ABAP Select data from SAP table T056G into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T056G 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 T056G. 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 T056G 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_T056G TYPE STANDARD TABLE OF T056G,
      WA_T056G TYPE T056G,
      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: <T056G> TYPE T056G.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T056G.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T056G
  INTO TABLE IT_T056G.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T056G
*  INTO TABLE @DATA(IT_T056G2).
*--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_T056G INDEX 1 INTO DATA(WA_T056G2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T056G ASSIGNING <T056G>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T056G>-MANDT = 1.
<T056G>-IRULE = 1.
<T056G>-INTMETHOD = 1.
<T056G>-XICNUM = 1.
<T056G>-XIROUND = 1.

ENDLOOP.

LOOP AT IT_T056G INTO WA_T056G.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T056G-IINTERVAL, sy-vline,
  WA_T056G-IMONTH, sy-vline,
  WA_T056G-SCALEDTYP, sy-vline,
  WA_T056G-XAMINT, sy-vline,
  WA_T056G-XDAYINT, sy-vline,
  WA_T056G-XDOCMIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T056G 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_T056G 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_T056G INTO WA_T056G.


*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 IRULE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T056G-IRULE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T056G-IRULE.
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_T056G_STR, 
MANDT TYPE STRING,
IRULE TYPE STRING,
INTMETHOD TYPE STRING,
XICNUM TYPE STRING,
XIROUND TYPE STRING,
IINTERVAL TYPE STRING,
IMONTH TYPE STRING,
SCALEDTYP TYPE STRING,
XAMINT TYPE STRING,
XDAYINT TYPE STRING,
XDOCMIN TYPE STRING,
XINTINT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T056G_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_T056G_STR-MANDT sy-vline 
WA_T056G_STR-IRULE sy-vline 
WA_T056G_STR-INTMETHOD sy-vline 
WA_T056G_STR-XICNUM sy-vline 
WA_T056G_STR-XIROUND sy-vline 
WA_T056G_STR-IINTERVAL sy-vline 
WA_T056G_STR-IMONTH sy-vline 
WA_T056G_STR-SCALEDTYP sy-vline 
WA_T056G_STR-XAMINT sy-vline 
WA_T056G_STR-XDAYINT sy-vline 
WA_T056G_STR-XDOCMIN sy-vline 
WA_T056G_STR-XINTINT sy-vline      INTO ld_text SEPARATED BY SPACE.

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