ABAP Select data from SAP table GFD_J2F_QUESTION into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP GFD_J2F_QUESTION 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 GFD_J2F_QUESTION. 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 GFD_J2F_QUESTION 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_GFD_J2F_QUESTION TYPE STANDARD TABLE OF GFD_J2F_QUESTION,
      WA_GFD_J2F_QUESTION TYPE GFD_J2F_QUESTION,
      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: <GFD_J2F_QUESTION> TYPE GFD_J2F_QUESTION.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_GFD_J2F_QUESTION.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM GFD_J2F_QUESTION
  INTO TABLE IT_GFD_J2F_QUESTION.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GFD_J2F_QUESTION
*  INTO TABLE @DATA(IT_GFD_J2F_QUESTION2).
*--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_GFD_J2F_QUESTION INDEX 1 INTO DATA(WA_GFD_J2F_QUESTION2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_GFD_J2F_QUESTION ASSIGNING <GFD_J2F_QUESTION>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GFD_J2F_QUESTION>-ID = 1.
<GFD_J2F_QUESTION>-BRANDNEWQUESTION = 1.
<GFD_J2F_QUESTION>-CONFIGMAPPING = 1.
<GFD_J2F_QUESTION>-TABNAME = 1.
<GFD_J2F_QUESTION>-FIELDNAME = 1.

ENDLOOP.

LOOP AT IT_GFD_J2F_QUESTION INTO WA_GFD_J2F_QUESTION.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GFD_J2F_QUESTION-VALUE, sy-vline,
  WA_GFD_J2F_QUESTION-HELPTEXT, sy-vline,
  WA_GFD_J2F_QUESTION-MANDATORY, sy-vline,
  WA_GFD_J2F_QUESTION-EDIT, sy-vline,
  WA_GFD_J2F_QUESTION-PARENTQID, sy-vline,
  WA_GFD_J2F_QUESTION-PARENTOID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GFD_J2F_QUESTION 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_GFD_J2F_QUESTION 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_GFD_J2F_QUESTION INTO WA_GFD_J2F_QUESTION.


*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_GFD_J2F_QUESTION_STR, 
ID TYPE STRING,
BRANDNEWQUESTION TYPE STRING,
CONFIGMAPPING TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
VALUE TYPE STRING,
HELPTEXT TYPE STRING,
MANDATORY TYPE STRING,
EDIT TYPE STRING,
PARENTQID TYPE STRING,
PARENTOID TYPE STRING,
QUESTIONTEXT TYPE STRING,
DOMAIN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GFD_J2F_QUESTION_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_GFD_J2F_QUESTION_STR-ID sy-vline 
WA_GFD_J2F_QUESTION_STR-BRANDNEWQUESTION sy-vline 
WA_GFD_J2F_QUESTION_STR-CONFIGMAPPING sy-vline 
WA_GFD_J2F_QUESTION_STR-TABNAME sy-vline 
WA_GFD_J2F_QUESTION_STR-FIELDNAME sy-vline 
WA_GFD_J2F_QUESTION_STR-VALUE sy-vline 
WA_GFD_J2F_QUESTION_STR-HELPTEXT sy-vline 
WA_GFD_J2F_QUESTION_STR-MANDATORY sy-vline 
WA_GFD_J2F_QUESTION_STR-EDIT sy-vline 
WA_GFD_J2F_QUESTION_STR-PARENTQID sy-vline 
WA_GFD_J2F_QUESTION_STR-PARENTOID sy-vline 
WA_GFD_J2F_QUESTION_STR-QUESTIONTEXT sy-vline 
WA_GFD_J2F_QUESTION_STR-DOMAIN sy-vline      INTO ld_text SEPARATED BY SPACE.

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