ABAP Select data from SAP table IRERNWLRULMERG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IRERNWLRULMERG
*  INTO TABLE @DATA(IT_IRERNWLRULMERG2).
*--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_IRERNWLRULMERG INDEX 1 INTO DATA(WA_IRERNWLRULMERG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IRERNWLRULMERG>-MANDT = 1.
<IRERNWLRULMERG>-INTERNALREALESTATENUMBER = 1.
<IRERNWLRULMERG>-RETERMTYPE = 1.
<IRERNWLRULMERG>-RETERMNUMBER = 1.
<IRERNWLRULMERG>-RERENEWALTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IRERNWLRULMERG-RERENEWALSEQUENCENUMBER, sy-vline,
  WA_IRERNWLRULMERG-RERENEWALRULETYPE, sy-vline,
  WA_IRERNWLRULMERG-RERENEWALRULE, sy-vline,
  WA_IRERNWLRULMERG-REAUTOMATICRENEWALTYPE, sy-vline,
  WA_IRERNWLRULMERG-RENUMBEROFRENEWALS, sy-vline,
  WA_IRERNWLRULMERG-RERENEWALPERIODINYEARS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IRERNWLRULMERG 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_IRERNWLRULMERG 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_IRERNWLRULMERG INTO WA_IRERNWLRULMERG.


*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 RETERMNUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IRERNWLRULMERG-RETERMNUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IRERNWLRULMERG-RETERMNUMBER.
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_IRERNWLRULMERG_STR, 
MANDT TYPE STRING,
INTERNALREALESTATENUMBER TYPE STRING,
RETERMTYPE TYPE STRING,
RETERMNUMBER TYPE STRING,
RERENEWALTYPE TYPE STRING,
RERENEWALSEQUENCENUMBER TYPE STRING,
RERENEWALRULETYPE TYPE STRING,
RERENEWALRULE TYPE STRING,
REAUTOMATICRENEWALTYPE TYPE STRING,
RENUMBEROFRENEWALS TYPE STRING,
RERENEWALPERIODINYEARS TYPE STRING,
RERENEWALPERIODINMONTHS TYPE STRING,
RERENEWALPERIODINDAYS TYPE STRING,
RERENEWALROUNDINGDATERULE TYPE STRING,
RENOTIFICATIONPERIODINYEARS TYPE STRING,
RENOTIFICATIONPERIODINMONTHS TYPE STRING,
RENOTIFICATIONPERIODINWEEKS TYPE STRING,
RENOTIFICATIONPERIODINDAYS TYPE STRING,
RENOTIFICATIONROUNDINGDATERULE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IRERNWLRULMERG_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_IRERNWLRULMERG_STR-MANDT sy-vline 
WA_IRERNWLRULMERG_STR-INTERNALREALESTATENUMBER sy-vline 
WA_IRERNWLRULMERG_STR-RETERMTYPE sy-vline 
WA_IRERNWLRULMERG_STR-RETERMNUMBER sy-vline 
WA_IRERNWLRULMERG_STR-RERENEWALTYPE sy-vline 
WA_IRERNWLRULMERG_STR-RERENEWALSEQUENCENUMBER sy-vline 
WA_IRERNWLRULMERG_STR-RERENEWALRULETYPE sy-vline 
WA_IRERNWLRULMERG_STR-RERENEWALRULE sy-vline 
WA_IRERNWLRULMERG_STR-REAUTOMATICRENEWALTYPE sy-vline 
WA_IRERNWLRULMERG_STR-RENUMBEROFRENEWALS sy-vline 
WA_IRERNWLRULMERG_STR-RERENEWALPERIODINYEARS sy-vline 
WA_IRERNWLRULMERG_STR-RERENEWALPERIODINMONTHS sy-vline 
WA_IRERNWLRULMERG_STR-RERENEWALPERIODINDAYS sy-vline 
WA_IRERNWLRULMERG_STR-RERENEWALROUNDINGDATERULE sy-vline 
WA_IRERNWLRULMERG_STR-RENOTIFICATIONPERIODINYEARS sy-vline 
WA_IRERNWLRULMERG_STR-RENOTIFICATIONPERIODINMONTHS sy-vline 
WA_IRERNWLRULMERG_STR-RENOTIFICATIONPERIODINWEEKS sy-vline 
WA_IRERNWLRULMERG_STR-RENOTIFICATIONPERIODINDAYS sy-vline 
WA_IRERNWLRULMERG_STR-RENOTIFICATIONROUNDINGDATERULE sy-vline      INTO ld_text SEPARATED BY SPACE.

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