ABAP Select data from SAP table PT161F into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PT161F 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 PT161F. 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 PT161F 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_PT161F TYPE STANDARD TABLE OF PT161F,
      WA_PT161F TYPE PT161F,
      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: <PT161F> TYPE PT161F.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PT161F.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PT161F
  INTO TABLE IT_PT161F.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PT161F
*  INTO TABLE @DATA(IT_PT161F2).
*--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_PT161F INDEX 1 INTO DATA(WA_PT161F2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PT161F ASSIGNING <PT161F>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PT161F>-FRGA1 = 1.
<PT161F>-FRGA2 = 1.
<PT161F>-FRGA3 = 1.
<PT161F>-FRGA4 = 1.
<PT161F>-FRGA5 = 1.

ENDLOOP.

LOOP AT IT_PT161F INTO WA_PT161F.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PT161F-FRGA6, sy-vline,
  WA_PT161F-FRGA7, sy-vline,
  WA_PT161F-FRGA8, sy-vline,
  WA_PT161F-FRGAX, sy-vline,
  WA_PT161F-FRGAY, sy-vline,
  WA_PT161F-FRGAZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PT161F 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_PT161F 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_PT161F INTO WA_PT161F.


*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_PT161F_STR, 
FRGA1 TYPE STRING,
FRGA2 TYPE STRING,
FRGA3 TYPE STRING,
FRGA4 TYPE STRING,
FRGA5 TYPE STRING,
FRGA6 TYPE STRING,
FRGA7 TYPE STRING,
FRGA8 TYPE STRING,
FRGAX TYPE STRING,
FRGAY TYPE STRING,
FRGAZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PT161F_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_PT161F_STR-FRGA1 sy-vline 
WA_PT161F_STR-FRGA2 sy-vline 
WA_PT161F_STR-FRGA3 sy-vline 
WA_PT161F_STR-FRGA4 sy-vline 
WA_PT161F_STR-FRGA5 sy-vline 
WA_PT161F_STR-FRGA6 sy-vline 
WA_PT161F_STR-FRGA7 sy-vline 
WA_PT161F_STR-FRGA8 sy-vline 
WA_PT161F_STR-FRGAX sy-vline 
WA_PT161F_STR-FRGAY sy-vline 
WA_PT161F_STR-FRGAZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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