ABAP Select data from SAP table FISV_MREF_DOC_01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP FISV_MREF_DOC_01 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 FISV_MREF_DOC_01. 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 FISV_MREF_DOC_01 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_FISV_MREF_DOC_01 TYPE STANDARD TABLE OF FISV_MREF_DOC_01,
      WA_FISV_MREF_DOC_01 TYPE FISV_MREF_DOC_01,
      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: <FISV_MREF_DOC_01> TYPE FISV_MREF_DOC_01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_FISV_MREF_DOC_01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM FISV_MREF_DOC_01
  INTO TABLE IT_FISV_MREF_DOC_01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FISV_MREF_DOC_01
*  INTO TABLE @DATA(IT_FISV_MREF_DOC_012).
*--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_FISV_MREF_DOC_01 INDEX 1 INTO DATA(WA_FISV_MREF_DOC_012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_FISV_MREF_DOC_01 ASSIGNING <FISV_MREF_DOC_01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FISV_MREF_DOC_01>-MANDT = 1.
<FISV_MREF_DOC_01>-BUKRS = 1.
<FISV_MREF_DOC_01>-GJAHR = 1.
<FISV_MREF_DOC_01>-XBLNR = 1.
<FISV_MREF_DOC_01>-RLDNR = 1.

ENDLOOP.

LOOP AT IT_FISV_MREF_DOC_01 INTO WA_FISV_MREF_DOC_01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FISV_MREF_DOC_01-RLDNR_PERS, sy-vline,
  WA_FISV_MREF_DOC_01-DOCLN, sy-vline,
  WA_FISV_MREF_DOC_01-BELNR, sy-vline,
  WA_FISV_MREF_DOC_01-KOART, sy-vline,
  WA_FISV_MREF_DOC_01-BLDAT, sy-vline,
  WA_FISV_MREF_DOC_01-BLART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FISV_MREF_DOC_01 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_FISV_MREF_DOC_01 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_FISV_MREF_DOC_01 INTO WA_FISV_MREF_DOC_01.


*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 GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_FISV_MREF_DOC_01-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FISV_MREF_DOC_01-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RLDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FISV_MREF_DOC_01-RLDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FISV_MREF_DOC_01-RLDNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RLDNR_PERS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FISV_MREF_DOC_01-RLDNR_PERS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FISV_MREF_DOC_01-RLDNR_PERS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FISV_MREF_DOC_01-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FISV_MREF_DOC_01-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RACCT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FISV_MREF_DOC_01-RACCT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FISV_MREF_DOC_01-RACCT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field WAKONTO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FISV_MREF_DOC_01-WAKONTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FISV_MREF_DOC_01-WAKONTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STBLG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FISV_MREF_DOC_01-STBLG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FISV_MREF_DOC_01-STBLG.
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_FISV_MREF_DOC_01_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
GJAHR TYPE STRING,
XBLNR TYPE STRING,
RLDNR TYPE STRING,
RLDNR_PERS TYPE STRING,
DOCLN TYPE STRING,
BELNR TYPE STRING,
KOART TYPE STRING,
BLDAT TYPE STRING,
BLART TYPE STRING,
CPUDT TYPE STRING,
CREATIONDATE TYPE STRING,
BUDAT TYPE STRING,
ZUONR TYPE STRING,
USNAM TYPE STRING,
BSCHL TYPE STRING,
HSL TYPE STRING,
RHCUR TYPE STRING,
WSL TYPE STRING,
RWCUR TYPE STRING,
AMOUNTINFUNCTIONALCURRENCY TYPE STRING,
FUNCTIONALCURRENCY TYPE STRING,
KTOPL TYPE STRING,
RACCT TYPE STRING,
UMSKZ TYPE STRING,
WAKONTO TYPE STRING,
STBLG TYPE STRING,
STGRD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FISV_MREF_DOC_01_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_FISV_MREF_DOC_01_STR-MANDT sy-vline 
WA_FISV_MREF_DOC_01_STR-BUKRS sy-vline 
WA_FISV_MREF_DOC_01_STR-GJAHR sy-vline 
WA_FISV_MREF_DOC_01_STR-XBLNR sy-vline 
WA_FISV_MREF_DOC_01_STR-RLDNR sy-vline 
WA_FISV_MREF_DOC_01_STR-RLDNR_PERS sy-vline 
WA_FISV_MREF_DOC_01_STR-DOCLN sy-vline 
WA_FISV_MREF_DOC_01_STR-BELNR sy-vline 
WA_FISV_MREF_DOC_01_STR-KOART sy-vline 
WA_FISV_MREF_DOC_01_STR-BLDAT sy-vline 
WA_FISV_MREF_DOC_01_STR-BLART sy-vline 
WA_FISV_MREF_DOC_01_STR-CPUDT sy-vline 
WA_FISV_MREF_DOC_01_STR-CREATIONDATE sy-vline 
WA_FISV_MREF_DOC_01_STR-BUDAT sy-vline 
WA_FISV_MREF_DOC_01_STR-ZUONR sy-vline 
WA_FISV_MREF_DOC_01_STR-USNAM sy-vline 
WA_FISV_MREF_DOC_01_STR-BSCHL sy-vline 
WA_FISV_MREF_DOC_01_STR-HSL sy-vline 
WA_FISV_MREF_DOC_01_STR-RHCUR sy-vline 
WA_FISV_MREF_DOC_01_STR-WSL sy-vline 
WA_FISV_MREF_DOC_01_STR-RWCUR sy-vline 
WA_FISV_MREF_DOC_01_STR-AMOUNTINFUNCTIONALCURRENCY sy-vline 
WA_FISV_MREF_DOC_01_STR-FUNCTIONALCURRENCY sy-vline 
WA_FISV_MREF_DOC_01_STR-KTOPL sy-vline 
WA_FISV_MREF_DOC_01_STR-RACCT sy-vline 
WA_FISV_MREF_DOC_01_STR-UMSKZ sy-vline 
WA_FISV_MREF_DOC_01_STR-WAKONTO sy-vline 
WA_FISV_MREF_DOC_01_STR-STBLG sy-vline 
WA_FISV_MREF_DOC_01_STR-STGRD sy-vline      INTO ld_text SEPARATED BY SPACE.

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