ABAP Select data from SAP table T823D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T823D 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 T823D. 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 T823D 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_T823D TYPE STANDARD TABLE OF T823D,
      WA_T823D TYPE T823D,
      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: <T823D> TYPE T823D.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T823D.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T823D
  INTO TABLE IT_T823D.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T823D
*  INTO TABLE @DATA(IT_T823D2).
*--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_T823D INDEX 1 INTO DATA(WA_T823D2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T823D ASSIGNING <T823D>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T823D>-MANDT = 1.
<T823D>-TAB = 1.
<T823D>-UMGRP = 1.
<T823D>-UMWRT = 1.
<T823D>-GJAHR = 1.

ENDLOOP.

LOOP AT IT_T823D INTO WA_T823D.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T823D-VERSN, sy-vline,
  WA_T823D-PERIO, sy-vline,
  WA_T823D-DPOS, sy-vline,
  WA_T823D-DOCNR, sy-vline,
  WA_T823D-ADATE, sy-vline,
  WA_T823D-RDOC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T823D 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_T823D 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_T823D INTO WA_T823D.


*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 GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_T823D-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T823D-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VERSN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T823D-VERSN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T823D-VERSN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DOCNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T823D-DOCNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T823D-DOCNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RDOC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T823D-RDOC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T823D-RDOC.
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_T823D_STR, 
MANDT TYPE STRING,
TAB TYPE STRING,
UMGRP TYPE STRING,
UMWRT TYPE STRING,
GJAHR TYPE STRING,
VERSN TYPE STRING,
PERIO TYPE STRING,
DPOS TYPE STRING,
DOCNR TYPE STRING,
ADATE TYPE STRING,
RDOC TYPE STRING,
RDATE TYPE STRING,
REVERSED TYPE STRING,
ETAB TYPE STRING,
NKROBJ TYPE STRING,
NKRSUB TYPE STRING,
NKRNNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T823D_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_T823D_STR-MANDT sy-vline 
WA_T823D_STR-TAB sy-vline 
WA_T823D_STR-UMGRP sy-vline 
WA_T823D_STR-UMWRT sy-vline 
WA_T823D_STR-GJAHR sy-vline 
WA_T823D_STR-VERSN sy-vline 
WA_T823D_STR-PERIO sy-vline 
WA_T823D_STR-DPOS sy-vline 
WA_T823D_STR-DOCNR sy-vline 
WA_T823D_STR-ADATE sy-vline 
WA_T823D_STR-RDOC sy-vline 
WA_T823D_STR-RDATE sy-vline 
WA_T823D_STR-REVERSED sy-vline 
WA_T823D_STR-ETAB sy-vline 
WA_T823D_STR-NKROBJ sy-vline 
WA_T823D_STR-NKRSUB sy-vline 
WA_T823D_STR-NKRNNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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