ABAP Select data from SAP table TNWCH_EDIKTR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNWCH_EDIKTR
*  INTO TABLE @DATA(IT_TNWCH_EDIKTR2).
*--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_TNWCH_EDIKTR INDEX 1 INTO DATA(WA_TNWCH_EDIKTR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNWCH_EDIKTR>-MANDT = 1.
<TNWCH_EDIKTR>-EINRI = 1.
<TNWCH_EDIKTR>-KTART = 1.
<TNWCH_EDIKTR>-KOSTR = 1.
<TNWCH_EDIKTR>-FALAR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNWCH_EDIKTR-DRG_CASE, sy-vline,
  WA_TNWCH_EDIKTR-BEGDT, sy-vline,
  WA_TNWCH_EDIKTR-ENDDT, sy-vline,
  WA_TNWCH_EDIKTR-EDI, sy-vline,
  WA_TNWCH_EDIKTR-PROD, sy-vline,
  WA_TNWCH_EDIKTR-DRUCK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNWCH_EDIKTR 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_TNWCH_EDIKTR 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_TNWCH_EDIKTR INTO WA_TNWCH_EDIKTR.


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

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

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNWCH_EDIKTR-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNWCH_EDIKTR-KOSTR.
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_TNWCH_EDIKTR_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
KTART TYPE STRING,
KOSTR TYPE STRING,
FALAR TYPE STRING,
DRG_CASE TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
EDI TYPE STRING,
PROD TYPE STRING,
DRUCK TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
ERTIM TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
UPTIM TYPE STRING,
NULLR TYPE STRING,
DAS301 TYPE STRING,
XMLIN_VERSION TYPE STRING,
XMLIN_OPTIONEN TYPE STRING,
KOGU_EDI TYPE STRING,
KOGU_VERSION TYPE STRING,
KOGU_PROD TYPE STRING,
KOGU_DRUCK TYPE STRING,
MCD_HOLD TYPE STRING,
EXTFU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNWCH_EDIKTR_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_TNWCH_EDIKTR_STR-MANDT sy-vline 
WA_TNWCH_EDIKTR_STR-EINRI sy-vline 
WA_TNWCH_EDIKTR_STR-KTART sy-vline 
WA_TNWCH_EDIKTR_STR-KOSTR sy-vline 
WA_TNWCH_EDIKTR_STR-FALAR sy-vline 
WA_TNWCH_EDIKTR_STR-DRG_CASE sy-vline 
WA_TNWCH_EDIKTR_STR-BEGDT sy-vline 
WA_TNWCH_EDIKTR_STR-ENDDT sy-vline 
WA_TNWCH_EDIKTR_STR-EDI sy-vline 
WA_TNWCH_EDIKTR_STR-PROD sy-vline 
WA_TNWCH_EDIKTR_STR-DRUCK sy-vline 
WA_TNWCH_EDIKTR_STR-ERDAT sy-vline 
WA_TNWCH_EDIKTR_STR-ERUSR sy-vline 
WA_TNWCH_EDIKTR_STR-ERTIM sy-vline 
WA_TNWCH_EDIKTR_STR-UPDAT sy-vline 
WA_TNWCH_EDIKTR_STR-UPUSR sy-vline 
WA_TNWCH_EDIKTR_STR-UPTIM sy-vline 
WA_TNWCH_EDIKTR_STR-NULLR sy-vline 
WA_TNWCH_EDIKTR_STR-DAS301 sy-vline 
WA_TNWCH_EDIKTR_STR-XMLIN_VERSION sy-vline 
WA_TNWCH_EDIKTR_STR-XMLIN_OPTIONEN sy-vline 
WA_TNWCH_EDIKTR_STR-KOGU_EDI sy-vline 
WA_TNWCH_EDIKTR_STR-KOGU_VERSION sy-vline 
WA_TNWCH_EDIKTR_STR-KOGU_PROD sy-vline 
WA_TNWCH_EDIKTR_STR-KOGU_DRUCK sy-vline 
WA_TNWCH_EDIKTR_STR-MCD_HOLD sy-vline 
WA_TNWCH_EDIKTR_STR-EXTFU sy-vline      INTO ld_text SEPARATED BY SPACE.

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