ABAP Select data from SAP table GGREFA into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GGREFA
*  INTO TABLE @DATA(IT_GGREFA2).
*--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_GGREFA INDEX 1 INTO DATA(WA_GGREFA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GGREFA>-RCLNT = 1.
<GGREFA>-GL_SIRID = 1.
<GGREFA>-RLDNR = 1.
<GGREFA>-RRCTY = 1.
<GGREFA>-RVERS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GGREFA-RYEAR, sy-vline,
  WA_GGREFA-RTCUR, sy-vline,
  WA_GGREFA-RUNIT, sy-vline,
  WA_GGREFA-DRCRK, sy-vline,
  WA_GGREFA-POPER, sy-vline,
  WA_GGREFA-DOCCT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GGREFA 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_GGREFA 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_GGREFA INTO WA_GGREFA.


*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_GGREFA-RLDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GGREFA-RLDNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field RYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_GGREFA-RYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GGREFA-RYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field RUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_GGREFA-RUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GGREFA-RUNIT.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field AUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_GGREFA-AUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GGREFA-AUNIT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field REFRYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_GGREFA-REFRYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GGREFA-REFRYEAR.
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_GGREFA_STR, 
RCLNT TYPE STRING,
GL_SIRID TYPE STRING,
RLDNR TYPE STRING,
RRCTY TYPE STRING,
RVERS TYPE STRING,
RYEAR TYPE STRING,
RTCUR TYPE STRING,
RUNIT TYPE STRING,
DRCRK TYPE STRING,
POPER TYPE STRING,
DOCCT TYPE STRING,
DOCNR TYPE STRING,
DOCLN TYPE STRING,
RCOMP TYPE STRING,
ROBUKRS TYPE STRING,
RACCT TYPE STRING,
RBUSA TYPE STRING,
RCNTR TYPE STRING,
RFAREA TYPE STRING,
LOGSYS TYPE STRING,
SCOMP TYPE STRING,
SOBUKRS TYPE STRING,
SACCT TYPE STRING,
SBUSA TYPE STRING,
SCNTR TYPE STRING,
SFAREA TYPE STRING,
TSL TYPE STRING,
HSL TYPE STRING,
KSL TYPE STRING,
MSL TYPE STRING,
ASL TYPE STRING,
AUNIT TYPE STRING,
SGTXT TYPE STRING,
DOCTY TYPE STRING,
ACTIV TYPE STRING,
BUDAT TYPE STRING,
WSDAT TYPE STRING,
REFDOCNR TYPE STRING,
REFRYEAR TYPE STRING,
REFDOCLN TYPE STRING,
REFDOCCT TYPE STRING,
REFACTIV TYPE STRING,
CPUDT TYPE STRING,
CPUTM TYPE STRING,
USNAM TYPE STRING,
AWTYP TYPE STRING,
AWORG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GGREFA_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_GGREFA_STR-RCLNT sy-vline 
WA_GGREFA_STR-GL_SIRID sy-vline 
WA_GGREFA_STR-RLDNR sy-vline 
WA_GGREFA_STR-RRCTY sy-vline 
WA_GGREFA_STR-RVERS sy-vline 
WA_GGREFA_STR-RYEAR sy-vline 
WA_GGREFA_STR-RTCUR sy-vline 
WA_GGREFA_STR-RUNIT sy-vline 
WA_GGREFA_STR-DRCRK sy-vline 
WA_GGREFA_STR-POPER sy-vline 
WA_GGREFA_STR-DOCCT sy-vline 
WA_GGREFA_STR-DOCNR sy-vline 
WA_GGREFA_STR-DOCLN sy-vline 
WA_GGREFA_STR-RCOMP sy-vline 
WA_GGREFA_STR-ROBUKRS sy-vline 
WA_GGREFA_STR-RACCT sy-vline 
WA_GGREFA_STR-RBUSA sy-vline 
WA_GGREFA_STR-RCNTR sy-vline 
WA_GGREFA_STR-RFAREA sy-vline 
WA_GGREFA_STR-LOGSYS sy-vline 
WA_GGREFA_STR-SCOMP sy-vline 
WA_GGREFA_STR-SOBUKRS sy-vline 
WA_GGREFA_STR-SACCT sy-vline 
WA_GGREFA_STR-SBUSA sy-vline 
WA_GGREFA_STR-SCNTR sy-vline 
WA_GGREFA_STR-SFAREA sy-vline 
WA_GGREFA_STR-TSL sy-vline 
WA_GGREFA_STR-HSL sy-vline 
WA_GGREFA_STR-KSL sy-vline 
WA_GGREFA_STR-MSL sy-vline 
WA_GGREFA_STR-ASL sy-vline 
WA_GGREFA_STR-AUNIT sy-vline 
WA_GGREFA_STR-SGTXT sy-vline 
WA_GGREFA_STR-DOCTY sy-vline 
WA_GGREFA_STR-ACTIV sy-vline 
WA_GGREFA_STR-BUDAT sy-vline 
WA_GGREFA_STR-WSDAT sy-vline 
WA_GGREFA_STR-REFDOCNR sy-vline 
WA_GGREFA_STR-REFRYEAR sy-vline 
WA_GGREFA_STR-REFDOCLN sy-vline 
WA_GGREFA_STR-REFDOCCT sy-vline 
WA_GGREFA_STR-REFACTIV sy-vline 
WA_GGREFA_STR-CPUDT sy-vline 
WA_GGREFA_STR-CPUTM sy-vline 
WA_GGREFA_STR-USNAM sy-vline 
WA_GGREFA_STR-AWTYP sy-vline 
WA_GGREFA_STR-AWORG sy-vline      INTO ld_text SEPARATED BY SPACE.

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