ABAP Select data from SAP table T823K into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T823K 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 T823K. 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 T823K 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_T823K TYPE STANDARD TABLE OF T823K,
      WA_T823K TYPE T823K,
      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: <T823K> TYPE T823K.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T823K.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T823K
  INTO TABLE IT_T823K.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T823K
*  INTO TABLE @DATA(IT_T823K2).
*--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_T823K INDEX 1 INTO DATA(WA_T823K2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T823K ASSIGNING <T823K>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T823K>-MANDT = 1.
<T823K>-TAB = 1.
<T823K>-UMGRP = 1.
<T823K>-UMWRT = 1.
<T823K>-GJAHR = 1.

ENDLOOP.

LOOP AT IT_T823K INTO WA_T823K.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T823K-VERSN, sy-vline,
  WA_T823K-FIELD, sy-vline,
  WA_T823K-SETNAME, sy-vline,
  WA_T823K-VALMIN, sy-vline,
  WA_T823K-VALMAX, sy-vline,
  WA_T823K-SETID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T823K 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_T823K 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_T823K INTO WA_T823K.


*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_T823K-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T823K-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VERSN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T823K-VERSN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T823K-VERSN.
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_T823K_STR, 
MANDT TYPE STRING,
TAB TYPE STRING,
UMGRP TYPE STRING,
UMWRT TYPE STRING,
GJAHR TYPE STRING,
VERSN TYPE STRING,
FIELD TYPE STRING,
SETNAME TYPE STRING,
VALMIN TYPE STRING,
VALMAX TYPE STRING,
SETID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T823K_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_T823K_STR-MANDT sy-vline 
WA_T823K_STR-TAB sy-vline 
WA_T823K_STR-UMGRP sy-vline 
WA_T823K_STR-UMWRT sy-vline 
WA_T823K_STR-GJAHR sy-vline 
WA_T823K_STR-VERSN sy-vline 
WA_T823K_STR-FIELD sy-vline 
WA_T823K_STR-SETNAME sy-vline 
WA_T823K_STR-VALMIN sy-vline 
WA_T823K_STR-VALMAX sy-vline 
WA_T823K_STR-SETID sy-vline      INTO ld_text SEPARATED BY SPACE.

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