ABAP Select data from SAP table T554A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T554A 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 T554A. 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 T554A 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_T554A TYPE STANDARD TABLE OF T554A,
      WA_T554A TYPE T554A,
      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: <T554A> TYPE T554A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T554A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T554A
  INTO TABLE IT_T554A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T554A
*  INTO TABLE @DATA(IT_T554A2).
*--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_T554A INDEX 1 INTO DATA(WA_T554A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T554A ASSIGNING <T554A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T554A>-MANDT = 1.
<T554A>-MOLGA = 1.
<T554A>-KLBEW = 1.
<T554A>-MOZKO = 1.
<T554A>-MOPGK = 1.

ENDLOOP.

LOOP AT IT_T554A INTO WA_T554A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T554A-KTART, sy-vline,
  WA_T554A-SEQNO, sy-vline,
  WA_T554A-ENDDA, sy-vline,
  WA_T554A-BEGDA, sy-vline,
  WA_T554A-COMPR, sy-vline,
  WA_T554A-DIFFR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T554A 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_T554A 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_T554A INTO WA_T554A.


*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 CYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_T554A-CYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T554A-CYEAR.
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_T554A_STR, 
MANDT TYPE STRING,
MOLGA TYPE STRING,
KLBEW TYPE STRING,
MOZKO TYPE STRING,
MOPGK TYPE STRING,
KTART TYPE STRING,
SEQNO TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
COMPR TYPE STRING,
DIFFR TYPE STRING,
CYEAR TYPE STRING,
KLOUT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T554A_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_T554A_STR-MANDT sy-vline 
WA_T554A_STR-MOLGA sy-vline 
WA_T554A_STR-KLBEW sy-vline 
WA_T554A_STR-MOZKO sy-vline 
WA_T554A_STR-MOPGK sy-vline 
WA_T554A_STR-KTART sy-vline 
WA_T554A_STR-SEQNO sy-vline 
WA_T554A_STR-ENDDA sy-vline 
WA_T554A_STR-BEGDA sy-vline 
WA_T554A_STR-COMPR sy-vline 
WA_T554A_STR-DIFFR sy-vline 
WA_T554A_STR-CYEAR sy-vline 
WA_T554A_STR-KLOUT sy-vline      INTO ld_text SEPARATED BY SPACE.

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