ABAP Select data from SAP table RFC_METADATA_PARAMS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFC_METADATA_PARAMS
*  INTO TABLE @DATA(IT_RFC_METADATA_PARAMS2).
*--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_RFC_METADATA_PARAMS INDEX 1 INTO DATA(WA_RFC_METADATA_PARAMS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFC_METADATA_PARAMS>-FUNCNAME = 1.
<RFC_METADATA_PARAMS>-PARAMCLASS = 1.
<RFC_METADATA_PARAMS>-PARAMETER = 1.
<RFC_METADATA_PARAMS>-TABNAME = 1.
<RFC_METADATA_PARAMS>-FIELDNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFC_METADATA_PARAMS-EXID, sy-vline,
  WA_RFC_METADATA_PARAMS-POSITION, sy-vline,
  WA_RFC_METADATA_PARAMS-OFFSET, sy-vline,
  WA_RFC_METADATA_PARAMS-INTLENGTH, sy-vline,
  WA_RFC_METADATA_PARAMS-DECIMALS, sy-vline,
  WA_RFC_METADATA_PARAMS-DEFAULT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFC_METADATA_PARAMS 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_RFC_METADATA_PARAMS 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_RFC_METADATA_PARAMS INTO WA_RFC_METADATA_PARAMS.


*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_RFC_METADATA_PARAMS_STR, 
FUNCNAME TYPE STRING,
PARAMCLASS TYPE STRING,
PARAMETER TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
EXID TYPE STRING,
POSITION TYPE STRING,
OFFSET TYPE STRING,
INTLENGTH TYPE STRING,
DECIMALS TYPE STRING,
DEFAULT TYPE STRING,
PARAMTEXT TYPE STRING,
OPTIONAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFC_METADATA_PARAMS_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_RFC_METADATA_PARAMS_STR-FUNCNAME sy-vline 
WA_RFC_METADATA_PARAMS_STR-PARAMCLASS sy-vline 
WA_RFC_METADATA_PARAMS_STR-PARAMETER sy-vline 
WA_RFC_METADATA_PARAMS_STR-TABNAME sy-vline 
WA_RFC_METADATA_PARAMS_STR-FIELDNAME sy-vline 
WA_RFC_METADATA_PARAMS_STR-EXID sy-vline 
WA_RFC_METADATA_PARAMS_STR-POSITION sy-vline 
WA_RFC_METADATA_PARAMS_STR-OFFSET sy-vline 
WA_RFC_METADATA_PARAMS_STR-INTLENGTH sy-vline 
WA_RFC_METADATA_PARAMS_STR-DECIMALS sy-vline 
WA_RFC_METADATA_PARAMS_STR-DEFAULT sy-vline 
WA_RFC_METADATA_PARAMS_STR-PARAMTEXT sy-vline 
WA_RFC_METADATA_PARAMS_STR-OPTIONAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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