ABAP Select data from SAP table TNWATKBDIA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNWATKBDIA
*  INTO TABLE @DATA(IT_TNWATKBDIA2).
*--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_TNWATKBDIA INDEX 1 INTO DATA(WA_TNWATKBDIA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNWATKBDIA>-MANDT = 1.
<TNWATKBDIA>-EINRI = 1.
<TNWATKBDIA>-RART = 1.
<TNWATKBDIA>-KTRART = 1.
<TNWATKBDIA>-KOSTR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNWATKBDIA-SZKZ, sy-vline,
  WA_TNWATKBDIA-MGART, sy-vline,
  WA_TNWATKBDIA-VTRTY, sy-vline,
  WA_TNWATKBDIA-BEKAT, sy-vline,
  WA_TNWATKBDIA-AUFART, sy-vline,
  WA_TNWATKBDIA-LKAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNWATKBDIA 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_TNWATKBDIA 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_TNWATKBDIA INTO WA_TNWATKBDIA.


*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_TNWATKBDIA-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNWATKBDIA-EINRI.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field LEIST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNWATKBDIA-LEIST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNWATKBDIA-LEIST.
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_TNWATKBDIA_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
RART TYPE STRING,
KTRART TYPE STRING,
KOSTR TYPE STRING,
SZKZ TYPE STRING,
MGART TYPE STRING,
VTRTY TYPE STRING,
BEKAT TYPE STRING,
AUFART TYPE STRING,
LKAT TYPE STRING,
LEIST TYPE STRING,
DKAT TYPE STRING,
DKEY TYPE STRING,
CLFIND TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
EWDIA TYPE STRING,
BHDIA TYPE STRING,
AFDIA TYPE STRING,
ENDIA TYPE STRING,
FHDIA TYPE STRING,
KHDIA TYPE STRING,
OPDIA TYPE STRING,
KZGEBURT TYPE STRING,
SSW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNWATKBDIA_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_TNWATKBDIA_STR-MANDT sy-vline 
WA_TNWATKBDIA_STR-EINRI sy-vline 
WA_TNWATKBDIA_STR-RART sy-vline 
WA_TNWATKBDIA_STR-KTRART sy-vline 
WA_TNWATKBDIA_STR-KOSTR sy-vline 
WA_TNWATKBDIA_STR-SZKZ sy-vline 
WA_TNWATKBDIA_STR-MGART sy-vline 
WA_TNWATKBDIA_STR-VTRTY sy-vline 
WA_TNWATKBDIA_STR-BEKAT sy-vline 
WA_TNWATKBDIA_STR-AUFART sy-vline 
WA_TNWATKBDIA_STR-LKAT sy-vline 
WA_TNWATKBDIA_STR-LEIST sy-vline 
WA_TNWATKBDIA_STR-DKAT sy-vline 
WA_TNWATKBDIA_STR-DKEY sy-vline 
WA_TNWATKBDIA_STR-CLFIND sy-vline 
WA_TNWATKBDIA_STR-BEGDT sy-vline 
WA_TNWATKBDIA_STR-ENDDT sy-vline 
WA_TNWATKBDIA_STR-EWDIA sy-vline 
WA_TNWATKBDIA_STR-BHDIA sy-vline 
WA_TNWATKBDIA_STR-AFDIA sy-vline 
WA_TNWATKBDIA_STR-ENDIA sy-vline 
WA_TNWATKBDIA_STR-FHDIA sy-vline 
WA_TNWATKBDIA_STR-KHDIA sy-vline 
WA_TNWATKBDIA_STR-OPDIA sy-vline 
WA_TNWATKBDIA_STR-KZGEBURT sy-vline 
WA_TNWATKBDIA_STR-SSW sy-vline      INTO ld_text SEPARATED BY SPACE.

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