ABAP Select data from SAP table T559D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T559D 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 T559D. 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 T559D 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_T559D TYPE STANDARD TABLE OF T559D,
      WA_T559D TYPE T559D,
      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: <T559D> TYPE T559D.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T559D.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T559D
  INTO TABLE IT_T559D.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T559D
*  INTO TABLE @DATA(IT_T559D2).
*--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_T559D INDEX 1 INTO DATA(WA_T559D2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T559D ASSIGNING <T559D>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T559D>-MANDT = 1.
<T559D>-MOPGK = 1.
<T559D>-MOZKO = 1.
<T559D>-QTYPE = 1.
<T559D>-VBETP = 1.

ENDLOOP.

LOOP AT IT_T559D INTO WA_T559D.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T559D-VBEPP, sy-vline,
  WA_T559D-VBEDT, sy-vline,
  WA_T559D-VBEBE, sy-vline,
  WA_T559D-VBERV, sy-vline,
  WA_T559D-VBERU, sy-vline,
  WA_T559D-VENTP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T559D 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_T559D 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_T559D INTO WA_T559D.


*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_T559D_STR, 
MANDT TYPE STRING,
MOPGK TYPE STRING,
MOZKO TYPE STRING,
QTYPE TYPE STRING,
VBETP TYPE STRING,
VBEPP TYPE STRING,
VBEDT TYPE STRING,
VBEBE TYPE STRING,
VBERV TYPE STRING,
VBERU TYPE STRING,
VENTP TYPE STRING,
VENPP TYPE STRING,
VENDT TYPE STRING,
VENBE TYPE STRING,
VENRV TYPE STRING,
VENRU TYPE STRING,
DBEDL TYPE STRING,
DBEBE TYPE STRING,
DBERV TYPE STRING,
DBERU TYPE STRING,
DENDL TYPE STRING,
DENBE TYPE STRING,
DENRV TYPE STRING,
DENRU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T559D_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_T559D_STR-MANDT sy-vline 
WA_T559D_STR-MOPGK sy-vline 
WA_T559D_STR-MOZKO sy-vline 
WA_T559D_STR-QTYPE sy-vline 
WA_T559D_STR-VBETP sy-vline 
WA_T559D_STR-VBEPP sy-vline 
WA_T559D_STR-VBEDT sy-vline 
WA_T559D_STR-VBEBE sy-vline 
WA_T559D_STR-VBERV sy-vline 
WA_T559D_STR-VBERU sy-vline 
WA_T559D_STR-VENTP sy-vline 
WA_T559D_STR-VENPP sy-vline 
WA_T559D_STR-VENDT sy-vline 
WA_T559D_STR-VENBE sy-vline 
WA_T559D_STR-VENRV sy-vline 
WA_T559D_STR-VENRU sy-vline 
WA_T559D_STR-DBEDL sy-vline 
WA_T559D_STR-DBEBE sy-vline 
WA_T559D_STR-DBERV sy-vline 
WA_T559D_STR-DBERU sy-vline 
WA_T559D_STR-DENDL sy-vline 
WA_T559D_STR-DENBE sy-vline 
WA_T559D_STR-DENRV sy-vline 
WA_T559D_STR-DENRU sy-vline      INTO ld_text SEPARATED BY SPACE.

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