ABAP Select data from SAP table AVILMPEER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AVILMPEER
*  INTO TABLE @DATA(IT_AVILMPEER2).
*--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_AVILMPEER INDEX 1 INTO DATA(WA_AVILMPEER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AVILMPEER>-MANDT = 1.
<AVILMPEER>-INTRENO = 1.
<AVILMPEER>-PEERNO = 1.
<AVILMPEER>-PEERSUBNO = 1.
<AVILMPEER>-PEERPAGE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AVILMPEER-PEERTYPE, sy-vline,
  WA_AVILMPEER-PEREGDATE, sy-vline,
  WA_AVILMPEER-PECHGDATE, sy-vline,
  WA_AVILMPEER-PEERCHGNO, sy-vline,
  WA_AVILMPEER-PEERCHGSUBNO, sy-vline,
  WA_AVILMPEER-PEDELDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AVILMPEER 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_AVILMPEER 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_AVILMPEER INTO WA_AVILMPEER.


*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 REDAT, internal->external for field PEDELDATE
CALL FUNCTION 'CONVERSION_EXIT_REDAT_OUTPUT'
  EXPORTING
    input =                      WA_AVILMPEER-PEDELDATE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AVILMPEER-PEDELDATE.
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_AVILMPEER_STR, 
MANDT TYPE STRING,
INTRENO TYPE STRING,
PEERNO TYPE STRING,
PEERSUBNO TYPE STRING,
PEERPAGE TYPE STRING,
PEERTYPE TYPE STRING,
PEREGDATE TYPE STRING,
PECHGDATE TYPE STRING,
PEERCHGNO TYPE STRING,
PEERCHGSUBNO TYPE STRING,
PEDELDATE TYPE STRING,
OBJNRCN TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AVILMPEER_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_AVILMPEER_STR-MANDT sy-vline 
WA_AVILMPEER_STR-INTRENO sy-vline 
WA_AVILMPEER_STR-PEERNO sy-vline 
WA_AVILMPEER_STR-PEERSUBNO sy-vline 
WA_AVILMPEER_STR-PEERPAGE sy-vline 
WA_AVILMPEER_STR-PEERTYPE sy-vline 
WA_AVILMPEER_STR-PEREGDATE sy-vline 
WA_AVILMPEER_STR-PECHGDATE sy-vline 
WA_AVILMPEER_STR-PEERCHGNO sy-vline 
WA_AVILMPEER_STR-PEERCHGSUBNO sy-vline 
WA_AVILMPEER_STR-PEDELDATE sy-vline 
WA_AVILMPEER_STR-OBJNRCN sy-vline 
WA_AVILMPEER_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.