ABAP Select data from SAP table T554M into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T554M 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 T554M. 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 T554M 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_T554M TYPE STANDARD TABLE OF T554M,
      WA_T554M TYPE T554M,
      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: <T554M> TYPE T554M.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T554M.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T554M
  INTO TABLE IT_T554M.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T554M
*  INTO TABLE @DATA(IT_T554M2).
*--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_T554M INDEX 1 INTO DATA(WA_T554M2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T554M ASSIGNING <T554M>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T554M>-MANDT = 1.
<T554M>-MOABW = 1.
<T554M>-AWART = 1.
<T554M>-GBART = 1.
<T554M>-ENDDA = 1.

ENDLOOP.

LOOP AT IT_T554M INTO WA_T554M.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T554M-BEGDA, sy-vline,
  WA_T554M-FVMIN, sy-vline,
  WA_T554M-FVMAX, sy-vline,
  WA_T554M-FNMIN, sy-vline,
  WA_T554M-FNMAX, sy-vline,
  WA_T554M-ZEIN1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T554M 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_T554M 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_T554M INTO WA_T554M.


*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_T554M_STR, 
MANDT TYPE STRING,
MOABW TYPE STRING,
AWART TYPE STRING,
GBART TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
FVMIN TYPE STRING,
FVMAX TYPE STRING,
FNMIN TYPE STRING,
FNMAX TYPE STRING,
ZEIN1 TYPE STRING,
DAUMA TYPE STRING,
DAUMI TYPE STRING,
ZEIN2 TYPE STRING,
GEWHR TYPE STRING,
ZEIN3 TYPE STRING,
ANTRF TYPE STRING,
ZEIN4 TYPE STRING,
GESCH TYPE STRING,
ENTMR TYPE STRING,
FLAG1 TYPE STRING,
FLAG2 TYPE STRING,
REAK1 TYPE STRING,
REAK2 TYPE STRING,
REAK3 TYPE STRING,
REAK4 TYPE STRING,
ZEIN5 TYPE STRING,
AUSW1 TYPE STRING,
AUSW2 TYPE STRING,
AUSW3 TYPE STRING,
AUSW4 TYPE STRING,
SNAME TYPE STRING,
VORGN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T554M_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_T554M_STR-MANDT sy-vline 
WA_T554M_STR-MOABW sy-vline 
WA_T554M_STR-AWART sy-vline 
WA_T554M_STR-GBART sy-vline 
WA_T554M_STR-ENDDA sy-vline 
WA_T554M_STR-BEGDA sy-vline 
WA_T554M_STR-FVMIN sy-vline 
WA_T554M_STR-FVMAX sy-vline 
WA_T554M_STR-FNMIN sy-vline 
WA_T554M_STR-FNMAX sy-vline 
WA_T554M_STR-ZEIN1 sy-vline 
WA_T554M_STR-DAUMA sy-vline 
WA_T554M_STR-DAUMI sy-vline 
WA_T554M_STR-ZEIN2 sy-vline 
WA_T554M_STR-GEWHR sy-vline 
WA_T554M_STR-ZEIN3 sy-vline 
WA_T554M_STR-ANTRF sy-vline 
WA_T554M_STR-ZEIN4 sy-vline 
WA_T554M_STR-GESCH sy-vline 
WA_T554M_STR-ENTMR sy-vline 
WA_T554M_STR-FLAG1 sy-vline 
WA_T554M_STR-FLAG2 sy-vline 
WA_T554M_STR-REAK1 sy-vline 
WA_T554M_STR-REAK2 sy-vline 
WA_T554M_STR-REAK3 sy-vline 
WA_T554M_STR-REAK4 sy-vline 
WA_T554M_STR-ZEIN5 sy-vline 
WA_T554M_STR-AUSW1 sy-vline 
WA_T554M_STR-AUSW2 sy-vline 
WA_T554M_STR-AUSW3 sy-vline 
WA_T554M_STR-AUSW4 sy-vline 
WA_T554M_STR-SNAME sy-vline 
WA_T554M_STR-VORGN sy-vline      INTO ld_text SEPARATED BY SPACE.

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