ABAP Select data from SAP table T53GW into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T53GW 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 T53GW. 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 T53GW 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_T53GW TYPE STANDARD TABLE OF T53GW,
      WA_T53GW TYPE T53GW,
      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: <T53GW> TYPE T53GW.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T53GW.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T53GW
  INTO TABLE IT_T53GW.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T53GW
*  INTO TABLE @DATA(IT_T53GW2).
*--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_T53GW INDEX 1 INTO DATA(WA_T53GW2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T53GW ASSIGNING <T53GW>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T53GW>-MANDT = 1.
<T53GW>-MOLGA = 1.
<T53GW>-JURIS = 1.
<T53GW>-GCATE = 1.
<T53GW>-DBCOD = 1.

ENDLOOP.

LOOP AT IT_T53GW INTO WA_T53GW.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T53GW-CRCOD, sy-vline,
  WA_T53GW-ENDDA, sy-vline,
  WA_T53GW-BEGDA, sy-vline,
  WA_T53GW-BAMOD, sy-vline,
  WA_T53GW-GRMOD, sy-vline,
  WA_T53GW-NEMOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T53GW 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_T53GW 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_T53GW INTO WA_T53GW.


*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_T53GW_STR, 
MANDT TYPE STRING,
MOLGA TYPE STRING,
JURIS TYPE STRING,
GCATE TYPE STRING,
DBCOD TYPE STRING,
CRCOD TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
BAMOD TYPE STRING,
GRMOD TYPE STRING,
NEMOD TYPE STRING,
NXMOD TYPE STRING,
TNMOD TYPE STRING,
CRSPY TYPE STRING,
CRARR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T53GW_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_T53GW_STR-MANDT sy-vline 
WA_T53GW_STR-MOLGA sy-vline 
WA_T53GW_STR-JURIS sy-vline 
WA_T53GW_STR-GCATE sy-vline 
WA_T53GW_STR-DBCOD sy-vline 
WA_T53GW_STR-CRCOD sy-vline 
WA_T53GW_STR-ENDDA sy-vline 
WA_T53GW_STR-BEGDA sy-vline 
WA_T53GW_STR-BAMOD sy-vline 
WA_T53GW_STR-GRMOD sy-vline 
WA_T53GW_STR-NEMOD sy-vline 
WA_T53GW_STR-NXMOD sy-vline 
WA_T53GW_STR-TNMOD sy-vline 
WA_T53GW_STR-CRSPY sy-vline 
WA_T53GW_STR-CRARR sy-vline      INTO ld_text SEPARATED BY SPACE.

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