ABAP Select data from SAP table RJKPERIOD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RJKPERIOD
*  INTO TABLE @DATA(IT_RJKPERIOD2).
*--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_RJKPERIOD INDEX 1 INTO DATA(WA_RJKPERIOD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RJKPERIOD>-TERMINTYP = 1.
<RJKPERIOD>-LAENGE_PER = 1.
<RJKPERIOD>-TERMVON = 1.
<RJKPERIOD>-TERMBIS = 1.
<RJKPERIOD>-TERMVONC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RJKPERIOD-TERMBISC, sy-vline,
  WA_RJKPERIOD-EXPIRATION, sy-vline,
  WA_RJKPERIOD-RECHVON, sy-vline,
  WA_RJKPERIOD-RECHVONC, sy-vline,
  WA_RJKPERIOD-RECHBIS, sy-vline,
  WA_RJKPERIOD-RECHBISC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RJKPERIOD 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_RJKPERIOD 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_RJKPERIOD INTO WA_RJKPERIOD.


*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_RJKPERIOD_STR, 
TERMINTYP TYPE STRING,
LAENGE_PER TYPE STRING,
TERMVON TYPE STRING,
TERMBIS TYPE STRING,
TERMVONC TYPE STRING,
TERMBISC TYPE STRING,
EXPIRATION TYPE STRING,
RECHVON TYPE STRING,
RECHVONC TYPE STRING,
RECHBIS TYPE STRING,
RECHBISC TYPE STRING,
NEXTFAKT TYPE STRING,
NEXTFAKTC TYPE STRING,
FAKTTO TYPE STRING,
FAKTTOC TYPE STRING,
FAKTMODFROM TYPE STRING,
SPLITTFROM TYPE STRING,
DELIVEND_ACT TYPE STRING,
DELIVEND_ACTC TYPE STRING,
DELIVEND_REQ TYPE STRING,
DELIVEND_POS TYPE STRING,
DELIVEND_POSC TYPE STRING,
ETERMVON TYPE STRING,
ETERMVONC TYPE STRING,
ETERMBIS TYPE STRING,
ETERMBISC TYPE STRING,
MISSINGFROM TYPE STRING,
MISSINGTO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RJKPERIOD_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_RJKPERIOD_STR-TERMINTYP sy-vline 
WA_RJKPERIOD_STR-LAENGE_PER sy-vline 
WA_RJKPERIOD_STR-TERMVON sy-vline 
WA_RJKPERIOD_STR-TERMBIS sy-vline 
WA_RJKPERIOD_STR-TERMVONC sy-vline 
WA_RJKPERIOD_STR-TERMBISC sy-vline 
WA_RJKPERIOD_STR-EXPIRATION sy-vline 
WA_RJKPERIOD_STR-RECHVON sy-vline 
WA_RJKPERIOD_STR-RECHVONC sy-vline 
WA_RJKPERIOD_STR-RECHBIS sy-vline 
WA_RJKPERIOD_STR-RECHBISC sy-vline 
WA_RJKPERIOD_STR-NEXTFAKT sy-vline 
WA_RJKPERIOD_STR-NEXTFAKTC sy-vline 
WA_RJKPERIOD_STR-FAKTTO sy-vline 
WA_RJKPERIOD_STR-FAKTTOC sy-vline 
WA_RJKPERIOD_STR-FAKTMODFROM sy-vline 
WA_RJKPERIOD_STR-SPLITTFROM sy-vline 
WA_RJKPERIOD_STR-DELIVEND_ACT sy-vline 
WA_RJKPERIOD_STR-DELIVEND_ACTC sy-vline 
WA_RJKPERIOD_STR-DELIVEND_REQ sy-vline 
WA_RJKPERIOD_STR-DELIVEND_POS sy-vline 
WA_RJKPERIOD_STR-DELIVEND_POSC sy-vline 
WA_RJKPERIOD_STR-ETERMVON sy-vline 
WA_RJKPERIOD_STR-ETERMVONC sy-vline 
WA_RJKPERIOD_STR-ETERMBIS sy-vline 
WA_RJKPERIOD_STR-ETERMBISC sy-vline 
WA_RJKPERIOD_STR-MISSINGFROM sy-vline 
WA_RJKPERIOD_STR-MISSINGTO sy-vline      INTO ld_text SEPARATED BY SPACE.

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