ABAP Select data from SAP table RJHAPPVB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RJHAPPVB
*  INTO TABLE @DATA(IT_RJHAPPVB2).
*--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_RJHAPPVB INDEX 1 INTO DATA(WA_RJHAPPVB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RJHAPPVB>-MANDT = 1.
<RJHAPPVB>-AVM_NR = 1.
<RJHAPPVB>-POS_NR = 1.
<RJHAPPVB>-PK_SERVICE_DATE = 1.
<RJHAPPVB>-START_DATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RJHAPPVB-PRODH, sy-vline,
  WA_RJHAPPVB-STICHW, sy-vline,
  WA_RJHAPPVB-XUVPKEL_PREIS, sy-vline,
  WA_RJHAPPVB-MERKMAL0, sy-vline,
  WA_RJHAPPVB-MERKMAL1, sy-vline,
  WA_RJHAPPVB-MERKMAL2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RJHAPPVB 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_RJHAPPVB 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_RJHAPPVB INTO WA_RJHAPPVB.


*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 AVM_NR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RJHAPPVB-AVM_NR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJHAPPVB-AVM_NR.
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_RJHAPPVB_STR, 
MANDT TYPE STRING,
AVM_NR TYPE STRING,
POS_NR TYPE STRING,
PK_SERVICE_DATE TYPE STRING,
START_DATE TYPE STRING,
PRODH TYPE STRING,
STICHW TYPE STRING,
XUVPKEL_PREIS TYPE STRING,
MERKMAL0 TYPE STRING,
MERKMAL1 TYPE STRING,
MERKMAL2 TYPE STRING,
MERKMAL3 TYPE STRING,
MERKMAL4 TYPE STRING,
MERKMAL5 TYPE STRING,
MERKMAL6 TYPE STRING,
MERKMAL7 TYPE STRING,
MERKMAL8 TYPE STRING,
MERKMAL9 TYPE STRING,
DBCODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RJHAPPVB_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_RJHAPPVB_STR-MANDT sy-vline 
WA_RJHAPPVB_STR-AVM_NR sy-vline 
WA_RJHAPPVB_STR-POS_NR sy-vline 
WA_RJHAPPVB_STR-PK_SERVICE_DATE sy-vline 
WA_RJHAPPVB_STR-START_DATE sy-vline 
WA_RJHAPPVB_STR-PRODH sy-vline 
WA_RJHAPPVB_STR-STICHW sy-vline 
WA_RJHAPPVB_STR-XUVPKEL_PREIS sy-vline 
WA_RJHAPPVB_STR-MERKMAL0 sy-vline 
WA_RJHAPPVB_STR-MERKMAL1 sy-vline 
WA_RJHAPPVB_STR-MERKMAL2 sy-vline 
WA_RJHAPPVB_STR-MERKMAL3 sy-vline 
WA_RJHAPPVB_STR-MERKMAL4 sy-vline 
WA_RJHAPPVB_STR-MERKMAL5 sy-vline 
WA_RJHAPPVB_STR-MERKMAL6 sy-vline 
WA_RJHAPPVB_STR-MERKMAL7 sy-vline 
WA_RJHAPPVB_STR-MERKMAL8 sy-vline 
WA_RJHAPPVB_STR-MERKMAL9 sy-vline 
WA_RJHAPPVB_STR-DBCODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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