ABAP Select data from SAP table AVITMNTRULEDR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AVITMNTRULEDR
*  INTO TABLE @DATA(IT_AVITMNTRULEDR2).
*--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_AVITMNTRULEDR INDEX 1 INTO DATA(WA_AVITMNTRULEDR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AVITMNTRULEDR>-MANDT = 1.
<AVITMNTRULEDR>-INTRENO = 1.
<AVITMNTRULEDR>-TERMTYPE = 1.
<AVITMNTRULEDR>-TERMNO = 1.
<AVITMNTRULEDR>-NTRULE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AVITMNTRULEDR-NTRULENO, sy-vline,
  WA_AVITMNTRULEDR-NTLIMITYEARS, sy-vline,
  WA_AVITMNTRULEDR-NTLIMITMONTHS, sy-vline,
  WA_AVITMNTRULEDR-NTLIMITDAYS, sy-vline,
  WA_AVITMNTRULEDR-NTRECYEAR, sy-vline,
  WA_AVITMNTRULEDR-NTRECMONTH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AVITMNTRULEDR 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_AVITMNTRULEDR 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_AVITMNTRULEDR INTO WA_AVITMNTRULEDR.


*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 TERMNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_AVITMNTRULEDR-TERMNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AVITMNTRULEDR-TERMNO.
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_AVITMNTRULEDR_STR, 
MANDT TYPE STRING,
INTRENO TYPE STRING,
TERMTYPE TYPE STRING,
TERMNO TYPE STRING,
NTRULE TYPE STRING,
NTRULENO TYPE STRING,
NTLIMITYEARS TYPE STRING,
NTLIMITMONTHS TYPE STRING,
NTLIMITDAYS TYPE STRING,
NTRECYEAR TYPE STRING,
NTRECMONTH TYPE STRING,
NTRECDAY TYPE STRING,
NTRECCDWD TYPE STRING,
NTRECCALENDAR TYPE STRING,
NTNOTYEAR TYPE STRING,
NTNOTMONTH TYPE STRING,
NTNOTDAY TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AVITMNTRULEDR_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_AVITMNTRULEDR_STR-MANDT sy-vline 
WA_AVITMNTRULEDR_STR-INTRENO sy-vline 
WA_AVITMNTRULEDR_STR-TERMTYPE sy-vline 
WA_AVITMNTRULEDR_STR-TERMNO sy-vline 
WA_AVITMNTRULEDR_STR-NTRULE sy-vline 
WA_AVITMNTRULEDR_STR-NTRULENO sy-vline 
WA_AVITMNTRULEDR_STR-NTLIMITYEARS sy-vline 
WA_AVITMNTRULEDR_STR-NTLIMITMONTHS sy-vline 
WA_AVITMNTRULEDR_STR-NTLIMITDAYS sy-vline 
WA_AVITMNTRULEDR_STR-NTRECYEAR sy-vline 
WA_AVITMNTRULEDR_STR-NTRECMONTH sy-vline 
WA_AVITMNTRULEDR_STR-NTRECDAY sy-vline 
WA_AVITMNTRULEDR_STR-NTRECCDWD sy-vline 
WA_AVITMNTRULEDR_STR-NTRECCALENDAR sy-vline 
WA_AVITMNTRULEDR_STR-NTNOTYEAR sy-vline 
WA_AVITMNTRULEDR_STR-NTNOTMONTH sy-vline 
WA_AVITMNTRULEDR_STR-NTNOTDAY sy-vline 
WA_AVITMNTRULEDR_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.