ABAP Select data from SAP table /SAPMP/RCPARAMETERS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SAPMP/RCPARAMETERS 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 /SAPMP/RCPARAMETERS. 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 /SAPMP/RCPARAMETERS 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_/SAPMP/RCPARAMETERS TYPE STANDARD TABLE OF /SAPMP/RCPARAMETERS,
      WA_/SAPMP/RCPARAMETERS TYPE /SAPMP/RCPARAMETERS,
      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: </SAPMP/RCPARAMETERS> TYPE /SAPMP/RCPARAMETERS.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SAPMP/RCPARAMETERS
  INTO TABLE IT_/SAPMP/RCPARAMETERS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPMP/RCPARAMETERS
*  INTO TABLE @DATA(IT_/SAPMP/RCPARAMETERS2).
*--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_/SAPMP/RCPARAMETERS INDEX 1 INTO DATA(WA_/SAPMP/RCPARAMETERS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SAPMP/RCPARAMETERS ASSIGNING </SAPMP/RCPARAMETERS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPMP/RCPARAMETERS>-SILNG = 1.
</SAPMP/RCPARAMETERS>-RETYP = 1.
</SAPMP/RCPARAMETERS>-MAODM = 1.
</SAPMP/RCPARAMETERS>-PLTOA = 1.
</SAPMP/RCPARAMETERS>-PLTOP = 1.

ENDLOOP.

LOOP AT IT_/SAPMP/RCPARAMETERS INTO WA_/SAPMP/RCPARAMETERS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPMP/RCPARAMETERS-MAXLG, sy-vline,
  WA_/SAPMP/RCPARAMETERS-LCCRE, sy-vline,
  WA_/SAPMP/RCPARAMETERS-NETWE, sy-vline,
  WA_/SAPMP/RCPARAMETERS-CABWE, sy-vline,
  WA_/SAPMP/RCPARAMETERS-CABDM, sy-vline,
  WA_/SAPMP/RCPARAMETERS-ALCDP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPMP/RCPARAMETERS 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_/SAPMP/RCPARAMETERS 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_/SAPMP/RCPARAMETERS INTO WA_/SAPMP/RCPARAMETERS.


*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 MATN1, internal->external for field RETYP
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/SAPMP/RCPARAMETERS-RETYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPMP/RCPARAMETERS-RETYP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field LCCRE
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/SAPMP/RCPARAMETERS-LCCRE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPMP/RCPARAMETERS-LCCRE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SAPMP/RCPARAMETERS-UNIT1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPMP/RCPARAMETERS-UNIT1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT2
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SAPMP/RCPARAMETERS-UNIT2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPMP/RCPARAMETERS-UNIT2.
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_/SAPMP/RCPARAMETERS_STR, 
SILNG TYPE STRING,
RETYP TYPE STRING,
MAODM TYPE STRING,
PLTOA TYPE STRING,
PLTOP TYPE STRING,
MAXLG TYPE STRING,
LCCRE TYPE STRING,
NETWE TYPE STRING,
CABWE TYPE STRING,
CABDM TYPE STRING,
ALCDP TYPE STRING,
BENFA TYPE STRING,
MINCD TYPE STRING,
MNVEL TYPE STRING,
MINCL TYPE STRING,
REODM TYPE STRING,
RECDM TYPE STRING,
REINW TYPE STRING,
REWEI TYPE STRING,
RELCP TYPE STRING,
RERFH TYPE STRING,
RERFT TYPE STRING,
INDRF TYPE STRING,
QUAN1 TYPE STRING,
QUAN2 TYPE STRING,
UNIT1 TYPE STRING,
UNIT2 TYPE STRING,
RCODE TYPE STRING,
TABIX TYPE STRING,
RSCAT TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPMP/RCPARAMETERS_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_/SAPMP/RCPARAMETERS_STR-SILNG sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-RETYP sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-MAODM sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-PLTOA sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-PLTOP sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-MAXLG sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-LCCRE sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-NETWE sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-CABWE sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-CABDM sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-ALCDP sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-BENFA sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-MINCD sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-MNVEL sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-MINCL sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-REODM sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-RECDM sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-REINW sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-REWEI sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-RELCP sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-RERFH sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-RERFT sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-INDRF sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-QUAN1 sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-QUAN2 sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-UNIT1 sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-UNIT2 sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-RCODE sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-TABIX sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-RSCAT sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-MSGV1 sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-MSGV2 sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-MSGV3 sy-vline 
WA_/SAPMP/RCPARAMETERS_STR-MSGV4 sy-vline      INTO ld_text SEPARATED BY SPACE.

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