ABAP Select data from SAP table TRDC_DATES into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TRDC_DATES
*  INTO TABLE @DATA(IT_TRDC_DATES2).
*--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_TRDC_DATES INDEX 1 INTO DATA(WA_TRDC_DATES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TRDC_DATES>-SKONDGRP = 1.
<TRDC_DATES>-DBERVON = 1.
<TRDC_DATES>-SEXCLVON = 1.
<TRDC_DATES>-SULTVON = 1.
<TRDC_DATES>-DBERBIS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TRDC_DATES-SINCLBIS, sy-vline,
  WA_TRDC_DATES-SULTBIS, sy-vline,
  WA_TRDC_DATES-SZBMETH, sy-vline,
  WA_TRDC_DATES-STGMETH, sy-vline,
  WA_TRDC_DATES-STGBASIS, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_TRDC_DATES 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_TRDC_DATES 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_TRDC_DATES INTO WA_TRDC_DATES.


*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_TRDC_DATES_STR, 
SKONDGRP TYPE STRING,
DBERVON TYPE STRING,
SEXCLVON TYPE STRING,
SULTVON TYPE STRING,
DBERBIS TYPE STRING,
SINCLBIS TYPE STRING,
SULTBIS TYPE STRING,
SZBMETH TYPE STRING,
STGMETH TYPE STRING,
STGBASIS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TRDC_DATES_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_TRDC_DATES_STR-SKONDGRP sy-vline 
WA_TRDC_DATES_STR-DBERVON sy-vline 
WA_TRDC_DATES_STR-SEXCLVON sy-vline 
WA_TRDC_DATES_STR-SULTVON sy-vline 
WA_TRDC_DATES_STR-DBERBIS sy-vline 
WA_TRDC_DATES_STR-SINCLBIS sy-vline 
WA_TRDC_DATES_STR-SULTBIS sy-vline 
WA_TRDC_DATES_STR-SZBMETH sy-vline 
WA_TRDC_DATES_STR-STGMETH sy-vline 
WA_TRDC_DATES_STR-STGBASIS sy-vline      INTO ld_text SEPARATED BY SPACE.

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