ABAP Select data from SAP table GRT882 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP GRT882 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 GRT882. 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 GRT882 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_GRT882 TYPE STANDARD TABLE OF GRT882,
      WA_GRT882 TYPE GRT882,
      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: <GRT882> TYPE GRT882.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_GRT882.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM GRT882
  INTO TABLE IT_GRT882.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GRT882
*  INTO TABLE @DATA(IT_GRT8822).
*--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_GRT882 INDEX 1 INTO DATA(WA_GRT8822).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_GRT882 ASSIGNING <GRT882>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GRT882>-MANDT = 1.
<GRT882>-BUKRS = 1.
<GRT882>-RLDNR = 1.
<GRT882>-PERIV = 1.
<GRT882>-CURR1 = 1.

ENDLOOP.

LOOP AT IT_GRT882 INTO WA_GRT882.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GRT882-CURR2, sy-vline,
  WA_GRT882-CURR3, sy-vline,
  WA_GRT882-LOGSYS, sy-vline,
  WA_GRT882-ALTSV, sy-vline,
  WA_GRT882-KTOPL, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_GRT882 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_GRT882 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_GRT882 INTO WA_GRT882.


*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 ALPHA, internal->external for field RLDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GRT882-RLDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GRT882-RLDNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GRT882-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GRT882-LOGSYS.
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_GRT882_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
RLDNR TYPE STRING,
PERIV TYPE STRING,
CURR1 TYPE STRING,
CURR2 TYPE STRING,
CURR3 TYPE STRING,
LOGSYS TYPE STRING,
ALTSV TYPE STRING,
KTOPL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GRT882_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_GRT882_STR-MANDT sy-vline 
WA_GRT882_STR-BUKRS sy-vline 
WA_GRT882_STR-RLDNR sy-vline 
WA_GRT882_STR-PERIV sy-vline 
WA_GRT882_STR-CURR1 sy-vline 
WA_GRT882_STR-CURR2 sy-vline 
WA_GRT882_STR-CURR3 sy-vline 
WA_GRT882_STR-LOGSYS sy-vline 
WA_GRT882_STR-ALTSV sy-vline 
WA_GRT882_STR-KTOPL sy-vline      INTO ld_text SEPARATED BY SPACE.

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