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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /TDAG/RCSS_EPOBJ_LITER
*  INTO TABLE @DATA(IT_/TDAG/RCSS_EPOBJ_LITER2).
*--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_EPOBJ_LITER INDEX 1 INTO DATA(WA_/TDAG/RCSS_EPOBJ_LITER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</TDAG/RCSS_EPOBJ_LITER>-EPCODE = 1.
</TDAG/RCSS_EPOBJ_LITER>-GUID = 1.
</TDAG/RCSS_EPOBJ_LITER>-LITERAID = 1.
</TDAG/RCSS_EPOBJ_LITER>-NAME = 1.
</TDAG/RCSS_EPOBJ_LITER>-METHOD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/TDAG/RCSS_EPOBJ_LITER-RESLT, sy-vline,
  WA_/TDAG/RCSS_EPOBJ_LITER-DATE_AVAIL, sy-vline,
  WA_/TDAG/RCSS_EPOBJ_LITER-RELIABILITY, sy-vline,
  WA_/TDAG/RCSS_EPOBJ_LITER-DOKAR, sy-vline,
  WA_/TDAG/RCSS_EPOBJ_LITER-DOKNR, sy-vline,
  WA_/TDAG/RCSS_EPOBJ_LITER-DOKVR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/TDAG/RCSS_EPOBJ_LITER 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_EPOBJ_LITER 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_EPOBJ_LITER INTO WA_/TDAG/RCSS_EPOBJ_LITER.


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

*Conversion exit ALPHA, internal->external for field RECNROOT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/TDAG/RCSS_EPOBJ_LITER-RECNROOT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TDAG/RCSS_EPOBJ_LITER-RECNROOT.
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_EPOBJ_LITER_STR, 
EPCODE TYPE STRING,
GUID TYPE STRING,
LITERAID TYPE STRING,
NAME TYPE STRING,
METHOD TYPE STRING,
RESLT TYPE STRING,
DATE_AVAIL TYPE STRING,
RELIABILITY TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKVR TYPE STRING,
DOKTL TYPE STRING,
DOKTX TYPE STRING,
STATUS TYPE STRING,
GLP TYPE STRING,
YEAROFPUB TYPE STRING,
AUTHOR TYPE STRING,
PUBLISHER TYPE STRING,
KEY_STUDY TYPE STRING,
COV_REL TYPE STRING,
RECNROOT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/TDAG/RCSS_EPOBJ_LITER_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_EPOBJ_LITER_STR-EPCODE sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-GUID sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-LITERAID sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-NAME sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-METHOD sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-RESLT sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-DATE_AVAIL sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-RELIABILITY sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-DOKAR sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-DOKNR sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-DOKVR sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-DOKTL sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-DOKTX sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-STATUS sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-GLP sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-YEAROFPUB sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-AUTHOR sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-PUBLISHER sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-KEY_STUDY sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-COV_REL sy-vline 
WA_/TDAG/RCSS_EPOBJ_LITER_STR-RECNROOT sy-vline      INTO ld_text SEPARATED BY SPACE.

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