ABAP Select data from SAP table FKKINV_REV_DOC_PARAMS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FKKINV_REV_DOC_PARAMS
*  INTO TABLE @DATA(IT_FKKINV_REV_DOC_PARAMS2).
*--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_FKKINV_REV_DOC_PARAMS INDEX 1 INTO DATA(WA_FKKINV_REV_DOC_PARAMS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FKKINV_REV_DOC_PARAMS>-CADOCTYPE = 1.
<FKKINV_REV_DOC_PARAMS>-XNOSEPREV = 1.
<FKKINV_REV_DOC_PARAMS>-OPBEL = 1.
<FKKINV_REV_DOC_PARAMS>-AWSYS = 1.
<FKKINV_REV_DOC_PARAMS>-AWTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FKKINV_REV_DOC_PARAMS-AWKEY, sy-vline,
  WA_FKKINV_REV_DOC_PARAMS-REVERSED, sy-vline,
  WA_FKKINV_REV_DOC_PARAMS-STORB, sy-vline,
  WA_FKKINV_REV_DOC_PARAMS-ABWBL, sy-vline,
  WA_FKKINV_REV_DOC_PARAMS-BUDAT, sy-vline,
  WA_FKKINV_REV_DOC_PARAMS-BLART_REV, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FKKINV_REV_DOC_PARAMS 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_FKKINV_REV_DOC_PARAMS 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_FKKINV_REV_DOC_PARAMS INTO WA_FKKINV_REV_DOC_PARAMS.


*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 OPBEL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FKKINV_REV_DOC_PARAMS-OPBEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FKKINV_REV_DOC_PARAMS-OPBEL.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field ABWBL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FKKINV_REV_DOC_PARAMS-ABWBL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FKKINV_REV_DOC_PARAMS-ABWBL.
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_FKKINV_REV_DOC_PARAMS_STR, 
CADOCTYPE TYPE STRING,
XNOSEPREV TYPE STRING,
OPBEL TYPE STRING,
AWSYS TYPE STRING,
AWTYP TYPE STRING,
AWKEY TYPE STRING,
REVERSED TYPE STRING,
STORB TYPE STRING,
ABWBL TYPE STRING,
BUDAT TYPE STRING,
BLART_REV TYPE STRING,
HERKF_REV TYPE STRING,
INTERNAL_CLEAR TYPE STRING,
STMET TYPE STRING,
REV_CLEAR_TAB TYPE STRING,
REV_DEFREV_E_TAB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FKKINV_REV_DOC_PARAMS_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_FKKINV_REV_DOC_PARAMS_STR-CADOCTYPE sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-XNOSEPREV sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-OPBEL sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-AWSYS sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-AWTYP sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-AWKEY sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-REVERSED sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-STORB sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-ABWBL sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-BUDAT sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-BLART_REV sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-HERKF_REV sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-INTERNAL_CLEAR sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-STMET sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-REV_CLEAR_TAB sy-vline 
WA_FKKINV_REV_DOC_PARAMS_STR-REV_DEFREV_E_TAB sy-vline      INTO ld_text SEPARATED BY SPACE.

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