E1COD_KNVHM>-MSGFN = 1.
<E1COD_KNVHM>-HITYP = 1.
<E1COD_KNVHM>-KUNNR = 1.
<E1COD_KNVHM>-VKORG = 1.
<E1COD_KNVHM>-VTWEG = 1.

ENDLOOP.

LOOP AT IT_E1COD_KNVHM INTO WA_E1COD_KNVHM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E1COD_KNVHM-SPART, sy-vline,
  WA_E1COD_KNVHM-DATAB, sy-vline,
  WA_E1COD_KNVHM-DATBI, sy-vline,
  WA_E1COD_KNVHM-HKUNNR, sy-vline,
  WA_E1COD_KNVHM-HVKORG, sy-vline,
  WA_E1COD_KNVHM-HVTWEG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E1COD_KNVHM 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_E1COD_KNVHM 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_E1COD_KNVHM INTO WA_E1COD_KNVHM.


*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_E1COD_KNVHM_STR, 
MSGFN TYPE STRING,
HITYP TYPE STRING,
KUNNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
HKUNNR TYPE STRING,
HVKORG TYPE STRING,
HVTWEG TYPE STRING,
HSPART TYPE STRING,
GRPNO TYPE STRING,
BOKRE TYPE STRING,
PRFRE TYPE STRING,
HZUOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E1COD_KNVHM_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_E1COD_KNVHM_STR-MSGFN sy-vline 
WA_E1COD_KNVHM_STR-HITYP sy-vline 
WA_E1COD_KNVHM_STR-KUNNR sy-vline 
WA_E1COD_KNVHM_STR-VKORG sy-vline 
WA_E1COD_KNVHM_STR-VTWEG sy-vline 
WA_E1COD_KNVHM_STR-SPART sy-vline 
WA_E1COD_KNVHM_STR-DATAB sy-vline 
WA_E1COD_KNVHM_STR-DATBI sy-vline 
WA_E1COD_KNVHM_STR-HKUNNR sy-vline 
WA_E1COD_KNVHM_STR-HVKORG sy-vline 
WA_E1COD_KNVHM_STR-HVTWEG sy-vline 
WA_E1COD_KNVHM_STR-HSPART sy-vline 
WA_E1COD_KNVHM_STR-GRPNO sy-vline 
WA_E1COD_KNVHM_STR-BOKRE sy-vline 
WA_E1COD_KNVHM_STR-PRFRE sy-vline 
WA_E1COD_KNVHM_STR-HZUOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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