ABAP Select data from SAP table V_161G into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_161G 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 V_161G. 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 V_161G 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_V_161G TYPE STANDARD TABLE OF V_161G,
      WA_V_161G TYPE V_161G,
      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: <V_161G> TYPE V_161G.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_161G.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_161G
  INTO TABLE IT_V_161G.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_161G
*  INTO TABLE @DATA(IT_V_161G2).
*--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_V_161G INDEX 1 INTO DATA(WA_V_161G2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_161G ASSIGNING <V_161G>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_161G>-MANDT = 1.
<V_161G>-FRGST = 1.
<V_161G>-FRGA1 = 1.
<V_161G>-FRGA2 = 1.
<V_161G>-FRGA3 = 1.

ENDLOOP.

LOOP AT IT_V_161G INTO WA_V_161G.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_161G-FRGA4, sy-vline,
  WA_V_161G-FRGA5, sy-vline,
  WA_V_161G-FRGA6, sy-vline,
  WA_V_161G-FRGA7, sy-vline,
  WA_V_161G-FRGA8, sy-vline,
  WA_V_161G-FRGKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_161G 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_V_161G 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_V_161G INTO WA_V_161G.


*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_V_161G_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,
FKZTX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_161G_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_V_161G_STR-MANDT sy-vline 
WA_V_161G_STR-FRGST sy-vline 
WA_V_161G_STR-FRGA1 sy-vline 
WA_V_161G_STR-FRGA2 sy-vline 
WA_V_161G_STR-FRGA3 sy-vline 
WA_V_161G_STR-FRGA4 sy-vline 
WA_V_161G_STR-FRGA5 sy-vline 
WA_V_161G_STR-FRGA6 sy-vline 
WA_V_161G_STR-FRGA7 sy-vline 
WA_V_161G_STR-FRGA8 sy-vline 
WA_V_161G_STR-FRGKZ sy-vline 
WA_V_161G_STR-FKZTX sy-vline      INTO ld_text SEPARATED BY SPACE.

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