ABAP Select data from SAP table T512N into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T512N 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 T512N. 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 T512N 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_T512N TYPE STANDARD TABLE OF T512N,
      WA_T512N TYPE T512N,
      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: <T512N> TYPE T512N.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T512N.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T512N
  INTO TABLE IT_T512N.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T512N
*  INTO TABLE @DATA(IT_T512N2).
*--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_T512N INDEX 1 INTO DATA(WA_T512N2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T512N ASSIGNING <T512N>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T512N>-MANDT = 1.
<T512N>-MOLGA = 1.
<T512N>-FORML = 1.
<T512N>-REGEL = 1.
<T512N>-LFDNR = 1.

ENDLOOP.

LOOP AT IT_T512N INTO WA_T512N.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T512N-SCHLW, sy-vline,
  WA_T512N-OFFLG, sy-vline,
  WA_T512N-VGLSO, sy-vline,
  WA_T512N-VGLAT, sy-vline,
  WA_T512N-WERT1, sy-vline,
  WA_T512N-WERT2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T512N 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_T512N 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_T512N INTO WA_T512N.


*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_T512N_STR, 
MANDT TYPE STRING,
MOLGA TYPE STRING,
FORML TYPE STRING,
REGEL TYPE STRING,
LFDNR TYPE STRING,
SCHLW TYPE STRING,
OFFLG TYPE STRING,
VGLSO TYPE STRING,
VGLAT TYPE STRING,
WERT1 TYPE STRING,
WERT2 TYPE STRING,
FOFFS TYPE STRING,
FLEN TYPE STRING,
DRWERT TYPE STRING,
FCONV TYPE STRING,
FOLRE TYPE STRING,
VOFFS TYPE STRING,
VLENG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T512N_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_T512N_STR-MANDT sy-vline 
WA_T512N_STR-MOLGA sy-vline 
WA_T512N_STR-FORML sy-vline 
WA_T512N_STR-REGEL sy-vline 
WA_T512N_STR-LFDNR sy-vline 
WA_T512N_STR-SCHLW sy-vline 
WA_T512N_STR-OFFLG sy-vline 
WA_T512N_STR-VGLSO sy-vline 
WA_T512N_STR-VGLAT sy-vline 
WA_T512N_STR-WERT1 sy-vline 
WA_T512N_STR-WERT2 sy-vline 
WA_T512N_STR-FOFFS sy-vline 
WA_T512N_STR-FLEN sy-vline 
WA_T512N_STR-DRWERT sy-vline 
WA_T512N_STR-FCONV sy-vline 
WA_T512N_STR-FOLRE sy-vline 
WA_T512N_STR-VOFFS sy-vline 
WA_T512N_STR-VLENG sy-vline      INTO ld_text SEPARATED BY SPACE.

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