ABAP Select data from SAP table CFGENERALSELECTION into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CFGENERALSELECTION
*  INTO TABLE @DATA(IT_CFGENERALSELECTION2).
*--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_CFGENERALSELECTION INDEX 1 INTO DATA(WA_CFGENERALSELECTION2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CFGENERALSELECTION>-IFIELD = 1.
<CFGENERALSELECTION>-OPT = 1.
<CFGENERALSELECTION>-SIGN = 1.
<CFGENERALSELECTION>-HIGH = 1.
<CFGENERALSELECTION>-LOW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CFGENERALSELECTION-PHIGH, sy-vline,
  WA_CFGENERALSELECTION-PLOW, sy-vline,
  WA_CFGENERALSELECTION-TXTIN, sy-vline,
  WA_CFGENERALSELECTION-SETFLAG, sy-vline,
  WA_CFGENERALSELECTION-HCLASS, sy-vline,
  WA_CFGENERALSELECTION-TYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CFGENERALSELECTION 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_CFGENERALSELECTION 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_CFGENERALSELECTION INTO WA_CFGENERALSELECTION.


*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_CFGENERALSELECTION_STR, 
IFIELD TYPE STRING,
OPT TYPE STRING,
SIGN TYPE STRING,
HIGH TYPE STRING,
LOW TYPE STRING,
PHIGH TYPE STRING,
PLOW TYPE STRING,
TXTIN TYPE STRING,
SETFLAG TYPE STRING,
HCLASS TYPE STRING,
TYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CFGENERALSELECTION_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_CFGENERALSELECTION_STR-IFIELD sy-vline 
WA_CFGENERALSELECTION_STR-OPT sy-vline 
WA_CFGENERALSELECTION_STR-SIGN sy-vline 
WA_CFGENERALSELECTION_STR-HIGH sy-vline 
WA_CFGENERALSELECTION_STR-LOW sy-vline 
WA_CFGENERALSELECTION_STR-PHIGH sy-vline 
WA_CFGENERALSELECTION_STR-PLOW sy-vline 
WA_CFGENERALSELECTION_STR-TXTIN sy-vline 
WA_CFGENERALSELECTION_STR-SETFLAG sy-vline 
WA_CFGENERALSELECTION_STR-HCLASS sy-vline 
WA_CFGENERALSELECTION_STR-TYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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