ABAP Select data from SAP table RKCTMH1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RKCTMH1 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 RKCTMH1. 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 RKCTMH1 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_RKCTMH1 TYPE STANDARD TABLE OF RKCTMH1,
      WA_RKCTMH1 TYPE RKCTMH1,
      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: <RKCTMH1> TYPE RKCTMH1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKCTMH1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKCTMH1
  INTO TABLE IT_RKCTMH1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKCTMH1
*  INTO TABLE @DATA(IT_RKCTMH12).
*--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_RKCTMH1 INDEX 1 INTO DATA(WA_RKCTMH12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKCTMH1 ASSIGNING <RKCTMH1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKCTMH1>-RLDNR = 1.
<RKCTMH1>-KOKRS = 1.
<RKCTMH1>-RPRCTR = 1.
<RKCTMH1>-RYEAR = 1.
<RKCTMH1>-RPMAX = 1.

ENDLOOP.

LOOP AT IT_RKCTMH1 INTO WA_RKCTMH1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKCTMH1-RVERS, sy-vline,
  WA_RKCTMH1-RRCTY, sy-vline,
  WA_RKCTMH1-RBUKRS, sy-vline,
  WA_RKCTMH1-RACCT, sy-vline,
  WA_RKCTMH1-SPRCTR, sy-vline,
  WA_RKCTMH1-KSL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKCTMH1 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_RKCTMH1 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_RKCTMH1 INTO WA_RKCTMH1.


*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_RKCTMH1_STR, 
RLDNR TYPE STRING,
KOKRS TYPE STRING,
RPRCTR TYPE STRING,
RYEAR TYPE STRING,
RPMAX TYPE STRING,
RVERS TYPE STRING,
RRCTY TYPE STRING,
RBUKRS TYPE STRING,
RACCT TYPE STRING,
SPRCTR TYPE STRING,
KSL TYPE STRING,
UKSL TYPE STRING,
MSL TYPE STRING,
UMSL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKCTMH1_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_RKCTMH1_STR-RLDNR sy-vline 
WA_RKCTMH1_STR-KOKRS sy-vline 
WA_RKCTMH1_STR-RPRCTR sy-vline 
WA_RKCTMH1_STR-RYEAR sy-vline 
WA_RKCTMH1_STR-RPMAX sy-vline 
WA_RKCTMH1_STR-RVERS sy-vline 
WA_RKCTMH1_STR-RRCTY sy-vline 
WA_RKCTMH1_STR-RBUKRS sy-vline 
WA_RKCTMH1_STR-RACCT sy-vline 
WA_RKCTMH1_STR-SPRCTR sy-vline 
WA_RKCTMH1_STR-KSL sy-vline 
WA_RKCTMH1_STR-UKSL sy-vline 
WA_RKCTMH1_STR-MSL sy-vline 
WA_RKCTMH1_STR-UMSL sy-vline      INTO ld_text SEPARATED BY SPACE.

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