ABAP Select data from SAP table RCGWLIOT into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RCGWLIOT 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 RCGWLIOT. 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 RCGWLIOT 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_RCGWLIOT TYPE STANDARD TABLE OF RCGWLIOT,
      WA_RCGWLIOT TYPE RCGWLIOT,
      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: <RCGWLIOT> TYPE RCGWLIOT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCGWLIOT
*  INTO TABLE @DATA(IT_RCGWLIOT2).
*--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_RCGWLIOT INDEX 1 INTO DATA(WA_RCGWLIOT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCGWLIOT>-MARKFLG = 1.
<RCGWLIOT>-SELEFLG = 1.
<RCGWLIOT>-LINENO = 1.
<RCGWLIOT>-LINEMOD = 1.
<RCGWLIOT>-CHCOFLG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCGWLIOT-LOCKMOD, sy-vline,
  WA_RCGWLIOT-INTRFLG, sy-vline,
  WA_RCGWLIOT-MANDT, sy-vline,
  WA_RCGWLIOT-RECN, sy-vline,
  WA_RCGWLIOT-ACTN, sy-vline,
  WA_RCGWLIOT-VALFR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCGWLIOT 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_RCGWLIOT 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_RCGWLIOT INTO WA_RCGWLIOT.


*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 RECN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGWLIOT-RECN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGWLIOT-RECN.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCGWLIOT-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGWLIOT-STLNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit SPEC1, internal->external for field SUBID
CALL FUNCTION 'CONVERSION_EXIT_SPEC1_OUTPUT'
  EXPORTING
    input =                      WA_RCGWLIOT-SUBID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGWLIOT-SUBID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNTRH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGWLIOT-RECNTRH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGWLIOT-RECNTRH.
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_RCGWLIOT_STR, 
MARKFLG TYPE STRING,
SELEFLG TYPE STRING,
LINENO TYPE STRING,
LINEMOD TYPE STRING,
CHCOFLG TYPE STRING,
LOCKMOD TYPE STRING,
INTRFLG TYPE STRING,
MANDT TYPE STRING,
RECN TYPE STRING,
ACTN TYPE STRING,
VALFR TYPE STRING,
VALTO TYPE STRING,
AENNR TYPE STRING,
DELFLG TYPE STRING,
PARKFLG TYPE STRING,
CRDAT TYPE STRING,
CRNAM TYPE STRING,
UPDDAT TYPE STRING,
UPDNAM TYPE STRING,
SRSID TYPE STRING,
OWNID TYPE STRING,
RECNROOT TYPE STRING,
STLTY TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
STLNR TYPE STRING,
STLAL TYPE STRING,
STLAN TYPE STRING,
STKOZ TYPE STRING,
CRTIME TYPE STRING,
UPDTIME TYPE STRING,
ERRMODE TYPE STRING,
RFCDEST TYPE STRING,
SUBID TYPE STRING,
MATL_DESC TYPE STRING,
WERK_DESC TYPE STRING,
STL_DESC TYPE STRING,
VERW_DISC TYPE STRING,
AL_DESC TYPE STRING,
MAT_ART TYPE STRING,
MAT_ART_DESC TYPE STRING,
RECNTRH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCGWLIOT_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_RCGWLIOT_STR-MARKFLG sy-vline 
WA_RCGWLIOT_STR-SELEFLG sy-vline 
WA_RCGWLIOT_STR-LINENO sy-vline 
WA_RCGWLIOT_STR-LINEMOD sy-vline 
WA_RCGWLIOT_STR-CHCOFLG sy-vline 
WA_RCGWLIOT_STR-LOCKMOD sy-vline 
WA_RCGWLIOT_STR-INTRFLG sy-vline 
WA_RCGWLIOT_STR-MANDT sy-vline 
WA_RCGWLIOT_STR-RECN sy-vline 
WA_RCGWLIOT_STR-ACTN sy-vline 
WA_RCGWLIOT_STR-VALFR sy-vline 
WA_RCGWLIOT_STR-VALTO sy-vline 
WA_RCGWLIOT_STR-AENNR sy-vline 
WA_RCGWLIOT_STR-DELFLG sy-vline 
WA_RCGWLIOT_STR-PARKFLG sy-vline 
WA_RCGWLIOT_STR-CRDAT sy-vline 
WA_RCGWLIOT_STR-CRNAM sy-vline 
WA_RCGWLIOT_STR-UPDDAT sy-vline 
WA_RCGWLIOT_STR-UPDNAM sy-vline 
WA_RCGWLIOT_STR-SRSID sy-vline 
WA_RCGWLIOT_STR-OWNID sy-vline 
WA_RCGWLIOT_STR-RECNROOT sy-vline 
WA_RCGWLIOT_STR-STLTY sy-vline 
WA_RCGWLIOT_STR-MATNR sy-vline 
WA_RCGWLIOT_STR-WERKS sy-vline 
WA_RCGWLIOT_STR-STLNR sy-vline 
WA_RCGWLIOT_STR-STLAL sy-vline 
WA_RCGWLIOT_STR-STLAN sy-vline 
WA_RCGWLIOT_STR-STKOZ sy-vline 
WA_RCGWLIOT_STR-CRTIME sy-vline 
WA_RCGWLIOT_STR-UPDTIME sy-vline 
WA_RCGWLIOT_STR-ERRMODE sy-vline 
WA_RCGWLIOT_STR-RFCDEST sy-vline 
WA_RCGWLIOT_STR-SUBID sy-vline 
WA_RCGWLIOT_STR-MATL_DESC sy-vline 
WA_RCGWLIOT_STR-WERK_DESC sy-vline 
WA_RCGWLIOT_STR-STL_DESC sy-vline 
WA_RCGWLIOT_STR-VERW_DISC sy-vline 
WA_RCGWLIOT_STR-AL_DESC sy-vline 
WA_RCGWLIOT_STR-MAT_ART sy-vline 
WA_RCGWLIOT_STR-MAT_ART_DESC sy-vline 
WA_RCGWLIOT_STR-RECNTRH sy-vline      INTO ld_text SEPARATED BY SPACE.

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