ABAP Select data from SAP table RNKAV2 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNKAV2 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 RNKAV2. 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 RNKAV2 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_RNKAV2 TYPE STANDARD TABLE OF RNKAV2,
      WA_RNKAV2 TYPE RNKAV2,
      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: <RNKAV2> TYPE RNKAV2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNKAV2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNKAV2
  INTO TABLE IT_RNKAV2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNKAV2
*  INTO TABLE @DATA(IT_RNKAV22).
*--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_RNKAV2 INDEX 1 INTO DATA(WA_RNKAV22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNKAV2 ASSIGNING <RNKAV2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNKAV2>-MANDT = 1.
<RNKAV2>-EINRI = 1.
<RNKAV2>-PATNR = 1.
<RNKAV2>-FALNR = 1.
<RNKAV2>-LFDNR = 1.

ENDLOOP.

LOOP AT IT_RNKAV2 INTO WA_RNKAV2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNKAV2-TYP, sy-vline,
  WA_RNKAV2-DOKAR, sy-vline,
  WA_RNKAV2-DOKNR, sy-vline,
  WA_RNKAV2-DOKVR, sy-vline,
  WA_RNKAV2-DOKTL, sy-vline,
  WA_RNKAV2-ERDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNKAV2 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_RNKAV2 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_RNKAV2 INTO WA_RNKAV2.


*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 EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV2-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV2-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV2-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV2-PATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV2-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV2-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV2-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV2-DOKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORGFA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV2-ORGFA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV2-ORGFA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORGPF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV2-ORGPF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV2-ORGPF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ZIMMR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV2-ZIMMR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV2-ZIMMR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BARZT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV2-BARZT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV2-BARZT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PERNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV2-PERNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV2-PERNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TMNID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV2-TMNID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV2-TMNID.
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_RNKAV2_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
PATNR TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
TYP TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKVR TYPE STRING,
DOKTL TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
USER1 TYPE STRING,
BEWTY TYPE STRING,
STORN TYPE STRING,
BWART TYPE STRING,
BWIDT TYPE STRING,
BWIZT TYPE STRING,
PLANB TYPE STRING,
BWEDT TYPE STRING,
BWEZT TYPE STRING,
LFDREF TYPE STRING,
ORGFA TYPE STRING,
ORGPF TYPE STRING,
KZTXT TYPE STRING,
FALAR TYPE STRING,
FZIFF TYPE STRING,
GSCHL TYPE STRING,
NNAME TYPE STRING,
VNAME TYPE STRING,
NNAMS TYPE STRING,
VNAMS TYPE STRING,
TITEL TYPE STRING,
NAMZU TYPE STRING,
VORSW TYPE STRING,
GBDAT TYPE STRING,
PZIFF TYPE STRING,
EXTNR TYPE STRING,
ZIMMR TYPE STRING,
BARZT TYPE STRING,
PERNR TYPE STRING,
STATU TYPE STRING,
TMNID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNKAV2_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_RNKAV2_STR-MANDT sy-vline 
WA_RNKAV2_STR-EINRI sy-vline 
WA_RNKAV2_STR-PATNR sy-vline 
WA_RNKAV2_STR-FALNR sy-vline 
WA_RNKAV2_STR-LFDNR sy-vline 
WA_RNKAV2_STR-TYP sy-vline 
WA_RNKAV2_STR-DOKAR sy-vline 
WA_RNKAV2_STR-DOKNR sy-vline 
WA_RNKAV2_STR-DOKVR sy-vline 
WA_RNKAV2_STR-DOKTL sy-vline 
WA_RNKAV2_STR-ERDAT sy-vline 
WA_RNKAV2_STR-ERTIM sy-vline 
WA_RNKAV2_STR-USER1 sy-vline 
WA_RNKAV2_STR-BEWTY sy-vline 
WA_RNKAV2_STR-STORN sy-vline 
WA_RNKAV2_STR-BWART sy-vline 
WA_RNKAV2_STR-BWIDT sy-vline 
WA_RNKAV2_STR-BWIZT sy-vline 
WA_RNKAV2_STR-PLANB sy-vline 
WA_RNKAV2_STR-BWEDT sy-vline 
WA_RNKAV2_STR-BWEZT sy-vline 
WA_RNKAV2_STR-LFDREF sy-vline 
WA_RNKAV2_STR-ORGFA sy-vline 
WA_RNKAV2_STR-ORGPF sy-vline 
WA_RNKAV2_STR-KZTXT sy-vline 
WA_RNKAV2_STR-FALAR sy-vline 
WA_RNKAV2_STR-FZIFF sy-vline 
WA_RNKAV2_STR-GSCHL sy-vline 
WA_RNKAV2_STR-NNAME sy-vline 
WA_RNKAV2_STR-VNAME sy-vline 
WA_RNKAV2_STR-NNAMS sy-vline 
WA_RNKAV2_STR-VNAMS sy-vline 
WA_RNKAV2_STR-TITEL sy-vline 
WA_RNKAV2_STR-NAMZU sy-vline 
WA_RNKAV2_STR-VORSW sy-vline 
WA_RNKAV2_STR-GBDAT sy-vline 
WA_RNKAV2_STR-PZIFF sy-vline 
WA_RNKAV2_STR-EXTNR sy-vline 
WA_RNKAV2_STR-ZIMMR sy-vline 
WA_RNKAV2_STR-BARZT sy-vline 
WA_RNKAV2_STR-PERNR sy-vline 
WA_RNKAV2_STR-STATU sy-vline 
WA_RNKAV2_STR-TMNID sy-vline      INTO ld_text SEPARATED BY SPACE.

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