ABAP Select data from SAP table CMAC_FEEDOC_DISPLAY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CMAC_FEEDOC_DISPLAY
*  INTO TABLE @DATA(IT_CMAC_FEEDOC_DISPLAY2).
*--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_CMAC_FEEDOC_DISPLAY INDEX 1 INTO DATA(WA_CMAC_FEEDOC_DISPLAY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CMAC_FEEDOC_DISPLAY>-DOCNR = 1.
<CMAC_FEEDOC_DISPLAY>-STOBJID = 1.
<CMAC_FEEDOC_DISPLAY>-STUDENT12 = 1.
<CMAC_FEEDOC_DISPLAY>-ST_NAME = 1.
<CMAC_FEEDOC_DISPLAY>-PARTNER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CMAC_FEEDOC_DISPLAY-PERSL, sy-vline,
  WA_CMAC_FEEDOC_DISPLAY-PERSLT, sy-vline,
  WA_CMAC_FEEDOC_DISPLAY-CALC_BASE, sy-vline,
  WA_CMAC_FEEDOC_DISPLAY-CALC_BASET, sy-vline,
  WA_CMAC_FEEDOC_DISPLAY-FEECALCMODE, sy-vline,
  WA_CMAC_FEEDOC_DISPLAY-FEECALCMODET, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CMAC_FEEDOC_DISPLAY 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_CMAC_FEEDOC_DISPLAY 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_CMAC_FEEDOC_DISPLAY INTO WA_CMAC_FEEDOC_DISPLAY.


*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 PIQST, internal->external for field STUDENT12
CALL FUNCTION 'CONVERSION_EXIT_PIQST_OUTPUT'
  EXPORTING
    input =                      WA_CMAC_FEEDOC_DISPLAY-STUDENT12
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMAC_FEEDOC_DISPLAY-STUDENT12.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field OPBEL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMAC_FEEDOC_DISPLAY-OPBEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMAC_FEEDOC_DISPLAY-OPBEL.
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_CMAC_FEEDOC_DISPLAY_STR, 
DOCNR TYPE STRING,
STOBJID TYPE STRING,
STUDENT12 TYPE STRING,
ST_NAME TYPE STRING,
PARTNER TYPE STRING,
PERSL TYPE STRING,
PERSLT TYPE STRING,
CALC_BASE TYPE STRING,
CALC_BASET TYPE STRING,
FEECALCMODE TYPE STRING,
FEECALCMODET TYPE STRING,
CALCDATE TYPE STRING,
CPUDT TYPE STRING,
CPUTM TYPE STRING,
UNAME TYPE STRING,
FEEPROC TYPE STRING,
FEEPROCT TYPE STRING,
DOCAMT TYPE STRING,
DOCCUKY TYPE STRING,
BALOGNR TYPE STRING,
XARCHIVED TYPE STRING,
OPBEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CMAC_FEEDOC_DISPLAY_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_CMAC_FEEDOC_DISPLAY_STR-DOCNR sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-STOBJID sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-STUDENT12 sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-ST_NAME sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-PARTNER sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-PERSL sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-PERSLT sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-CALC_BASE sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-CALC_BASET sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-FEECALCMODE sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-FEECALCMODET sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-CALCDATE sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-CPUDT sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-CPUTM sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-UNAME sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-FEEPROC sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-FEEPROCT sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-DOCAMT sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-DOCCUKY sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-BALOGNR sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-XARCHIVED sy-vline 
WA_CMAC_FEEDOC_DISPLAY_STR-OPBEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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