ABAP Select data from SAP table RJH0301 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RJH0301 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 RJH0301. 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 RJH0301 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_RJH0301 TYPE STANDARD TABLE OF RJH0301,
      WA_RJH0301 TYPE RJH0301,
      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: <RJH0301> TYPE RJH0301.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RJH0301.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RJH0301
  INTO TABLE IT_RJH0301.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RJH0301
*  INTO TABLE @DATA(IT_RJH03012).
*--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_RJH0301 INDEX 1 INTO DATA(WA_RJH03012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RJH0301 ASSIGNING <RJH0301>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RJH0301>-BELEINH = 1.
<RJH0301>-ERSCHDAT = 1.
<RJH0301>-BEARB = 1.
<RJH0301>-XMARK = 1.
<RJH0301>-STUFE = 1.

ENDLOOP.

LOOP AT IT_RJH0301 INTO WA_RJH0301.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RJH0301-DISP_STUFE, sy-vline,
  WA_RJH0301-WTR_AUFLOE, sy-vline,
  WA_RJH0301-CAPACITY, sy-vline,
  WA_RJH0301-PLATZ_FREI, sy-vline,
  WA_RJH0301-PLATZ_RESV, sy-vline,
  WA_RJH0301-PLATZ_BELE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RJH0301 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_RJH0301 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_RJH0301 INTO WA_RJH0301.


*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 BELEINH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RJH0301-BELEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJH0301-BELEINH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNITTEILBL
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RJH0301-UNITTEILBL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJH0301-UNITTEILBL.
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_RJH0301_STR, 
BELEINH TYPE STRING,
ERSCHDAT TYPE STRING,
BEARB TYPE STRING,
XMARK TYPE STRING,
STUFE TYPE STRING,
DISP_STUFE TYPE STRING,
WTR_AUFLOE TYPE STRING,
CAPACITY TYPE STRING,
PLATZ_FREI TYPE STRING,
PLATZ_RESV TYPE STRING,
PLATZ_BELE TYPE STRING,
TEILBELEG TYPE STRING,
TEIL_RESV TYPE STRING,
TEIL_UNPLZ TYPE STRING,
TRES_UNPLZ TYPE STRING,
UNITTEILBL TYPE STRING,
POTENTIAL TYPE STRING,
DSPMG_BE TYPE STRING,
DSPMG_TB TYPE STRING,
DSPMG_RE TYPE STRING,
DSPMG_TR TYPE STRING,
XMINCPCITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RJH0301_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_RJH0301_STR-BELEINH sy-vline 
WA_RJH0301_STR-ERSCHDAT sy-vline 
WA_RJH0301_STR-BEARB sy-vline 
WA_RJH0301_STR-XMARK sy-vline 
WA_RJH0301_STR-STUFE sy-vline 
WA_RJH0301_STR-DISP_STUFE sy-vline 
WA_RJH0301_STR-WTR_AUFLOE sy-vline 
WA_RJH0301_STR-CAPACITY sy-vline 
WA_RJH0301_STR-PLATZ_FREI sy-vline 
WA_RJH0301_STR-PLATZ_RESV sy-vline 
WA_RJH0301_STR-PLATZ_BELE sy-vline 
WA_RJH0301_STR-TEILBELEG sy-vline 
WA_RJH0301_STR-TEIL_RESV sy-vline 
WA_RJH0301_STR-TEIL_UNPLZ sy-vline 
WA_RJH0301_STR-TRES_UNPLZ sy-vline 
WA_RJH0301_STR-UNITTEILBL sy-vline 
WA_RJH0301_STR-POTENTIAL sy-vline 
WA_RJH0301_STR-DSPMG_BE sy-vline 
WA_RJH0301_STR-DSPMG_TB sy-vline 
WA_RJH0301_STR-DSPMG_RE sy-vline 
WA_RJH0301_STR-DSPMG_TR sy-vline 
WA_RJH0301_STR-XMINCPCITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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