ABAP Select data from SAP table T556A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T556A 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 T556A. 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 T556A 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_T556A TYPE STANDARD TABLE OF T556A,
      WA_T556A TYPE T556A,
      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: <T556A> TYPE T556A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T556A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T556A
  INTO TABLE IT_T556A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T556A
*  INTO TABLE @DATA(IT_T556A2).
*--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_T556A INDEX 1 INTO DATA(WA_T556A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T556A ASSIGNING <T556A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T556A>-MANDT = 1.
<T556A>-MOPGK = 1.
<T556A>-MOZKO = 1.
<T556A>-KTART = 1.
<T556A>-ENDDA = 1.

ENDLOOP.

LOOP AT IT_T556A INTO WA_T556A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T556A-BEGDA, sy-vline,
  WA_T556A-ZEINH, sy-vline,
  WA_T556A-BEGUZ, sy-vline,
  WA_T556A-ENDUZ, sy-vline,
  WA_T556A-URLDT, sy-vline,
  WA_T556A-INAUT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T556A 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_T556A 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_T556A INTO WA_T556A.


*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_T556A_STR, 
MANDT TYPE STRING,
MOPGK TYPE STRING,
MOZKO TYPE STRING,
KTART TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
ZEINH TYPE STRING,
BEGUZ TYPE STRING,
ENDUZ TYPE STRING,
URLDT TYPE STRING,
INAUT TYPE STRING,
KLZBI TYPE STRING,
URLRN TYPE STRING,
QTNEG TYPE STRING,
NOCOMPENSATION TYPE STRING,
QUOTA_TYPE TYPE STRING,
QUOTA_SHARED_CE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T556A_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_T556A_STR-MANDT sy-vline 
WA_T556A_STR-MOPGK sy-vline 
WA_T556A_STR-MOZKO sy-vline 
WA_T556A_STR-KTART sy-vline 
WA_T556A_STR-ENDDA sy-vline 
WA_T556A_STR-BEGDA sy-vline 
WA_T556A_STR-ZEINH sy-vline 
WA_T556A_STR-BEGUZ sy-vline 
WA_T556A_STR-ENDUZ sy-vline 
WA_T556A_STR-URLDT sy-vline 
WA_T556A_STR-INAUT sy-vline 
WA_T556A_STR-KLZBI sy-vline 
WA_T556A_STR-URLRN sy-vline 
WA_T556A_STR-QTNEG sy-vline 
WA_T556A_STR-NOCOMPENSATION sy-vline 
WA_T556A_STR-QUOTA_TYPE sy-vline 
WA_T556A_STR-QUOTA_SHARED_CE sy-vline      INTO ld_text SEPARATED BY SPACE.

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