ABAP Select data from SAP table T161G into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T161G 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 T161G. 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 T161G 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_T161G TYPE STANDARD TABLE OF T161G,
      WA_T161G TYPE T161G,
      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: <T161G> TYPE T161G.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T161G.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T161G
  INTO TABLE IT_T161G.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T161G
*  INTO TABLE @DATA(IT_T161G2).
*--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_T161G INDEX 1 INTO DATA(WA_T161G2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T161G ASSIGNING <T161G>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T161G>-MANDT = 1.
<T161G>-FRGST = 1.
<T161G>-FRGA1 = 1.
<T161G>-FRGA2 = 1.
<T161G>-FRGA3 = 1.

ENDLOOP.

LOOP AT IT_T161G INTO WA_T161G.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T161G-FRGA4, sy-vline,
  WA_T161G-FRGA5, sy-vline,
  WA_T161G-FRGA6, sy-vline,
  WA_T161G-FRGA7, sy-vline,
  WA_T161G-FRGA8, sy-vline,
  WA_T161G-FRGKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T161G 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_T161G 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_T161G INTO WA_T161G.


*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_T161G_STR, 
MANDT TYPE STRING,
FRGST TYPE STRING,
FRGA1 TYPE STRING,
FRGA2 TYPE STRING,
FRGA3 TYPE STRING,
FRGA4 TYPE STRING,
FRGA5 TYPE STRING,
FRGA6 TYPE STRING,
FRGA7 TYPE STRING,
FRGA8 TYPE STRING,
FRGKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T161G_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_T161G_STR-MANDT sy-vline 
WA_T161G_STR-FRGST sy-vline 
WA_T161G_STR-FRGA1 sy-vline 
WA_T161G_STR-FRGA2 sy-vline 
WA_T161G_STR-FRGA3 sy-vline 
WA_T161G_STR-FRGA4 sy-vline 
WA_T161G_STR-FRGA5 sy-vline 
WA_T161G_STR-FRGA6 sy-vline 
WA_T161G_STR-FRGA7 sy-vline 
WA_T161G_STR-FRGA8 sy-vline 
WA_T161G_STR-FRGKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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