ABAP Select data from SAP table TNWATKBGEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNWATKBGEN
*  INTO TABLE @DATA(IT_TNWATKBGEN2).
*--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_TNWATKBGEN INDEX 1 INTO DATA(WA_TNWATKBGEN2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNWATKBGEN-SZKZ, sy-vline,
  WA_TNWATKBGEN-MGART, sy-vline,
  WA_TNWATKBGEN-VTRTY, sy-vline,
  WA_TNWATKBGEN-BEKAT, sy-vline,
  WA_TNWATKBGEN-KZGEBURT, sy-vline,
  WA_TNWATKBGEN-BEGLT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNWATKBGEN 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_TNWATKBGEN 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_TNWATKBGEN INTO WA_TNWATKBGEN.


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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field LEIST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNWATKBGEN-LEIST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNWATKBGEN-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_TNWATKBGEN_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,
KZGEBURT TYPE STRING,
BEGLT TYPE STRING,
AUFART TYPE STRING,
ORGPF TYPE STRING,
BEGDT TYPE STRING,
LKAT TYPE STRING,
LEIST TYPE STRING,
KZINCL TYPE STRING,
KZEXCL TYPE STRING,
ENDDT TYPE STRING,
ABKZGEB TYPE STRING,
ANZTGGEB TYPE STRING,
ALGRTY TYPE STRING,
ALTGR TYPE STRING,
ALTAUF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNWATKBGEN_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_TNWATKBGEN_STR-MANDT sy-vline 
WA_TNWATKBGEN_STR-EINRI sy-vline 
WA_TNWATKBGEN_STR-RART sy-vline 
WA_TNWATKBGEN_STR-KTRART sy-vline 
WA_TNWATKBGEN_STR-KOSTR sy-vline 
WA_TNWATKBGEN_STR-SZKZ sy-vline 
WA_TNWATKBGEN_STR-MGART sy-vline 
WA_TNWATKBGEN_STR-VTRTY sy-vline 
WA_TNWATKBGEN_STR-BEKAT sy-vline 
WA_TNWATKBGEN_STR-KZGEBURT sy-vline 
WA_TNWATKBGEN_STR-BEGLT sy-vline 
WA_TNWATKBGEN_STR-AUFART sy-vline 
WA_TNWATKBGEN_STR-ORGPF sy-vline 
WA_TNWATKBGEN_STR-BEGDT sy-vline 
WA_TNWATKBGEN_STR-LKAT sy-vline 
WA_TNWATKBGEN_STR-LEIST sy-vline 
WA_TNWATKBGEN_STR-KZINCL sy-vline 
WA_TNWATKBGEN_STR-KZEXCL sy-vline 
WA_TNWATKBGEN_STR-ENDDT sy-vline 
WA_TNWATKBGEN_STR-ABKZGEB sy-vline 
WA_TNWATKBGEN_STR-ANZTGGEB sy-vline 
WA_TNWATKBGEN_STR-ALGRTY sy-vline 
WA_TNWATKBGEN_STR-ALTGR sy-vline 
WA_TNWATKBGEN_STR-ALTAUF sy-vline      INTO ld_text SEPARATED BY SPACE.

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