ABAP Select data from SAP table T550A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T550A 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 T550A. 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 T550A 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_T550A TYPE STANDARD TABLE OF T550A,
      WA_T550A TYPE T550A,
      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: <T550A> TYPE T550A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T550A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T550A
  INTO TABLE IT_T550A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T550A
*  INTO TABLE @DATA(IT_T550A2).
*--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_T550A INDEX 1 INTO DATA(WA_T550A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T550A ASSIGNING <T550A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T550A>-MANDT = 1.
<T550A>-MOTPR = 1.
<T550A>-TPROG = 1.
<T550A>-VARIA = 1.
<T550A>-SEQNO = 1.

ENDLOOP.

LOOP AT IT_T550A INTO WA_T550A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T550A-ENDDA, sy-vline,
  WA_T550A-BEGDA, sy-vline,
  WA_T550A-REGEL, sy-vline,
  WA_T550A-TPKLA, sy-vline,
  WA_T550A-SOLLZ, sy-vline,
  WA_T550A-SOMAX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T550A 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_T550A 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_T550A INTO WA_T550A.


*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_T550A_STR, 
MANDT TYPE STRING,
MOTPR TYPE STRING,
TPROG TYPE STRING,
VARIA TYPE STRING,
SEQNO TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
REGEL TYPE STRING,
TPKLA TYPE STRING,
SOLLZ TYPE STRING,
SOMAX TYPE STRING,
SOMIN TYPE STRING,
VORHO TYPE STRING,
NOBEG TYPE STRING,
NOEND TYPE STRING,
BTBEG TYPE STRING,
SOBEG TYPE STRING,
BTEND TYPE STRING,
K1BEG TYPE STRING,
K1END TYPE STRING,
K2BEG TYPE STRING,
K2END TYPE STRING,
ETBEG TYPE STRING,
SOEND TYPE STRING,
ETEND TYPE STRING,
ZUSTD TYPE STRING,
PAMOD TYPE STRING,
RMEHR TYPE STRING,
RKERN TYPE STRING,
RKEPA TYPE STRING,
STABY TYPE STRING,
OVPOS TYPE STRING,
START_PREV_DAY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T550A_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_T550A_STR-MANDT sy-vline 
WA_T550A_STR-MOTPR sy-vline 
WA_T550A_STR-TPROG sy-vline 
WA_T550A_STR-VARIA sy-vline 
WA_T550A_STR-SEQNO sy-vline 
WA_T550A_STR-ENDDA sy-vline 
WA_T550A_STR-BEGDA sy-vline 
WA_T550A_STR-REGEL sy-vline 
WA_T550A_STR-TPKLA sy-vline 
WA_T550A_STR-SOLLZ sy-vline 
WA_T550A_STR-SOMAX sy-vline 
WA_T550A_STR-SOMIN sy-vline 
WA_T550A_STR-VORHO sy-vline 
WA_T550A_STR-NOBEG sy-vline 
WA_T550A_STR-NOEND sy-vline 
WA_T550A_STR-BTBEG sy-vline 
WA_T550A_STR-SOBEG sy-vline 
WA_T550A_STR-BTEND sy-vline 
WA_T550A_STR-K1BEG sy-vline 
WA_T550A_STR-K1END sy-vline 
WA_T550A_STR-K2BEG sy-vline 
WA_T550A_STR-K2END sy-vline 
WA_T550A_STR-ETBEG sy-vline 
WA_T550A_STR-SOEND sy-vline 
WA_T550A_STR-ETEND sy-vline 
WA_T550A_STR-ZUSTD sy-vline 
WA_T550A_STR-PAMOD sy-vline 
WA_T550A_STR-RMEHR sy-vline 
WA_T550A_STR-RKERN sy-vline 
WA_T550A_STR-RKEPA sy-vline 
WA_T550A_STR-STABY sy-vline 
WA_T550A_STR-OVPOS sy-vline 
WA_T550A_STR-START_PREV_DAY sy-vline      INTO ld_text SEPARATED BY SPACE.

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