ABAP Select data from SAP table REXCNLAJPERC_ALV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REXCNLAJPERC_ALV
*  INTO TABLE @DATA(IT_REXCNLAJPERC_ALV2).
*--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_REXCNLAJPERC_ALV INDEX 1 INTO DATA(WA_REXCNLAJPERC_ALV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REXCNLAJPERC_ALV>-RECORDGUID = 1.
<REXCNLAJPERC_ALV>-EXTID = 1.
<REXCNLAJPERC_ALV>-TITLE = 1.
<REXCNLAJPERC_ALV>-RECNTXT = 1.
<REXCNLAJPERC_ALV>-BUKRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REXCNLAJPERC_ALV-RECNNR, sy-vline,
  WA_REXCNLAJPERC_ALV-ADJMFROMCALC, sy-vline,
  WA_REXCNLAJPERC_ALV-UNITPRICEOLD, sy-vline,
  WA_REXCNLAJPERC_ALV-UNITPRICECALC, sy-vline,
  WA_REXCNLAJPERC_ALV-SUBSIDIZED, sy-vline,
  WA_REXCNLAJPERC_ALV-UNITPRICEMOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REXCNLAJPERC_ALV 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_REXCNLAJPERC_ALV 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_REXCNLAJPERC_ALV INTO WA_REXCNLAJPERC_ALV.


*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 RECNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REXCNLAJPERC_ALV-RECNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REXCNLAJPERC_ALV-RECNNR.
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_REXCNLAJPERC_ALV_STR, 
RECORDGUID TYPE STRING,
EXTID TYPE STRING,
TITLE TYPE STRING,
RECNTXT TYPE STRING,
BUKRS TYPE STRING,
RECNNR TYPE STRING,
ADJMFROMCALC TYPE STRING,
UNITPRICEOLD TYPE STRING,
UNITPRICECALC TYPE STRING,
SUBSIDIZED TYPE STRING,
UNITPRICEMOD TYPE STRING,
PERCENTAGE TYPE STRING,
CHANGED TYPE STRING,
STATUSNR TYPE STRING,
STATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REXCNLAJPERC_ALV_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_REXCNLAJPERC_ALV_STR-RECORDGUID sy-vline 
WA_REXCNLAJPERC_ALV_STR-EXTID sy-vline 
WA_REXCNLAJPERC_ALV_STR-TITLE sy-vline 
WA_REXCNLAJPERC_ALV_STR-RECNTXT sy-vline 
WA_REXCNLAJPERC_ALV_STR-BUKRS sy-vline 
WA_REXCNLAJPERC_ALV_STR-RECNNR sy-vline 
WA_REXCNLAJPERC_ALV_STR-ADJMFROMCALC sy-vline 
WA_REXCNLAJPERC_ALV_STR-UNITPRICEOLD sy-vline 
WA_REXCNLAJPERC_ALV_STR-UNITPRICECALC sy-vline 
WA_REXCNLAJPERC_ALV_STR-SUBSIDIZED sy-vline 
WA_REXCNLAJPERC_ALV_STR-UNITPRICEMOD sy-vline 
WA_REXCNLAJPERC_ALV_STR-PERCENTAGE sy-vline 
WA_REXCNLAJPERC_ALV_STR-CHANGED sy-vline 
WA_REXCNLAJPERC_ALV_STR-STATUSNR sy-vline 
WA_REXCNLAJPERC_ALV_STR-STATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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