ABAP Select data from SAP table RFCTEST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFCTEST
*  INTO TABLE @DATA(IT_RFCTEST2).
*--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_RFCTEST INDEX 1 INTO DATA(WA_RFCTEST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFCTEST>-RFCFLOAT = 1.
<RFCTEST>-RFCCHAR1 = 1.
<RFCTEST>-RFCINT2 = 1.
<RFCTEST>-RFCINT1 = 1.
<RFCTEST>-RFCCHAR4 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFCTEST-RFCINT4, sy-vline,
  WA_RFCTEST-RFCHEX3, sy-vline,
  WA_RFCTEST-RFCCHAR2, sy-vline,
  WA_RFCTEST-RFCTIME, sy-vline,
  WA_RFCTEST-RFCDATE, sy-vline,
  WA_RFCTEST-RFCDATA1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFCTEST 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_RFCTEST 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_RFCTEST INTO WA_RFCTEST.


*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_RFCTEST_STR, 
RFCFLOAT TYPE STRING,
RFCCHAR1 TYPE STRING,
RFCINT2 TYPE STRING,
RFCINT1 TYPE STRING,
RFCCHAR4 TYPE STRING,
RFCINT4 TYPE STRING,
RFCHEX3 TYPE STRING,
RFCCHAR2 TYPE STRING,
RFCTIME TYPE STRING,
RFCDATE TYPE STRING,
RFCDATA1 TYPE STRING,
RFCDATA2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFCTEST_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_RFCTEST_STR-RFCFLOAT sy-vline 
WA_RFCTEST_STR-RFCCHAR1 sy-vline 
WA_RFCTEST_STR-RFCINT2 sy-vline 
WA_RFCTEST_STR-RFCINT1 sy-vline 
WA_RFCTEST_STR-RFCCHAR4 sy-vline 
WA_RFCTEST_STR-RFCINT4 sy-vline 
WA_RFCTEST_STR-RFCHEX3 sy-vline 
WA_RFCTEST_STR-RFCCHAR2 sy-vline 
WA_RFCTEST_STR-RFCTIME sy-vline 
WA_RFCTEST_STR-RFCDATE sy-vline 
WA_RFCTEST_STR-RFCDATA1 sy-vline 
WA_RFCTEST_STR-RFCDATA2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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