ABAP Select data from SAP table QGEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM QGEN
*  INTO TABLE @DATA(IT_QGEN2).
*--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_QGEN INDEX 1 INTO DATA(WA_QGEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<QGEN>-MOLGA = 1.
<QGEN>-PERMO = 1.
<QGEN>-DATMO = 1.
<QGEN>-BEYRS = 1.
<QGEN>-ENDYR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_QGEN-BEMON, sy-vline,
  WA_QGEN-BEDAY, sy-vline,
  WA_QGEN-BEPRD, sy-vline,
  WA_QGEN-TAXYR, sy-vline,
  WA_QGEN-NUMDY, sy-vline,
  WA_QGEN-PRULE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_QGEN 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_QGEN 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_QGEN INTO WA_QGEN.


*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 GJAHR, internal->external for field BEYRS
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_QGEN-BEYRS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QGEN-BEYRS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field ENDYR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_QGEN-ENDYR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QGEN-ENDYR.
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_QGEN_STR, 
MOLGA TYPE STRING,
PERMO TYPE STRING,
DATMO TYPE STRING,
BEYRS TYPE STRING,
ENDYR TYPE STRING,
BEMON TYPE STRING,
BEDAY TYPE STRING,
BEPRD TYPE STRING,
TAXYR TYPE STRING,
NUMDY TYPE STRING,
PRULE TYPE STRING,
BEGDA TYPE STRING,
BETXT TYPE STRING,
ENDDA TYPE STRING,
ENTXT TYPE STRING,
OFFST TYPE STRING,
OFTXT TYPE STRING,
FLTXYR TYPE STRING,
UPDATE TYPE STRING,
DTUSE TYPE STRING,
DIFFD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_QGEN_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_QGEN_STR-MOLGA sy-vline 
WA_QGEN_STR-PERMO sy-vline 
WA_QGEN_STR-DATMO sy-vline 
WA_QGEN_STR-BEYRS sy-vline 
WA_QGEN_STR-ENDYR sy-vline 
WA_QGEN_STR-BEMON sy-vline 
WA_QGEN_STR-BEDAY sy-vline 
WA_QGEN_STR-BEPRD sy-vline 
WA_QGEN_STR-TAXYR sy-vline 
WA_QGEN_STR-NUMDY sy-vline 
WA_QGEN_STR-PRULE sy-vline 
WA_QGEN_STR-BEGDA sy-vline 
WA_QGEN_STR-BETXT sy-vline 
WA_QGEN_STR-ENDDA sy-vline 
WA_QGEN_STR-ENTXT sy-vline 
WA_QGEN_STR-OFFST sy-vline 
WA_QGEN_STR-OFTXT sy-vline 
WA_QGEN_STR-FLTXYR sy-vline 
WA_QGEN_STR-UPDATE sy-vline 
WA_QGEN_STR-DTUSE sy-vline 
WA_QGEN_STR-DIFFD sy-vline      INTO ld_text SEPARATED BY SPACE.

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