ABAP Select data from SAP table ARC_PARAMS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ARC_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 ARC_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 ARC_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_ARC_PARAMS TYPE STANDARD TABLE OF ARC_PARAMS,
      WA_ARC_PARAMS TYPE ARC_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: <ARC_PARAMS> TYPE ARC_PARAMS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ARC_PARAMS
*  INTO TABLE @DATA(IT_ARC_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_ARC_PARAMS INDEX 1 INTO DATA(WA_ARC_PARAMS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ARC_PARAMS>-SAP_OBJECT = 1.
<ARC_PARAMS>-AR_OBJECT = 1.
<ARC_PARAMS>-ARCHIV_ID = 1.
<ARC_PARAMS>-DOC_TYPE = 1.
<ARC_PARAMS>-RPC_HOST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ARC_PARAMS-RPC_SERVIC, sy-vline,
  WA_ARC_PARAMS-INTERFACE, sy-vline,
  WA_ARC_PARAMS-MANDANT, sy-vline,
  WA_ARC_PARAMS-REPORT, sy-vline,
  WA_ARC_PARAMS-INFO, sy-vline,
  WA_ARC_PARAMS-ARCTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ARC_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_ARC_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_ARC_PARAMS INTO WA_ARC_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.

*Conversion exit SPDEV, internal->external for field PRINTER
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_ARC_PARAMS-PRINTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ARC_PARAMS-PRINTER.
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_ARC_PARAMS_STR, 
SAP_OBJECT TYPE STRING,
AR_OBJECT TYPE STRING,
ARCHIV_ID TYPE STRING,
DOC_TYPE TYPE STRING,
RPC_HOST TYPE STRING,
RPC_SERVIC TYPE STRING,
INTERFACE TYPE STRING,
MANDANT TYPE STRING,
REPORT TYPE STRING,
INFO TYPE STRING,
ARCTEXT TYPE STRING,
DATUM TYPE STRING,
ARCUSER TYPE STRING,
PRINTER TYPE STRING,
FORMULAR TYPE STRING,
ARCHIVPATH TYPE STRING,
PROTOKOLL TYPE STRING,
VERSION TYPE STRING,
ACHECK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ARC_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_ARC_PARAMS_STR-SAP_OBJECT sy-vline 
WA_ARC_PARAMS_STR-AR_OBJECT sy-vline 
WA_ARC_PARAMS_STR-ARCHIV_ID sy-vline 
WA_ARC_PARAMS_STR-DOC_TYPE sy-vline 
WA_ARC_PARAMS_STR-RPC_HOST sy-vline 
WA_ARC_PARAMS_STR-RPC_SERVIC sy-vline 
WA_ARC_PARAMS_STR-INTERFACE sy-vline 
WA_ARC_PARAMS_STR-MANDANT sy-vline 
WA_ARC_PARAMS_STR-REPORT sy-vline 
WA_ARC_PARAMS_STR-INFO sy-vline 
WA_ARC_PARAMS_STR-ARCTEXT sy-vline 
WA_ARC_PARAMS_STR-DATUM sy-vline 
WA_ARC_PARAMS_STR-ARCUSER sy-vline 
WA_ARC_PARAMS_STR-PRINTER sy-vline 
WA_ARC_PARAMS_STR-FORMULAR sy-vline 
WA_ARC_PARAMS_STR-ARCHIVPATH sy-vline 
WA_ARC_PARAMS_STR-PROTOKOLL sy-vline 
WA_ARC_PARAMS_STR-VERSION sy-vline 
WA_ARC_PARAMS_STR-ACHECK sy-vline      INTO ld_text SEPARATED BY SPACE.

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