ABAP Select data from SAP table TDATS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TDATS
*  INTO TABLE @DATA(IT_TDATS2).
*--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_TDATS INDEX 1 INTO DATA(WA_TDATS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TDATS>-DDPROJ = 1.
<TDATS>-DNUM = 1.
<TDATS>-PROGNAME = 1.
<TDATS>-HNUM = 1.
<TDATS>-VIEWTAB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TDATS-TABNAME, sy-vline,
  WA_TDATS-KEY1, sy-vline,
  WA_TDATS-KEY2, sy-vline,
  WA_TDATS-POSNAME, sy-vline,
  WA_TDATS-TEXTTAB, sy-vline,
  WA_TDATS-HEADTAB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TDATS 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_TDATS 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_TDATS INTO WA_TDATS.


*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_TDATS_STR, 
DDPROJ TYPE STRING,
DNUM TYPE STRING,
PROGNAME TYPE STRING,
HNUM TYPE STRING,
VIEWTAB TYPE STRING,
TABNAME TYPE STRING,
KEY1 TYPE STRING,
KEY2 TYPE STRING,
POSNAME TYPE STRING,
TEXTTAB TYPE STRING,
HEADTAB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TDATS_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_TDATS_STR-DDPROJ sy-vline 
WA_TDATS_STR-DNUM sy-vline 
WA_TDATS_STR-PROGNAME sy-vline 
WA_TDATS_STR-HNUM sy-vline 
WA_TDATS_STR-VIEWTAB sy-vline 
WA_TDATS_STR-TABNAME sy-vline 
WA_TDATS_STR-KEY1 sy-vline 
WA_TDATS_STR-KEY2 sy-vline 
WA_TDATS_STR-POSNAME sy-vline 
WA_TDATS_STR-TEXTTAB sy-vline 
WA_TDATS_STR-HEADTAB sy-vline      INTO ld_text SEPARATED BY SPACE.

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