ABAP Select data from SAP table PRMCUSTRULPARAM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PRMCUSTRULPARAM
*  INTO TABLE @DATA(IT_PRMCUSTRULPARAM2).
*--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_PRMCUSTRULPARAM INDEX 1 INTO DATA(WA_PRMCUSTRULPARAM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PRMCUSTRULPARAM>-CONTEXTTYPE = 1.
<PRMCUSTRULPARAM>-CONTEXTID = 1.
<PRMCUSTRULPARAM>-AGENTRULEID = 1.
<PRMCUSTRULPARAM>-PARAMETERNAME = 1.
<PRMCUSTRULPARAM>-AGENTRULEPARAMETERTEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PRMCUSTRULPARAM-DATASOURCEMAPPING, sy-vline,
  WA_PRMCUSTRULPARAM-CONSTANTTYPE, sy-vline,
  WA_PRMCUSTRULPARAM-CONSTANTSTRINGVALUE, sy-vline,
  WA_PRMCUSTRULPARAM-SUPPLIEDBYCALLER, sy-vline,
  WA_PRMCUSTRULPARAM-VALUEHELPCDSVIEWNAME, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_PRMCUSTRULPARAM 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_PRMCUSTRULPARAM 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_PRMCUSTRULPARAM INTO WA_PRMCUSTRULPARAM.


*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_PRMCUSTRULPARAM_STR, 
CONTEXTTYPE TYPE STRING,
CONTEXTID TYPE STRING,
AGENTRULEID TYPE STRING,
PARAMETERNAME TYPE STRING,
AGENTRULEPARAMETERTEXT TYPE STRING,
DATASOURCEMAPPING TYPE STRING,
CONSTANTTYPE TYPE STRING,
CONSTANTSTRINGVALUE TYPE STRING,
SUPPLIEDBYCALLER TYPE STRING,
VALUEHELPCDSVIEWNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PRMCUSTRULPARAM_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_PRMCUSTRULPARAM_STR-CONTEXTTYPE sy-vline 
WA_PRMCUSTRULPARAM_STR-CONTEXTID sy-vline 
WA_PRMCUSTRULPARAM_STR-AGENTRULEID sy-vline 
WA_PRMCUSTRULPARAM_STR-PARAMETERNAME sy-vline 
WA_PRMCUSTRULPARAM_STR-AGENTRULEPARAMETERTEXT sy-vline 
WA_PRMCUSTRULPARAM_STR-DATASOURCEMAPPING sy-vline 
WA_PRMCUSTRULPARAM_STR-CONSTANTTYPE sy-vline 
WA_PRMCUSTRULPARAM_STR-CONSTANTSTRINGVALUE sy-vline 
WA_PRMCUSTRULPARAM_STR-SUPPLIEDBYCALLER sy-vline 
WA_PRMCUSTRULPARAM_STR-VALUEHELPCDSVIEWNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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