ABAP Select data from SAP table GCG_HITR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GCG_HITR
*  INTO TABLE @DATA(IT_GCG_HITR2).
*--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_GCG_HITR INDEX 1 INTO DATA(WA_GCG_HITR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GCG_HITR>-INST_ID = 1.
<GCG_HITR>-GCGHR = 1.
<GCG_HITR>-GCCUBR = 1.
<GCG_HITR>-PCTGCCUBR = 1.
<GCG_HITR>-GCCRBR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GCG_HITR-PCTGCCRBR, sy-vline,
  WA_GCG_HITR-GCG, sy-vline,
  WA_GCG_HITR-PCTGCG, sy-vline,
  WA_GCG_HITR-GCC, sy-vline,
  WA_GCG_HITR-PCTGCC, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_GCG_HITR 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_GCG_HITR 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_GCG_HITR INTO WA_GCG_HITR.


*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_GCG_HITR_STR, 
INST_ID TYPE STRING,
GCGHR TYPE STRING,
GCCUBR TYPE STRING,
PCTGCCUBR TYPE STRING,
GCCRBR TYPE STRING,
PCTGCCRBR TYPE STRING,
GCG TYPE STRING,
PCTGCG TYPE STRING,
GCC TYPE STRING,
PCTGCC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GCG_HITR_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_GCG_HITR_STR-INST_ID sy-vline 
WA_GCG_HITR_STR-GCGHR sy-vline 
WA_GCG_HITR_STR-GCCUBR sy-vline 
WA_GCG_HITR_STR-PCTGCCUBR sy-vline 
WA_GCG_HITR_STR-GCCRBR sy-vline 
WA_GCG_HITR_STR-PCTGCCRBR sy-vline 
WA_GCG_HITR_STR-GCG sy-vline 
WA_GCG_HITR_STR-PCTGCG sy-vline 
WA_GCG_HITR_STR-GCC sy-vline 
WA_GCG_HITR_STR-PCTGCC sy-vline      INTO ld_text SEPARATED BY SPACE.

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