ABAP Select data from SAP table NQFUSTD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NQFUSTD
*  INTO TABLE @DATA(IT_NQFUSTD2).
*--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_NQFUSTD INDEX 1 INTO DATA(WA_NQFUSTD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NQFUSTD>-USTITLE = 1.
<NQFUSTD>-USNUMBER = 1.
<NQFUSTD>-USTEXT = 1.
<NQFUSTD>-NQFLEVEL = 1.
<NQFUSTD>-NQFBAND = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NQFUSTD-USCREDIT, sy-vline,
  WA_NQFUSTD-USFIELD, sy-vline,
  WA_NQFUSTD-USSUBFIELD, sy-vline,
  WA_NQFUSTD-ABETLEVEL, sy-vline,
  WA_NQFUSTD-USISSDATE, sy-vline,
  WA_NQFUSTD-USREVDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NQFUSTD 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_NQFUSTD 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_NQFUSTD INTO WA_NQFUSTD.


*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_NQFUSTD_STR, 
USTITLE TYPE STRING,
USNUMBER TYPE STRING,
USTEXT TYPE STRING,
NQFLEVEL TYPE STRING,
NQFBAND TYPE STRING,
USCREDIT TYPE STRING,
USFIELD TYPE STRING,
USSUBFIELD TYPE STRING,
ABETLEVEL TYPE STRING,
USISSDATE TYPE STRING,
USREVDATE TYPE STRING,
USNATSTD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NQFUSTD_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_NQFUSTD_STR-USTITLE sy-vline 
WA_NQFUSTD_STR-USNUMBER sy-vline 
WA_NQFUSTD_STR-USTEXT sy-vline 
WA_NQFUSTD_STR-NQFLEVEL sy-vline 
WA_NQFUSTD_STR-NQFBAND sy-vline 
WA_NQFUSTD_STR-USCREDIT sy-vline 
WA_NQFUSTD_STR-USFIELD sy-vline 
WA_NQFUSTD_STR-USSUBFIELD sy-vline 
WA_NQFUSTD_STR-ABETLEVEL sy-vline 
WA_NQFUSTD_STR-USISSDATE sy-vline 
WA_NQFUSTD_STR-USREVDATE sy-vline 
WA_NQFUSTD_STR-USNATSTD sy-vline      INTO ld_text SEPARATED BY SPACE.

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