ABAP Select data from SAP table /TDAG/RCSS_LGENT 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_LGENT 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_LGENT. 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_LGENT 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_LGENT TYPE STANDARD TABLE OF /TDAG/RCSS_LGENT,
      WA_/TDAG/RCSS_LGENT TYPE /TDAG/RCSS_LGENT,
      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_LGENT> TYPE /TDAG/RCSS_LGENT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /TDAG/RCSS_LGENT
*  INTO TABLE @DATA(IT_/TDAG/RCSS_LGENT2).
*--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_LGENT INDEX 1 INTO DATA(WA_/TDAG/RCSS_LGENT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</TDAG/RCSS_LGENT>-MANDT = 1.
</TDAG/RCSS_LGENT>-BUKRS = 1.
</TDAG/RCSS_LGENT>-BUTXT = 1.
</TDAG/RCSS_LGENT>-RESP_PERNO = 1.
</TDAG/RCSS_LGENT>-COUNTRY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/TDAG/RCSS_LGENT-LEOX_UUID, sy-vline,
  WA_/TDAG/RCSS_LGENT-LEOX_DOKAR, sy-vline,
  WA_/TDAG/RCSS_LGENT-LEOX_DOKNR, sy-vline,
  WA_/TDAG/RCSS_LGENT-LEOX_DOKVR, sy-vline,
  WA_/TDAG/RCSS_LGENT-LEOX_DOKTL, sy-vline,
  WA_/TDAG/RCSS_LGENT-LEOX_DOKTX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/TDAG/RCSS_LGENT 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_LGENT 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_LGENT INTO WA_/TDAG/RCSS_LGENT.


*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 RESP_PERNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/TDAG/RCSS_LGENT-RESP_PERNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TDAG/RCSS_LGENT-RESP_PERNO.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit SXIDN, internal->external for field EMAIL
CALL FUNCTION 'CONVERSION_EXIT_SXIDN_OUTPUT'
  EXPORTING
    input =                      WA_/TDAG/RCSS_LGENT-EMAIL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TDAG/RCSS_LGENT-EMAIL.
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_LGENT_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
BUTXT TYPE STRING,
RESP_PERNO TYPE STRING,
COUNTRY TYPE STRING,
LEOX_UUID TYPE STRING,
LEOX_DOKAR TYPE STRING,
LEOX_DOKNR TYPE STRING,
LEOX_DOKVR TYPE STRING,
LEOX_DOKTL TYPE STRING,
LEOX_DOKTX TYPE STRING,
MAPPING_TXT TYPE STRING,
SLAG TYPE STRING,
FLG_IN_LEGSL TYPE STRING,
NAME2 TYPE STRING,
STREET TYPE STRING,
HOUSE_NO TYPE STRING,
POSTL_CODE TYPE STRING,
CITY TYPE STRING,
TEL_NUMBER TYPE STRING,
TEL_EXT TYPE STRING,
FAX_NUMBER TYPE STRING,
FAX_EXTENS TYPE STRING,
EMAIL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/TDAG/RCSS_LGENT_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_LGENT_STR-MANDT sy-vline 
WA_/TDAG/RCSS_LGENT_STR-BUKRS sy-vline 
WA_/TDAG/RCSS_LGENT_STR-BUTXT sy-vline 
WA_/TDAG/RCSS_LGENT_STR-RESP_PERNO sy-vline 
WA_/TDAG/RCSS_LGENT_STR-COUNTRY sy-vline 
WA_/TDAG/RCSS_LGENT_STR-LEOX_UUID sy-vline 
WA_/TDAG/RCSS_LGENT_STR-LEOX_DOKAR sy-vline 
WA_/TDAG/RCSS_LGENT_STR-LEOX_DOKNR sy-vline 
WA_/TDAG/RCSS_LGENT_STR-LEOX_DOKVR sy-vline 
WA_/TDAG/RCSS_LGENT_STR-LEOX_DOKTL sy-vline 
WA_/TDAG/RCSS_LGENT_STR-LEOX_DOKTX sy-vline 
WA_/TDAG/RCSS_LGENT_STR-MAPPING_TXT sy-vline 
WA_/TDAG/RCSS_LGENT_STR-SLAG sy-vline 
WA_/TDAG/RCSS_LGENT_STR-FLG_IN_LEGSL sy-vline 
WA_/TDAG/RCSS_LGENT_STR-NAME2 sy-vline 
WA_/TDAG/RCSS_LGENT_STR-STREET sy-vline 
WA_/TDAG/RCSS_LGENT_STR-HOUSE_NO sy-vline 
WA_/TDAG/RCSS_LGENT_STR-POSTL_CODE sy-vline 
WA_/TDAG/RCSS_LGENT_STR-CITY sy-vline 
WA_/TDAG/RCSS_LGENT_STR-TEL_NUMBER sy-vline 
WA_/TDAG/RCSS_LGENT_STR-TEL_EXT sy-vline 
WA_/TDAG/RCSS_LGENT_STR-FAX_NUMBER sy-vline 
WA_/TDAG/RCSS_LGENT_STR-FAX_EXTENS sy-vline 
WA_/TDAG/RCSS_LGENT_STR-EMAIL sy-vline      INTO ld_text SEPARATED BY SPACE.

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