ABAP Select data from SAP table /TDAG/RCSS_EXP_ALL_CLASS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /TDAG/RCSS_EXP_ALL_CLASS 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 /TDAG/RCSS_EXP_ALL_CLASS. 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 /TDAG/RCSS_EXP_ALL_CLASS 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_/TDAG/RCSS_EXP_ALL_CLASS TYPE STANDARD TABLE OF /TDAG/RCSS_EXP_ALL_CLASS,
      WA_/TDAG/RCSS_EXP_ALL_CLASS TYPE /TDAG/RCSS_EXP_ALL_CLASS,
      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: </TDAG/RCSS_EXP_ALL_CLASS> TYPE /TDAG/RCSS_EXP_ALL_CLASS.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /TDAG/RCSS_EXP_ALL_CLASS
  INTO TABLE IT_/TDAG/RCSS_EXP_ALL_CLASS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /TDAG/RCSS_EXP_ALL_CLASS
*  INTO TABLE @DATA(IT_/TDAG/RCSS_EXP_ALL_CLASS2).
*--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_/TDAG/RCSS_EXP_ALL_CLASS INDEX 1 INTO DATA(WA_/TDAG/RCSS_EXP_ALL_CLASS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/TDAG/RCSS_EXP_ALL_CLASS ASSIGNING </TDAG/RCSS_EXP_ALL_CLASS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</TDAG/RCSS_EXP_ALL_CLASS>-RECN = 1.
</TDAG/RCSS_EXP_ALL_CLASS>-SUBID = 1.
</TDAG/RCSS_EXP_ALL_CLASS>-SUBNAME = 1.
</TDAG/RCSS_EXP_ALL_CLASS>-CASNR = 1.
</TDAG/RCSS_EXP_ALL_CLASS>-ECNR = 1.

ENDLOOP.

LOOP AT IT_/TDAG/RCSS_EXP_ALL_CLASS INTO WA_/TDAG/RCSS_EXP_ALL_CLASS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/TDAG/RCSS_EXP_ALL_CLASS-RSAG, sy-vline,
  WA_/TDAG/RCSS_EXP_ALL_CLASS-REG_BASE, sy-vline,
  WA_/TDAG/RCSS_EXP_ALL_CLASS-REG_LIST, sy-vline,
  WA_/TDAG/RCSS_EXP_ALL_CLASS-REVISION, sy-vline,
  WA_/TDAG/RCSS_EXP_ALL_CLASS-CAT_DANG, sy-vline,
  WA_/TDAG/RCSS_EXP_ALL_CLASS-SYMBOL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/TDAG/RCSS_EXP_ALL_CLASS 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_/TDAG/RCSS_EXP_ALL_CLASS 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_/TDAG/RCSS_EXP_ALL_CLASS INTO WA_/TDAG/RCSS_EXP_ALL_CLASS.


*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_/TDAG/RCSS_EXP_ALL_CLASS-RECN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TDAG/RCSS_EXP_ALL_CLASS-RECN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SPEC1, internal->external for field SUBID
CALL FUNCTION 'CONVERSION_EXIT_SPEC1_OUTPUT'
  EXPORTING
    input =                      WA_/TDAG/RCSS_EXP_ALL_CLASS-SUBID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TDAG/RCSS_EXP_ALL_CLASS-SUBID.
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_/TDAG/RCSS_EXP_ALL_CLASS_STR, 
RECN TYPE STRING,
SUBID TYPE STRING,
SUBNAME TYPE STRING,
CASNR TYPE STRING,
ECNR TYPE STRING,
RSAG TYPE STRING,
REG_BASE TYPE STRING,
REG_LIST TYPE STRING,
REVISION TYPE STRING,
CAT_DANG TYPE STRING,
SYMBOL TYPE STRING,
R_PHRASE TYPE STRING,
ADD_INFO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/TDAG/RCSS_EXP_ALL_CLASS_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_/TDAG/RCSS_EXP_ALL_CLASS_STR-RECN sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-SUBID sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-SUBNAME sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-CASNR sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-ECNR sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-RSAG sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-REG_BASE sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-REG_LIST sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-REVISION sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-CAT_DANG sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-SYMBOL sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-R_PHRASE sy-vline 
WA_/TDAG/RCSS_EXP_ALL_CLASS_STR-ADD_INFO sy-vline      INTO ld_text SEPARATED BY SPACE.

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