ABAP Select data from SAP table GCCB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GCCB
*  INTO TABLE @DATA(IT_GCCB2).
*--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_GCCB INDEX 1 INTO DATA(WA_GCCB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GCCB>-MANDT = 1.
<GCCB>-RELART = 1.
<GCCB>-TASK = 1.
<GCCB>-HOME = 1.
<GCCB>-STEP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GCCB-CNT, sy-vline,
  WA_GCCB-SFLDTYP, sy-vline,
  WA_GCCB-SPARAMNAME, sy-vline,
  WA_GCCB-SFELDNAME, sy-vline,
  WA_GCCB-SSTEP, sy-vline,
  WA_GCCB-TFLDTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GCCB 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_GCCB 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_GCCB INTO WA_GCCB.


*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_GCCB_STR, 
MANDT TYPE STRING,
RELART TYPE STRING,
TASK TYPE STRING,
HOME TYPE STRING,
STEP TYPE STRING,
CNT TYPE STRING,
SFLDTYP TYPE STRING,
SPARAMNAME TYPE STRING,
SFELDNAME TYPE STRING,
SSTEP TYPE STRING,
TFLDTYP TYPE STRING,
TPARAMNAME TYPE STRING,
TFELDNAME TYPE STRING,
TSTEP TYPE STRING,
RELFLG TYPE STRING,
KTFLG TYPE STRING,
VMID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GCCB_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_GCCB_STR-MANDT sy-vline 
WA_GCCB_STR-RELART sy-vline 
WA_GCCB_STR-TASK sy-vline 
WA_GCCB_STR-HOME sy-vline 
WA_GCCB_STR-STEP sy-vline 
WA_GCCB_STR-CNT sy-vline 
WA_GCCB_STR-SFLDTYP sy-vline 
WA_GCCB_STR-SPARAMNAME sy-vline 
WA_GCCB_STR-SFELDNAME sy-vline 
WA_GCCB_STR-SSTEP sy-vline 
WA_GCCB_STR-TFLDTYP sy-vline 
WA_GCCB_STR-TPARAMNAME sy-vline 
WA_GCCB_STR-TFELDNAME sy-vline 
WA_GCCB_STR-TSTEP sy-vline 
WA_GCCB_STR-RELFLG sy-vline 
WA_GCCB_STR-KTFLG sy-vline 
WA_GCCB_STR-VMID sy-vline      INTO ld_text SEPARATED BY SPACE.

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