ABAP Select data from SAP table QNNNNSA into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP QNNNNSA 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 QNNNNSA. 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 QNNNNSA 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_QNNNNSA TYPE STANDARD TABLE OF QNNNNSA,
      WA_QNNNNSA TYPE QNNNNSA,
      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: <QNNNNSA> TYPE QNNNNSA.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM QNNNNSA
*  INTO TABLE @DATA(IT_QNNNNSA2).
*--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_QNNNNSA INDEX 1 INTO DATA(WA_QNNNNSA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<QNNNNSA>-ETDTI = 1.
<QNNNNSA>-ENTRI = 1.
<QNNNNSA>-DLEPI = 1.
<QNNNNSA>-VSEPI = 1.
<QNNNNSA>-IQEPI = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_QNNNNSA-PSPEI, sy-vline,
  WA_QNNNNSA-FPDAI, sy-vline,
  WA_QNNNNSA-EXPII, sy-vline,
  WA_QNNNNSA-GBDAI, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_QNNNNSA 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_QNNNNSA 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_QNNNNSA INTO WA_QNNNNSA.


*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.

*Conversion exit ISDAT, internal->external for field ETDTI
CALL FUNCTION 'CONVERSION_EXIT_ISDAT_OUTPUT'
  EXPORTING
    input =                      WA_QNNNNSA-ETDTI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNNNNSA-ETDTI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISDAT, internal->external for field ENTRI
CALL FUNCTION 'CONVERSION_EXIT_ISDAT_OUTPUT'
  EXPORTING
    input =                      WA_QNNNNSA-ENTRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNNNNSA-ENTRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISDAT, internal->external for field DLEPI
CALL FUNCTION 'CONVERSION_EXIT_ISDAT_OUTPUT'
  EXPORTING
    input =                      WA_QNNNNSA-DLEPI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNNNNSA-DLEPI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISDAT, internal->external for field VSEPI
CALL FUNCTION 'CONVERSION_EXIT_ISDAT_OUTPUT'
  EXPORTING
    input =                      WA_QNNNNSA-VSEPI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNNNNSA-VSEPI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISDAT, internal->external for field IQEPI
CALL FUNCTION 'CONVERSION_EXIT_ISDAT_OUTPUT'
  EXPORTING
    input =                      WA_QNNNNSA-IQEPI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNNNNSA-IQEPI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISDAT, internal->external for field PSPEI
CALL FUNCTION 'CONVERSION_EXIT_ISDAT_OUTPUT'
  EXPORTING
    input =                      WA_QNNNNSA-PSPEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNNNNSA-PSPEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISDAT, internal->external for field FPDAI
CALL FUNCTION 'CONVERSION_EXIT_ISDAT_OUTPUT'
  EXPORTING
    input =                      WA_QNNNNSA-FPDAI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNNNNSA-FPDAI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISDAT, internal->external for field EXPII
CALL FUNCTION 'CONVERSION_EXIT_ISDAT_OUTPUT'
  EXPORTING
    input =                      WA_QNNNNSA-EXPII
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNNNNSA-EXPII.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISDAT, internal->external for field GBDAI
CALL FUNCTION 'CONVERSION_EXIT_ISDAT_OUTPUT'
  EXPORTING
    input =                      WA_QNNNNSA-GBDAI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNNNNSA-GBDAI.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_QNNNNSA_STR, 
ETDTI TYPE STRING,
ENTRI TYPE STRING,
DLEPI TYPE STRING,
VSEPI TYPE STRING,
IQEPI TYPE STRING,
PSPEI TYPE STRING,
FPDAI TYPE STRING,
EXPII TYPE STRING,
GBDAI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_QNNNNSA_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_QNNNNSA_STR-ETDTI sy-vline 
WA_QNNNNSA_STR-ENTRI sy-vline 
WA_QNNNNSA_STR-DLEPI sy-vline 
WA_QNNNNSA_STR-VSEPI sy-vline 
WA_QNNNNSA_STR-IQEPI sy-vline 
WA_QNNNNSA_STR-PSPEI sy-vline 
WA_QNNNNSA_STR-FPDAI sy-vline 
WA_QNNNNSA_STR-EXPII sy-vline 
WA_QNNNNSA_STR-GBDAI sy-vline      INTO ld_text SEPARATED BY SPACE.

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