ABAP Select data from SAP table T558D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T558D 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 T558D. 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 T558D 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_T558D TYPE STANDARD TABLE OF T558D,
      WA_T558D TYPE T558D,
      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: <T558D> TYPE T558D.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T558D.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T558D
  INTO TABLE IT_T558D.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T558D
*  INTO TABLE @DATA(IT_T558D2).
*--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_T558D INDEX 1 INTO DATA(WA_T558D2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T558D ASSIGNING <T558D>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T558D>-MANDT = 1.
<T558D>-PERNR = 1.
<T558D>-SEQNR = 1.
<T558D>-ABART = 1.
<T558D>-LGART = 1.

ENDLOOP.

LOOP AT IT_T558D INTO WA_T558D.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T558D-APZNR, sy-vline,
  WA_T558D-CNTR1, sy-vline,
  WA_T558D-CNTR2, sy-vline,
  WA_T558D-CNTR3, sy-vline,
  WA_T558D-ALZNR, sy-vline,
  WA_T558D-C1ZNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T558D 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_T558D 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_T558D INTO WA_T558D.


*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_T558D_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
SEQNR TYPE STRING,
ABART TYPE STRING,
LGART TYPE STRING,
APZNR TYPE STRING,
CNTR1 TYPE STRING,
CNTR2 TYPE STRING,
CNTR3 TYPE STRING,
ALZNR TYPE STRING,
C1ZNR TYPE STRING,
BTZNR TYPE STRING,
ABZNR TYPE STRING,
V0TYP TYPE STRING,
V0ZNR TYPE STRING,
ZEINH TYPE STRING,
MOLGA TYPE STRING,
BETPE TYPE STRING,
ANZHL TYPE STRING,
BETRG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T558D_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_T558D_STR-MANDT sy-vline 
WA_T558D_STR-PERNR sy-vline 
WA_T558D_STR-SEQNR sy-vline 
WA_T558D_STR-ABART sy-vline 
WA_T558D_STR-LGART sy-vline 
WA_T558D_STR-APZNR sy-vline 
WA_T558D_STR-CNTR1 sy-vline 
WA_T558D_STR-CNTR2 sy-vline 
WA_T558D_STR-CNTR3 sy-vline 
WA_T558D_STR-ALZNR sy-vline 
WA_T558D_STR-C1ZNR sy-vline 
WA_T558D_STR-BTZNR sy-vline 
WA_T558D_STR-ABZNR sy-vline 
WA_T558D_STR-V0TYP sy-vline 
WA_T558D_STR-V0ZNR sy-vline 
WA_T558D_STR-ZEINH sy-vline 
WA_T558D_STR-MOLGA sy-vline 
WA_T558D_STR-BETPE sy-vline 
WA_T558D_STR-ANZHL sy-vline 
WA_T558D_STR-BETRG sy-vline      INTO ld_text SEPARATED BY SPACE.

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