ABAP Select data from SAP table SFSG_FREQ into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SFSG_FREQ
*  INTO TABLE @DATA(IT_SFSG_FREQ2).
*--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_SFSG_FREQ INDEX 1 INTO DATA(WA_SFSG_FREQ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SFSG_FREQ>-REPL_UNIT = 1.
<SFSG_FREQ>-PERIODIC = 1.
<SFSG_FREQ>-PRDDAYS = 1.
<SFSG_FREQ>-PRDHOURS = 1.
<SFSG_FREQ>-PRDMINS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SFSG_FREQ-PRDSECS, sy-vline,
  WA_SFSG_FREQ-PRDWEEKS, sy-vline,
  WA_SFSG_FREQ-PRDMONTHS, sy-vline,
  WA_SFSG_FREQ-SDLSTRTDT, sy-vline,
  WA_SFSG_FREQ-SDLSTRTTM, sy-vline,
  WA_SFSG_FREQ-RETRIEVE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SFSG_FREQ 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_SFSG_FREQ 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_SFSG_FREQ INTO WA_SFSG_FREQ.


*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_SFSG_FREQ_STR, 
REPL_UNIT TYPE STRING,
PERIODIC TYPE STRING,
PRDDAYS TYPE STRING,
PRDHOURS TYPE STRING,
PRDMINS TYPE STRING,
PRDSECS TYPE STRING,
PRDWEEKS TYPE STRING,
PRDMONTHS TYPE STRING,
SDLSTRTDT TYPE STRING,
SDLSTRTTM TYPE STRING,
RETRIEVE TYPE STRING,
SYSTEM_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SFSG_FREQ_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_SFSG_FREQ_STR-REPL_UNIT sy-vline 
WA_SFSG_FREQ_STR-PERIODIC sy-vline 
WA_SFSG_FREQ_STR-PRDDAYS sy-vline 
WA_SFSG_FREQ_STR-PRDHOURS sy-vline 
WA_SFSG_FREQ_STR-PRDMINS sy-vline 
WA_SFSG_FREQ_STR-PRDSECS sy-vline 
WA_SFSG_FREQ_STR-PRDWEEKS sy-vline 
WA_SFSG_FREQ_STR-PRDMONTHS sy-vline 
WA_SFSG_FREQ_STR-SDLSTRTDT sy-vline 
WA_SFSG_FREQ_STR-SDLSTRTTM sy-vline 
WA_SFSG_FREQ_STR-RETRIEVE sy-vline 
WA_SFSG_FREQ_STR-SYSTEM_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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