ABAP Select data from SAP table REBW_OCCUPNCY_21 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP REBW_OCCUPNCY_21 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 REBW_OCCUPNCY_21. 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 REBW_OCCUPNCY_21 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_REBW_OCCUPNCY_21 TYPE STANDARD TABLE OF REBW_OCCUPNCY_21,
      WA_REBW_OCCUPNCY_21 TYPE REBW_OCCUPNCY_21,
      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: <REBW_OCCUPNCY_21> TYPE REBW_OCCUPNCY_21.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_REBW_OCCUPNCY_21.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM REBW_OCCUPNCY_21
  INTO TABLE IT_REBW_OCCUPNCY_21.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REBW_OCCUPNCY_21
*  INTO TABLE @DATA(IT_REBW_OCCUPNCY_212).
*--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_REBW_OCCUPNCY_21 INDEX 1 INTO DATA(WA_REBW_OCCUPNCY_212).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_REBW_OCCUPNCY_21 ASSIGNING <REBW_OCCUPNCY_21>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REBW_OCCUPNCY_21>-BUKRS = 1.
<REBW_OCCUPNCY_21>-SWENR = 1.
<REBW_OCCUPNCY_21>-SMENR = 1.
<REBW_OCCUPNCY_21>-SGRNR = 1.
<REBW_OCCUPNCY_21>-SGENR = 1.

ENDLOOP.

LOOP AT IT_REBW_OCCUPNCY_21 INTO WA_REBW_OCCUPNCY_21.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REBW_OCCUPNCY_21-SMIVE, sy-vline,
  WA_REBW_OCCUPNCY_21-DMIBEG, sy-vline,
  WA_REBW_OCCUPNCY_21-DMIEND, sy-vline,
  WA_REBW_OCCUPNCY_21-DKUEZU, sy-vline,
  WA_REBW_OCCUPNCY_21-REOBJ, sy-vline,
  WA_REBW_OCCUPNCY_21-DATEFROM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REBW_OCCUPNCY_21 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_REBW_OCCUPNCY_21 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_REBW_OCCUPNCY_21 INTO WA_REBW_OCCUPNCY_21.


*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 SWENR, internal->external for field SWENR
CALL FUNCTION 'CONVERSION_EXIT_SWENR_OUTPUT'
  EXPORTING
    input =                      WA_REBW_OCCUPNCY_21-SWENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REBW_OCCUPNCY_21-SWENR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SMENR, internal->external for field SMENR
CALL FUNCTION 'CONVERSION_EXIT_SMENR_OUTPUT'
  EXPORTING
    input =                      WA_REBW_OCCUPNCY_21-SMENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REBW_OCCUPNCY_21-SMENR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SGRNR, internal->external for field SGRNR
CALL FUNCTION 'CONVERSION_EXIT_SGRNR_OUTPUT'
  EXPORTING
    input =                      WA_REBW_OCCUPNCY_21-SGRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REBW_OCCUPNCY_21-SGRNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SGENR, internal->external for field SGENR
CALL FUNCTION 'CONVERSION_EXIT_SGENR_OUTPUT'
  EXPORTING
    input =                      WA_REBW_OCCUPNCY_21-SGENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REBW_OCCUPNCY_21-SGENR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SMIVE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REBW_OCCUPNCY_21-SMIVE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REBW_OCCUPNCY_21-SMIVE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field DAY_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REBW_OCCUPNCY_21-DAY_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REBW_OCCUPNCY_21-DAY_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_REBW_OCCUPNCY_21_STR, 
BUKRS TYPE STRING,
SWENR TYPE STRING,
SMENR TYPE STRING,
SGRNR TYPE STRING,
SGENR TYPE STRING,
SMIVE TYPE STRING,
DMIBEG TYPE STRING,
DMIEND TYPE STRING,
DKUEZU TYPE STRING,
REOBJ TYPE STRING,
DATEFROM TYPE STRING,
DATETO TYPE STRING,
SNUNR TYPE STRING,
STAT TYPE STRING,
ATAGEOCC TYPE STRING,
DAY_UNIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REBW_OCCUPNCY_21_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_REBW_OCCUPNCY_21_STR-BUKRS sy-vline 
WA_REBW_OCCUPNCY_21_STR-SWENR sy-vline 
WA_REBW_OCCUPNCY_21_STR-SMENR sy-vline 
WA_REBW_OCCUPNCY_21_STR-SGRNR sy-vline 
WA_REBW_OCCUPNCY_21_STR-SGENR sy-vline 
WA_REBW_OCCUPNCY_21_STR-SMIVE sy-vline 
WA_REBW_OCCUPNCY_21_STR-DMIBEG sy-vline 
WA_REBW_OCCUPNCY_21_STR-DMIEND sy-vline 
WA_REBW_OCCUPNCY_21_STR-DKUEZU sy-vline 
WA_REBW_OCCUPNCY_21_STR-REOBJ sy-vline 
WA_REBW_OCCUPNCY_21_STR-DATEFROM sy-vline 
WA_REBW_OCCUPNCY_21_STR-DATETO sy-vline 
WA_REBW_OCCUPNCY_21_STR-SNUNR sy-vline 
WA_REBW_OCCUPNCY_21_STR-STAT sy-vline 
WA_REBW_OCCUPNCY_21_STR-ATAGEOCC sy-vline 
WA_REBW_OCCUPNCY_21_STR-DAY_UNIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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