ABAP Select data from SAP table TNDIA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNDIA
*  INTO TABLE @DATA(IT_TNDIA2).
*--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_TNDIA INDEX 1 INTO DATA(WA_TNDIA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNDIA>-MANDT = 1.
<TNDIA>-EINRI = 1.
<TNDIA>-ENDDT = 1.
<TNDIA>-BEGDT = 1.
<TNDIA>-DOCINP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNDIA-DOCOUT, sy-vline,
  WA_TNDIA-BASKAS, sy-vline,
  WA_TNDIA-BASKAA, sy-vline,
  WA_TNDIA-STAKAS, sy-vline,
  WA_TNDIA-STAKAA, sy-vline,
  WA_TNDIA-EXCLEWS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNDIA 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_TNDIA 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_TNDIA INTO WA_TNDIA.


*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_TNDIA-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNDIA-EINRI.
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_TNDIA_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
ENDDT TYPE STRING,
BEGDT TYPE STRING,
DOCINP TYPE STRING,
DOCOUT TYPE STRING,
BASKAS TYPE STRING,
BASKAA TYPE STRING,
STAKAS TYPE STRING,
STAKAA TYPE STRING,
EXCLEWS TYPE STRING,
EXCLAFS TYPE STRING,
EXCLENS TYPE STRING,
EXCLOPS TYPE STRING,
EXCLTOS TYPE STRING,
EXCLFAS TYPE STRING,
EXCLKHS TYPE STRING,
EXCLEWA TYPE STRING,
EXCLAFA TYPE STRING,
EXCLENA TYPE STRING,
EXCLOPA TYPE STRING,
EXCLTOA TYPE STRING,
EXCLFAA TYPE STRING,
EXCLKHA TYPE STRING,
EWKAS TYPE STRING,
EWKAA TYPE STRING,
DRG_KAS TYPE STRING,
DRG_SEPARAT TYPE STRING,
ENDIA_BILL TYPE STRING,
KHDIA_BILL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNDIA_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_TNDIA_STR-MANDT sy-vline 
WA_TNDIA_STR-EINRI sy-vline 
WA_TNDIA_STR-ENDDT sy-vline 
WA_TNDIA_STR-BEGDT sy-vline 
WA_TNDIA_STR-DOCINP sy-vline 
WA_TNDIA_STR-DOCOUT sy-vline 
WA_TNDIA_STR-BASKAS sy-vline 
WA_TNDIA_STR-BASKAA sy-vline 
WA_TNDIA_STR-STAKAS sy-vline 
WA_TNDIA_STR-STAKAA sy-vline 
WA_TNDIA_STR-EXCLEWS sy-vline 
WA_TNDIA_STR-EXCLAFS sy-vline 
WA_TNDIA_STR-EXCLENS sy-vline 
WA_TNDIA_STR-EXCLOPS sy-vline 
WA_TNDIA_STR-EXCLTOS sy-vline 
WA_TNDIA_STR-EXCLFAS sy-vline 
WA_TNDIA_STR-EXCLKHS sy-vline 
WA_TNDIA_STR-EXCLEWA sy-vline 
WA_TNDIA_STR-EXCLAFA sy-vline 
WA_TNDIA_STR-EXCLENA sy-vline 
WA_TNDIA_STR-EXCLOPA sy-vline 
WA_TNDIA_STR-EXCLTOA sy-vline 
WA_TNDIA_STR-EXCLFAA sy-vline 
WA_TNDIA_STR-EXCLKHA sy-vline 
WA_TNDIA_STR-EWKAS sy-vline 
WA_TNDIA_STR-EWKAA sy-vline 
WA_TNDIA_STR-DRG_KAS sy-vline 
WA_TNDIA_STR-DRG_SEPARAT sy-vline 
WA_TNDIA_STR-ENDIA_BILL sy-vline 
WA_TNDIA_STR-KHDIA_BILL sy-vline      INTO ld_text SEPARATED BY SPACE.

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