ABAP Select data from SAP table RN1FOTHCLA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN1FOTHCLA 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 RN1FOTHCLA. 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 RN1FOTHCLA 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_RN1FOTHCLA TYPE STANDARD TABLE OF RN1FOTHCLA,
      WA_RN1FOTHCLA TYPE RN1FOTHCLA,
      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: <RN1FOTHCLA> TYPE RN1FOTHCLA.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN1FOTHCLA.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN1FOTHCLA
  INTO TABLE IT_RN1FOTHCLA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN1FOTHCLA
*  INTO TABLE @DATA(IT_RN1FOTHCLA2).
*--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_RN1FOTHCLA INDEX 1 INTO DATA(WA_RN1FOTHCLA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN1FOTHCLA ASSIGNING <RN1FOTHCLA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN1FOTHCLA>-MANDT = 1.
<RN1FOTHCLA>-CLASSSYS = 1.
<RN1FOTHCLA>-THCLASSID = 1.
<RN1FOTHCLA>-DRUGID = 1.
<RN1FOTHCLA>-SEQNO = 1.

ENDLOOP.

LOOP AT IT_RN1FOTHCLA INTO WA_RN1FOTHCLA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN1FOTHCLA-ERDAT, sy-vline,
  WA_RN1FOTHCLA-ERTIM, sy-vline,
  WA_RN1FOTHCLA-ERUSR, sy-vline,
  WA_RN1FOTHCLA-UPDAT, sy-vline,
  WA_RN1FOTHCLA-UPTIM, sy-vline,
  WA_RN1FOTHCLA-UPUSR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN1FOTHCLA 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_RN1FOTHCLA 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_RN1FOTHCLA INTO WA_RN1FOTHCLA.


*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_RN1FOTHCLA_STR, 
MANDT TYPE STRING,
CLASSSYS TYPE STRING,
THCLASSID TYPE STRING,
DRUGID TYPE STRING,
SEQNO TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
UPUSR TYPE STRING,
UPDKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN1FOTHCLA_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_RN1FOTHCLA_STR-MANDT sy-vline 
WA_RN1FOTHCLA_STR-CLASSSYS sy-vline 
WA_RN1FOTHCLA_STR-THCLASSID sy-vline 
WA_RN1FOTHCLA_STR-DRUGID sy-vline 
WA_RN1FOTHCLA_STR-SEQNO sy-vline 
WA_RN1FOTHCLA_STR-ERDAT sy-vline 
WA_RN1FOTHCLA_STR-ERTIM sy-vline 
WA_RN1FOTHCLA_STR-ERUSR sy-vline 
WA_RN1FOTHCLA_STR-UPDAT sy-vline 
WA_RN1FOTHCLA_STR-UPTIM sy-vline 
WA_RN1FOTHCLA_STR-UPUSR sy-vline 
WA_RN1FOTHCLA_STR-UPDKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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