ABAP Select data from SAP table REIS_PEER_L into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REIS_PEER_L
*  INTO TABLE @DATA(IT_REIS_PEER_L2).
*--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_REIS_PEER_L INDEX 1 INTO DATA(WA_REIS_PEER_L2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REIS_PEER_L>-PEID = 1.
<REIS_PEER_L>-PEERNO = 1.
<REIS_PEER_L>-PEERSUBNO = 1.
<REIS_PEER_L>-PEERPAGE = 1.
<REIS_PEER_L>-PEERTYPE = 1.

ENDLOOP.

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

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


*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_REIS_PEER_L-PEDELDATE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REIS_PEER_L-PEDELDATE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit REDAT, internal->external for field RELVALIDTO
CALL FUNCTION 'CONVERSION_EXIT_REDAT_OUTPUT'
  EXPORTING
    input =                      WA_REIS_PEER_L-RELVALIDTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REIS_PEER_L-RELVALIDTO.
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_REIS_PEER_L_STR, 
PEID 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,
IS_SERVIENT TYPE STRING,
IS_DOMINANT TYPE STRING,
PEERICON TYPE STRING,
XPEERTYPE TYPE STRING,
PEERPAGENO TYPE STRING,
RELVALIDFROM TYPE STRING,
RELVALIDTO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REIS_PEER_L_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_REIS_PEER_L_STR-PEID sy-vline 
WA_REIS_PEER_L_STR-PEERNO sy-vline 
WA_REIS_PEER_L_STR-PEERSUBNO sy-vline 
WA_REIS_PEER_L_STR-PEERPAGE sy-vline 
WA_REIS_PEER_L_STR-PEERTYPE sy-vline 
WA_REIS_PEER_L_STR-PEREGDATE sy-vline 
WA_REIS_PEER_L_STR-PECHGDATE sy-vline 
WA_REIS_PEER_L_STR-PEERCHGNO sy-vline 
WA_REIS_PEER_L_STR-PEERCHGSUBNO sy-vline 
WA_REIS_PEER_L_STR-PEDELDATE sy-vline 
WA_REIS_PEER_L_STR-OBJNRCN sy-vline 
WA_REIS_PEER_L_STR-IS_SERVIENT sy-vline 
WA_REIS_PEER_L_STR-IS_DOMINANT sy-vline 
WA_REIS_PEER_L_STR-PEERICON sy-vline 
WA_REIS_PEER_L_STR-XPEERTYPE sy-vline 
WA_REIS_PEER_L_STR-PEERPAGENO sy-vline 
WA_REIS_PEER_L_STR-RELVALIDFROM sy-vline 
WA_REIS_PEER_L_STR-RELVALIDTO sy-vline      INTO ld_text SEPARATED BY SPACE.

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