ABAP Select data from SAP table T884M into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T884M 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 T884M. 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 T884M 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_T884M TYPE STANDARD TABLE OF T884M,
      WA_T884M TYPE T884M,
      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: <T884M> TYPE T884M.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T884M.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T884M
  INTO TABLE IT_T884M.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T884M
*  INTO TABLE @DATA(IT_T884M2).
*--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_T884M INDEX 1 INTO DATA(WA_T884M2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T884M ASSIGNING <T884M>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T884M>-MANDT = 1.
<T884M>-WAEGR = 1.
<T884M>-PRFIN = 1.
<T884M>-STAIN = 1.
<T884M>-TAB = 1.

ENDLOOP.

LOOP AT IT_T884M INTO WA_T884M.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T884M-USEWU, sy-vline,
  WA_T884M-REFERI, sy-vline,
  WA_T884M-ITCLG, sy-vline,
  WA_T884M-SITYP, sy-vline,
  WA_T884M-DOCPO, sy-vline,
  WA_T884M-DELTA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T884M 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_T884M 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_T884M INTO WA_T884M.


*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 ALPHA, internal->external for field DOCTY_LC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T884M-DOCTY_LC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T884M-DOCTY_LC.
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_T884M_STR, 
MANDT TYPE STRING,
WAEGR TYPE STRING,
PRFIN TYPE STRING,
STAIN TYPE STRING,
TAB TYPE STRING,
USEWU TYPE STRING,
REFERI TYPE STRING,
ITCLG TYPE STRING,
SITYP TYPE STRING,
DOCPO TYPE STRING,
DELTA TYPE STRING,
DOCTY_LC TYPE STRING,
DOCTY_SL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T884M_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_T884M_STR-MANDT sy-vline 
WA_T884M_STR-WAEGR sy-vline 
WA_T884M_STR-PRFIN sy-vline 
WA_T884M_STR-STAIN sy-vline 
WA_T884M_STR-TAB sy-vline 
WA_T884M_STR-USEWU sy-vline 
WA_T884M_STR-REFERI sy-vline 
WA_T884M_STR-ITCLG sy-vline 
WA_T884M_STR-SITYP sy-vline 
WA_T884M_STR-DOCPO sy-vline 
WA_T884M_STR-DELTA sy-vline 
WA_T884M_STR-DOCTY_LC sy-vline 
WA_T884M_STR-DOCTY_SL sy-vline      INTO ld_text SEPARATED BY SPACE.

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