ABAP Select data from SAP table AVICNRN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AVICNRN
*  INTO TABLE @DATA(IT_AVICNRN2).
*--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_AVICNRN INDEX 1 INTO DATA(WA_AVICNRN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AVICNRN>-MANDT = 1.
<AVICNRN>-INTRENO = 1.
<AVICNRN>-RNNO = 1.
<AVICNRN>-RNRULETYPE = 1.
<AVICNRN>-RNENDOLD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AVICNRN-RNNOTDATE, sy-vline,
  WA_AVICNRN-RNENDNEW, sy-vline,
  WA_AVICNRN-RNACTIVE, sy-vline,
  WA_AVICNRN-RNACTIVATEDON, sy-vline,
  WA_AVICNRN-RNREVERSEDON, sy-vline,
  WA_AVICNRN-RERF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AVICNRN 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_AVICNRN 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_AVICNRN INTO WA_AVICNRN.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_AVICNRN_STR, 
MANDT TYPE STRING,
INTRENO TYPE STRING,
RNNO TYPE STRING,
RNRULETYPE TYPE STRING,
RNENDOLD TYPE STRING,
RNNOTDATE TYPE STRING,
RNENDNEW TYPE STRING,
RNACTIVE TYPE STRING,
RNACTIVATEDON TYPE STRING,
RNREVERSEDON TYPE STRING,
RERF TYPE STRING,
DERF TYPE STRING,
TERF TYPE STRING,
REHER TYPE STRING,
RBEAR TYPE STRING,
DBEAR TYPE STRING,
TBEAR TYPE STRING,
RBHER TYPE STRING,
RNDECISION TYPE STRING,
RNDECISIONON TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AVICNRN_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_AVICNRN_STR-MANDT sy-vline 
WA_AVICNRN_STR-INTRENO sy-vline 
WA_AVICNRN_STR-RNNO sy-vline 
WA_AVICNRN_STR-RNRULETYPE sy-vline 
WA_AVICNRN_STR-RNENDOLD sy-vline 
WA_AVICNRN_STR-RNNOTDATE sy-vline 
WA_AVICNRN_STR-RNENDNEW sy-vline 
WA_AVICNRN_STR-RNACTIVE sy-vline 
WA_AVICNRN_STR-RNACTIVATEDON sy-vline 
WA_AVICNRN_STR-RNREVERSEDON sy-vline 
WA_AVICNRN_STR-RERF sy-vline 
WA_AVICNRN_STR-DERF sy-vline 
WA_AVICNRN_STR-TERF sy-vline 
WA_AVICNRN_STR-REHER sy-vline 
WA_AVICNRN_STR-RBEAR sy-vline 
WA_AVICNRN_STR-DBEAR sy-vline 
WA_AVICNRN_STR-TBEAR sy-vline 
WA_AVICNRN_STR-RBHER sy-vline 
WA_AVICNRN_STR-RNDECISION sy-vline 
WA_AVICNRN_STR-RNDECISIONON sy-vline 
WA_AVICNRN_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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