ABAP Select data from SAP table RL310_LIGHTS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RL310_LIGHTS 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 RL310_LIGHTS. 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 RL310_LIGHTS 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_RL310_LIGHTS TYPE STANDARD TABLE OF RL310_LIGHTS,
      WA_RL310_LIGHTS TYPE RL310_LIGHTS,
      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: <RL310_LIGHTS> TYPE RL310_LIGHTS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RL310_LIGHTS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RL310_LIGHTS
  INTO TABLE IT_RL310_LIGHTS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RL310_LIGHTS
*  INTO TABLE @DATA(IT_RL310_LIGHTS2).
*--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_RL310_LIGHTS INDEX 1 INTO DATA(WA_RL310_LIGHTS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RL310_LIGHTS ASSIGNING <RL310_LIGHTS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RL310_LIGHTS>-LIGHTS = 1.
<RL310_LIGHTS>-MATNR = 1.
<RL310_LIGHTS>-MHDRZ = 1.
<RL310_LIGHTS>-MHDRZ_TOTAL = 1.
<RL310_LIGHTS>-VFDAT = 1.

ENDLOOP.

LOOP AT IT_RL310_LIGHTS INTO WA_RL310_LIGHTS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RL310_LIGHTS-MHDRZ_WHSE, sy-vline,
  WA_RL310_LIGHTS-MHDRZGE, sy-vline,
  WA_RL310_LIGHTS-MHDLG, sy-vline,
  WA_RL310_LIGHTS-LGORT, sy-vline,
  WA_RL310_LIGHTS-LGTYP, sy-vline,
  WA_RL310_LIGHTS-LTYPT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RL310_LIGHTS 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_RL310_LIGHTS 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_RL310_LIGHTS INTO WA_RL310_LIGHTS.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RL310_LIGHTS-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RL310_LIGHTS-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LENUM, internal->external for field LENUM
CALL FUNCTION 'CONVERSION_EXIT_LENUM_OUTPUT'
  EXPORTING
    input =                      WA_RL310_LIGHTS-LENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RL310_LIGHTS-LENUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RL310_LIGHTS-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RL310_LIGHTS-MEINS.
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_RL310_LIGHTS_STR, 
LIGHTS TYPE STRING,
MATNR TYPE STRING,
MHDRZ TYPE STRING,
MHDRZ_TOTAL TYPE STRING,
VFDAT TYPE STRING,
MHDRZ_WHSE TYPE STRING,
MHDRZGE TYPE STRING,
MHDLG TYPE STRING,
LGORT TYPE STRING,
LGTYP TYPE STRING,
LTYPT TYPE STRING,
LGPLA TYPE STRING,
LENUM TYPE STRING,
BESTQ TYPE STRING,
SOBKZ TYPE STRING,
GESME TYPE STRING,
MEINS TYPE STRING,
WERKS TYPE STRING,
CHARG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RL310_LIGHTS_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_RL310_LIGHTS_STR-LIGHTS sy-vline 
WA_RL310_LIGHTS_STR-MATNR sy-vline 
WA_RL310_LIGHTS_STR-MHDRZ sy-vline 
WA_RL310_LIGHTS_STR-MHDRZ_TOTAL sy-vline 
WA_RL310_LIGHTS_STR-VFDAT sy-vline 
WA_RL310_LIGHTS_STR-MHDRZ_WHSE sy-vline 
WA_RL310_LIGHTS_STR-MHDRZGE sy-vline 
WA_RL310_LIGHTS_STR-MHDLG sy-vline 
WA_RL310_LIGHTS_STR-LGORT sy-vline 
WA_RL310_LIGHTS_STR-LGTYP sy-vline 
WA_RL310_LIGHTS_STR-LTYPT sy-vline 
WA_RL310_LIGHTS_STR-LGPLA sy-vline 
WA_RL310_LIGHTS_STR-LENUM sy-vline 
WA_RL310_LIGHTS_STR-BESTQ sy-vline 
WA_RL310_LIGHTS_STR-SOBKZ sy-vline 
WA_RL310_LIGHTS_STR-GESME sy-vline 
WA_RL310_LIGHTS_STR-MEINS sy-vline 
WA_RL310_LIGHTS_STR-WERKS sy-vline 
WA_RL310_LIGHTS_STR-CHARG sy-vline      INTO ld_text SEPARATED BY SPACE.

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