ABAP Select data from SAP table BAPI_RE_OBJ_ASSIGN_DATC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BAPI_RE_OBJ_ASSIGN_DATC
*  INTO TABLE @DATA(IT_BAPI_RE_OBJ_ASSIGN_DATC2).
*--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_BAPI_RE_OBJ_ASSIGN_DATC INDEX 1 INTO DATA(WA_BAPI_RE_OBJ_ASSIGN_DATC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BAPI_RE_OBJ_ASSIGN_DATC>-CHANGE_INDICATOR = 1.
<BAPI_RE_OBJ_ASSIGN_DATC>-ASSIGNMNT_OBJECT_TYPE = 1.
<BAPI_RE_OBJ_ASSIGN_DATC>-ASSIGNMNT_OBJECT_ID = 1.
<BAPI_RE_OBJ_ASSIGN_DATC>-VALID_FROM = 1.
<BAPI_RE_OBJ_ASSIGN_DATC>-VALID_TO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BAPI_RE_OBJ_ASSIGN_DATC-IS_MAIN_ASSET, sy-vline,
  WA_BAPI_RE_OBJ_ASSIGN_DATC-MEAS_VALUE, sy-vline,
  WA_BAPI_RE_OBJ_ASSIGN_DATC-UNIT, sy-vline,
  WA_BAPI_RE_OBJ_ASSIGN_DATC-UNIT_ISO, sy-vline,
  WA_BAPI_RE_OBJ_ASSIGN_DATC-RELEVANT_FOR_OPTRATE, sy-vline,
  WA_BAPI_RE_OBJ_ASSIGN_DATC-PLANNING_DATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BAPI_RE_OBJ_ASSIGN_DATC 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_BAPI_RE_OBJ_ASSIGN_DATC 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_BAPI_RE_OBJ_ASSIGN_DATC INTO WA_BAPI_RE_OBJ_ASSIGN_DATC.


*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 REDAT, internal->external for field VALID_TO
CALL FUNCTION 'CONVERSION_EXIT_REDAT_OUTPUT'
  EXPORTING
    input =                      WA_BAPI_RE_OBJ_ASSIGN_DATC-VALID_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPI_RE_OBJ_ASSIGN_DATC-VALID_TO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_BAPI_RE_OBJ_ASSIGN_DATC-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPI_RE_OBJ_ASSIGN_DATC-UNIT.
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_BAPI_RE_OBJ_ASSIGN_DATC_STR, 
CHANGE_INDICATOR TYPE STRING,
ASSIGNMNT_OBJECT_TYPE TYPE STRING,
ASSIGNMNT_OBJECT_ID TYPE STRING,
VALID_FROM TYPE STRING,
VALID_TO TYPE STRING,
IS_MAIN_ASSET TYPE STRING,
MEAS_VALUE TYPE STRING,
UNIT TYPE STRING,
UNIT_ISO TYPE STRING,
RELEVANT_FOR_OPTRATE TYPE STRING,
PLANNING_DATE TYPE STRING,
EFFECTIVE_DATE TYPE STRING,
LOCATION TYPE STRING,
ASSIGNMNT_TYPE TYPE STRING,
FUNC_LOC_GENERATION_TYPE TYPE STRING,
INFORMATIONAL_ASSIGNMENT TYPE STRING,
IS_LEADING_OBJECT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BAPI_RE_OBJ_ASSIGN_DATC_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_BAPI_RE_OBJ_ASSIGN_DATC_STR-CHANGE_INDICATOR sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-ASSIGNMNT_OBJECT_TYPE sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-ASSIGNMNT_OBJECT_ID sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-VALID_FROM sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-VALID_TO sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-IS_MAIN_ASSET sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-MEAS_VALUE sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-UNIT sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-UNIT_ISO sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-RELEVANT_FOR_OPTRATE sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-PLANNING_DATE sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-EFFECTIVE_DATE sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-LOCATION sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-ASSIGNMNT_TYPE sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-FUNC_LOC_GENERATION_TYPE sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-INFORMATIONAL_ASSIGNMENT sy-vline 
WA_BAPI_RE_OBJ_ASSIGN_DATC_STR-IS_LEADING_OBJECT sy-vline      INTO ld_text SEPARATED BY SPACE.

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