ABAP Select data from SAP table CRFLATFILE 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 CRFLATFILE 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 CRFLATFILE. 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 CRFLATFILE 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_CRFLATFILE TYPE STANDARD TABLE OF CRFLATFILE,
      WA_CRFLATFILE TYPE CRFLATFILE,
      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: <CRFLATFILE> TYPE CRFLATFILE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CRFLATFILE
*  INTO TABLE @DATA(IT_CRFLATFILE2).
*--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_CRFLATFILE INDEX 1 INTO DATA(WA_CRFLATFILE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CRFLATFILE>-RECTYP = 1.
<CRFLATFILE>-CCINS = 1.
<CRFLATFILE>-CARDNO = 1.
<CRFLATFILE>-REGION = 1.
<CRFLATFILE>-HWAER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CRFLATFILE-TRHWBT, sy-vline,
  WA_CRFLATFILE-TRLCTAX, sy-vline,
  WA_CRFLATFILE-SHKZG, sy-vline,
  WA_CRFLATFILE-DTPOST, sy-vline,
  WA_CRFLATFILE-DTTRAN, sy-vline,
  WA_CRFLATFILE-AUTHNO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CRFLATFILE 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_CRFLATFILE 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_CRFLATFILE INTO WA_CRFLATFILE.


*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_CRFLATFILE_STR, 
RECTYP TYPE STRING,
CCINS TYPE STRING,
CARDNO TYPE STRING,
REGION TYPE STRING,
HWAER TYPE STRING,
TRHWBT TYPE STRING,
TRLCTAX TYPE STRING,
SHKZG TYPE STRING,
DTPOST TYPE STRING,
DTTRAN TYPE STRING,
AUTHNO TYPE STRING,
FWAER TYPE STRING,
TRFWBT TYPE STRING,
TRFCTAX TYPE STRING,
SUPNAM TYPE STRING,
REFCOD TYPE STRING,
DTSTAT TYPE STRING,
MERCAT TYPE STRING,
XBLNR TYPE STRING,
BKTXT TYPE STRING,
SGTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CRFLATFILE_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_CRFLATFILE_STR-RECTYP sy-vline 
WA_CRFLATFILE_STR-CCINS sy-vline 
WA_CRFLATFILE_STR-CARDNO sy-vline 
WA_CRFLATFILE_STR-REGION sy-vline 
WA_CRFLATFILE_STR-HWAER sy-vline 
WA_CRFLATFILE_STR-TRHWBT sy-vline 
WA_CRFLATFILE_STR-TRLCTAX sy-vline 
WA_CRFLATFILE_STR-SHKZG sy-vline 
WA_CRFLATFILE_STR-DTPOST sy-vline 
WA_CRFLATFILE_STR-DTTRAN sy-vline 
WA_CRFLATFILE_STR-AUTHNO sy-vline 
WA_CRFLATFILE_STR-FWAER sy-vline 
WA_CRFLATFILE_STR-TRFWBT sy-vline 
WA_CRFLATFILE_STR-TRFCTAX sy-vline 
WA_CRFLATFILE_STR-SUPNAM sy-vline 
WA_CRFLATFILE_STR-REFCOD sy-vline 
WA_CRFLATFILE_STR-DTSTAT sy-vline 
WA_CRFLATFILE_STR-MERCAT sy-vline 
WA_CRFLATFILE_STR-XBLNR sy-vline 
WA_CRFLATFILE_STR-BKTXT sy-vline 
WA_CRFLATFILE_STR-SGTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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