ABAP Select data from SAP table RNKAV1 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 RNKAV1 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 RNKAV1. 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 RNKAV1 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_RNKAV1 TYPE STANDARD TABLE OF RNKAV1,
      WA_RNKAV1 TYPE RNKAV1,
      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: <RNKAV1> TYPE RNKAV1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNKAV1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNKAV1
  INTO TABLE IT_RNKAV1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNKAV1
*  INTO TABLE @DATA(IT_RNKAV12).
*--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_RNKAV1 INDEX 1 INTO DATA(WA_RNKAV12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNKAV1 ASSIGNING <RNKAV1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNKAV1>-MANDT = 1.
<RNKAV1>-DOKAR = 1.
<RNKAV1>-DOKNR = 1.
<RNKAV1>-DOKVR = 1.
<RNKAV1>-DOKTL = 1.

ENDLOOP.

LOOP AT IT_RNKAV1 INTO WA_RNKAV1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNKAV1-ENTLEIHER, sy-vline,
  WA_RNKAV1-ENTLTYP, sy-vline,
  WA_RNKAV1-LEIHDAT, sy-vline,
  WA_RNKAV1-LEIZEIT, sy-vline,
  WA_RNKAV1-ORGKR, sy-vline,
  WA_RNKAV1-ENTZW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNKAV1 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_RNKAV1 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_RNKAV1 INTO WA_RNKAV1.


*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 DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-DOKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ENTLEIHER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-ENTLEIHER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-ENTLEIHER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ENTLTYP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-ENTLTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-ENTLTYP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORGKR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-ORGKR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-ORGKR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ENTZW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-ENTZW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-ENTZW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VERANTW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-VERANTW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-VERANTW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-PATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORGFA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-ORGFA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-ORGFA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORGPF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-ORGPF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-ORGPF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORGDO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-ORGDO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-ORGDO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ARCHIV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-ARCHIV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-ARCHIV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STANDORT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNKAV1-STANDORT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNKAV1-STANDORT.
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_RNKAV1_STR, 
MANDT TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKVR TYPE STRING,
DOKTL TYPE STRING,
ENTLEIHER TYPE STRING,
ENTLTYP TYPE STRING,
LEIHDAT TYPE STRING,
LEIZEIT TYPE STRING,
ORGKR TYPE STRING,
ENTZW TYPE STRING,
RUEKDAT TYPE STRING,
STATUS TYPE STRING,
ANZMAH TYPE STRING,
ERMAHN TYPE STRING,
LEMAHN TYPE STRING,
ENTTEXT TYPE STRING,
LGTXT TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
ENTLEND TYPE STRING,
VERANTW TYPE STRING,
ERTIM TYPE STRING,
FILEMR TYPE STRING,
ORGFORM TYPE STRING,
EINRI TYPE STRING,
PATNR TYPE STRING,
FALNR TYPE STRING,
FALAR TYPE STRING,
ORGFA TYPE STRING,
ORGPF TYPE STRING,
ORGDO TYPE STRING,
ARCHIV TYPE STRING,
STANDORT TYPE STRING,
ROLLNO TYPE STRING,
MICROF TYPE STRING,
EXTNR TYPE STRING,
SORTMR TYPE STRING,
INFOMR TYPE STRING,
TEMPMR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNKAV1_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_RNKAV1_STR-MANDT sy-vline 
WA_RNKAV1_STR-DOKAR sy-vline 
WA_RNKAV1_STR-DOKNR sy-vline 
WA_RNKAV1_STR-DOKVR sy-vline 
WA_RNKAV1_STR-DOKTL sy-vline 
WA_RNKAV1_STR-ENTLEIHER sy-vline 
WA_RNKAV1_STR-ENTLTYP sy-vline 
WA_RNKAV1_STR-LEIHDAT sy-vline 
WA_RNKAV1_STR-LEIZEIT sy-vline 
WA_RNKAV1_STR-ORGKR sy-vline 
WA_RNKAV1_STR-ENTZW sy-vline 
WA_RNKAV1_STR-RUEKDAT sy-vline 
WA_RNKAV1_STR-STATUS sy-vline 
WA_RNKAV1_STR-ANZMAH sy-vline 
WA_RNKAV1_STR-ERMAHN sy-vline 
WA_RNKAV1_STR-LEMAHN sy-vline 
WA_RNKAV1_STR-ENTTEXT sy-vline 
WA_RNKAV1_STR-LGTXT sy-vline 
WA_RNKAV1_STR-ERDAT sy-vline 
WA_RNKAV1_STR-ERUSR sy-vline 
WA_RNKAV1_STR-UPDAT sy-vline 
WA_RNKAV1_STR-UPUSR sy-vline 
WA_RNKAV1_STR-ENTLEND sy-vline 
WA_RNKAV1_STR-VERANTW sy-vline 
WA_RNKAV1_STR-ERTIM sy-vline 
WA_RNKAV1_STR-FILEMR sy-vline 
WA_RNKAV1_STR-ORGFORM sy-vline 
WA_RNKAV1_STR-EINRI sy-vline 
WA_RNKAV1_STR-PATNR sy-vline 
WA_RNKAV1_STR-FALNR sy-vline 
WA_RNKAV1_STR-FALAR sy-vline 
WA_RNKAV1_STR-ORGFA sy-vline 
WA_RNKAV1_STR-ORGPF sy-vline 
WA_RNKAV1_STR-ORGDO sy-vline 
WA_RNKAV1_STR-ARCHIV sy-vline 
WA_RNKAV1_STR-STANDORT sy-vline 
WA_RNKAV1_STR-ROLLNO sy-vline 
WA_RNKAV1_STR-MICROF sy-vline 
WA_RNKAV1_STR-EXTNR sy-vline 
WA_RNKAV1_STR-SORTMR sy-vline 
WA_RNKAV1_STR-INFOMR sy-vline 
WA_RNKAV1_STR-TEMPMR sy-vline      INTO ld_text SEPARATED BY SPACE.

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