ABAP Select data from SAP table RKB1X into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RKB1X 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 RKB1X. 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 RKB1X 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_RKB1X TYPE STANDARD TABLE OF RKB1X,
      WA_RKB1X TYPE RKB1X,
      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: <RKB1X> TYPE RKB1X.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKB1X.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKB1X
  INTO TABLE IT_RKB1X.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKB1X
*  INTO TABLE @DATA(IT_RKB1X2).
*--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_RKB1X INDEX 1 INTO DATA(WA_RKB1X2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKB1X ASSIGNING <RKB1X>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKB1X>-TABNAME = 1.
<RKB1X>-ASPET = 1.
<RKB1X>-VERSO = 1.
<RKB1X>-ERKRS = 1.
<RKB1X>-PA_MCURR = 1.

ENDLOOP.

LOOP AT IT_RKB1X INTO WA_RKB1X.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKB1X-PA_TYPE, sy-vline,
  WA_RKB1X-BERVA, sy-vline,
  WA_RKB1X-PERFLAG, sy-vline,
  WA_RKB1X-PERFLAG2, sy-vline,
  WA_RKB1X-PERIV2, sy-vline,
  WA_RKB1X-LIBRARY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKB1X 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_RKB1X 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_RKB1X INTO WA_RKB1X.


*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_RKB1X_STR, 
TABNAME TYPE STRING,
ASPET TYPE STRING,
VERSO TYPE STRING,
ERKRS TYPE STRING,
PA_MCURR TYPE STRING,
PA_TYPE TYPE STRING,
BERVA TYPE STRING,
PERFLAG TYPE STRING,
PERFLAG2 TYPE STRING,
PERIV2 TYPE STRING,
LIBRARY TYPE STRING,
KOKRS TYPE STRING,
KTOPL TYPE STRING,
FIKRS TYPE STRING,
BUKRS TYPE STRING,
WAERSG TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
PLVAR TYPE STRING,
PERIV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKB1X_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_RKB1X_STR-TABNAME sy-vline 
WA_RKB1X_STR-ASPET sy-vline 
WA_RKB1X_STR-VERSO sy-vline 
WA_RKB1X_STR-ERKRS sy-vline 
WA_RKB1X_STR-PA_MCURR sy-vline 
WA_RKB1X_STR-PA_TYPE sy-vline 
WA_RKB1X_STR-BERVA sy-vline 
WA_RKB1X_STR-PERFLAG sy-vline 
WA_RKB1X_STR-PERFLAG2 sy-vline 
WA_RKB1X_STR-PERIV2 sy-vline 
WA_RKB1X_STR-LIBRARY sy-vline 
WA_RKB1X_STR-KOKRS sy-vline 
WA_RKB1X_STR-KTOPL sy-vline 
WA_RKB1X_STR-FIKRS sy-vline 
WA_RKB1X_STR-BUKRS sy-vline 
WA_RKB1X_STR-WAERSG sy-vline 
WA_RKB1X_STR-VKORG sy-vline 
WA_RKB1X_STR-VTWEG sy-vline 
WA_RKB1X_STR-SPART sy-vline 
WA_RKB1X_STR-PLVAR sy-vline 
WA_RKB1X_STR-PERIV sy-vline      INTO ld_text SEPARATED BY SPACE.

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