ABAP Select data from SAP table CSITNRELSIT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CSITNRELSIT
*  INTO TABLE @DATA(IT_CSITNRELSIT2).
*--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_CSITNRELSIT INDEX 1 INTO DATA(WA_CSITNRELSIT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CSITNRELSIT>-MANDT = 1.
<CSITNRELSIT>-SITNINSTANCEID = 1.
<CSITNRELSIT>-SITNDEFRELATEDOBJECTID = 1.
<CSITNRELSIT>-SITNDEFINITIONID = 1.
<CSITNRELSIT>-SITNINSTCERELTDOBJKEY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CSITNRELSIT-SITNDEFRELTDOBJSOT, sy-vline,
  WA_CSITNRELSIT-SITNDEFRELTDOBJSONT, sy-vline,
  WA_CSITNRELSIT-SITNINSTCEANCHOROBJECTKEY, sy-vline,
  WA_CSITNRELSIT-SITNANCHOROBJECTREADABLEID, sy-vline,
  WA_CSITNRELSIT-CREATIONDATETIME, sy-vline,
  WA_CSITNRELSIT-SITNDEFANCHOROBJECTDESC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CSITNRELSIT 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_CSITNRELSIT 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_CSITNRELSIT INTO WA_CSITNRELSIT.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_CSITNRELSIT_STR, 
MANDT TYPE STRING,
SITNINSTANCEID TYPE STRING,
SITNDEFRELATEDOBJECTID TYPE STRING,
SITNDEFINITIONID TYPE STRING,
SITNINSTCERELTDOBJKEY TYPE STRING,
SITNDEFRELTDOBJSOT TYPE STRING,
SITNDEFRELTDOBJSONT TYPE STRING,
SITNINSTCEANCHOROBJECTKEY TYPE STRING,
SITNANCHOROBJECTREADABLEID TYPE STRING,
CREATIONDATETIME TYPE STRING,
SITNDEFANCHOROBJECTDESC TYPE STRING,
SITNDEFSHORTTEXT TYPE STRING,
SITNDEFANCHOROBJECTVIEW TYPE STRING,
SITNDEFANCHOROBJECT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CSITNRELSIT_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_CSITNRELSIT_STR-MANDT sy-vline 
WA_CSITNRELSIT_STR-SITNINSTANCEID sy-vline 
WA_CSITNRELSIT_STR-SITNDEFRELATEDOBJECTID sy-vline 
WA_CSITNRELSIT_STR-SITNDEFINITIONID sy-vline 
WA_CSITNRELSIT_STR-SITNINSTCERELTDOBJKEY sy-vline 
WA_CSITNRELSIT_STR-SITNDEFRELTDOBJSOT sy-vline 
WA_CSITNRELSIT_STR-SITNDEFRELTDOBJSONT sy-vline 
WA_CSITNRELSIT_STR-SITNINSTCEANCHOROBJECTKEY sy-vline 
WA_CSITNRELSIT_STR-SITNANCHOROBJECTREADABLEID sy-vline 
WA_CSITNRELSIT_STR-CREATIONDATETIME sy-vline 
WA_CSITNRELSIT_STR-SITNDEFANCHOROBJECTDESC sy-vline 
WA_CSITNRELSIT_STR-SITNDEFSHORTTEXT sy-vline 
WA_CSITNRELSIT_STR-SITNDEFANCHOROBJECTVIEW sy-vline 
WA_CSITNRELSIT_STR-SITNDEFANCHOROBJECT sy-vline      INTO ld_text SEPARATED BY SPACE.

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