ABAP Select data from SAP table RFESR000_ALV into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFESR000_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 RFESR000_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 RFESR000_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_RFESR000_ALV TYPE STANDARD TABLE OF RFESR000_ALV,
      WA_RFESR000_ALV TYPE RFESR000_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: <RFESR000_ALV> TYPE RFESR000_ALV.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFESR000_ALV.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFESR000_ALV
  INTO TABLE IT_RFESR000_ALV.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFESR000_ALV
*  INTO TABLE @DATA(IT_RFESR000_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_RFESR000_ALV INDEX 1 INTO DATA(WA_RFESR000_ALV2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFESR000_ALV ASSIGNING <RFESR000_ALV>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFESR000_ALV>-LEAD = 1.
<RFESR000_ALV>-POR = 1.
<RFESR000_ALV>-ITEM = 1.
<RFESR000_ALV>-TYPE = 1.
<RFESR000_ALV>-COMCO = 1.

ENDLOOP.

LOOP AT IT_RFESR000_ALV INTO WA_RFESR000_ALV.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFESR000_ALV-LNR, sy-vline,
  WA_RFESR000_ALV-ESRREFNR, sy-vline,
  WA_RFESR000_ALV-ESRKUNNR, sy-vline,
  WA_RFESR000_ALV-ESRMICNR, sy-vline,
  WA_RFESR000_ALV-ESRTRNTP, sy-vline,
  WA_RFESR000_ALV-TEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFESR000_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_RFESR000_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_RFESR000_ALV INTO WA_RFESR000_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 LNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFESR000_ALV-LNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFESR000_ALV-LNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ESRREFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFESR000_ALV-ESRREFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFESR000_ALV-ESRREFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ESRKUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFESR000_ALV-ESRKUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFESR000_ALV-ESRKUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AU132, internal->external for field AMMOUNT
CALL FUNCTION 'CONVERSION_EXIT_AU132_OUTPUT'
  EXPORTING
    input =                      WA_RFESR000_ALV-AMMOUNT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFESR000_ALV-AMMOUNT.
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_RFESR000_ALV_STR, 
LEAD TYPE STRING,
POR TYPE STRING,
ITEM TYPE STRING,
TYPE TYPE STRING,
COMCO TYPE STRING,
LNR TYPE STRING,
ESRREFNR TYPE STRING,
ESRKUNNR TYPE STRING,
ESRMICNR TYPE STRING,
ESRTRNTP TYPE STRING,
TEXT TYPE STRING,
CURR TYPE STRING,
DATS TYPE STRING,
ICON TYPE STRING,
STATUS TYPE STRING,
AMMOUNT TYPE STRING,
PA TYPE STRING,
KUNNID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFESR000_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_RFESR000_ALV_STR-LEAD sy-vline 
WA_RFESR000_ALV_STR-POR sy-vline 
WA_RFESR000_ALV_STR-ITEM sy-vline 
WA_RFESR000_ALV_STR-TYPE sy-vline 
WA_RFESR000_ALV_STR-COMCO sy-vline 
WA_RFESR000_ALV_STR-LNR sy-vline 
WA_RFESR000_ALV_STR-ESRREFNR sy-vline 
WA_RFESR000_ALV_STR-ESRKUNNR sy-vline 
WA_RFESR000_ALV_STR-ESRMICNR sy-vline 
WA_RFESR000_ALV_STR-ESRTRNTP sy-vline 
WA_RFESR000_ALV_STR-TEXT sy-vline 
WA_RFESR000_ALV_STR-CURR sy-vline 
WA_RFESR000_ALV_STR-DATS sy-vline 
WA_RFESR000_ALV_STR-ICON sy-vline 
WA_RFESR000_ALV_STR-STATUS sy-vline 
WA_RFESR000_ALV_STR-AMMOUNT sy-vline 
WA_RFESR000_ALV_STR-PA sy-vline 
WA_RFESR000_ALV_STR-KUNNID sy-vline      INTO ld_text SEPARATED BY SPACE.

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