ABAP Select data from SAP table PARAMS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PARAMS
*  INTO TABLE @DATA(IT_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_PARAMS INDEX 1 INTO DATA(WA_PARAMS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PARAMS>-MEINN = 1.
<PARAMS>-MSTUF = 1.
<PARAMS>-MERNN = 1.
<PARAMS>-REKUZ = 1.
<PARAMS>-PFLAG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PARAMS-TABLE_FEAT, sy-vline,
  WA_PARAMS-PAHSC, sy-vline,
  WA_PARAMS-PAHER, sy-vline,
  WA_PARAMS-ATBEZ, sy-vline,
  WA_PARAMS-ATFEL, sy-vline,
  WA_PARAMS-ATNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_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_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_PARAMS INTO WA_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 ATINN, internal->external for field MERNN
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_PARAMS-MERNN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PARAMS-MERNN.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ATINN, internal->external for field MERNO
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_PARAMS-MERNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PARAMS-MERNO.
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_PARAMS_STR, 
MEINN TYPE STRING,
MSTUF TYPE STRING,
MERNN TYPE STRING,
REKUZ TYPE STRING,
PFLAG TYPE STRING,
TABLE_FEAT TYPE STRING,
PAHSC TYPE STRING,
PAHER TYPE STRING,
ATBEZ TYPE STRING,
ATFEL TYPE STRING,
ATNAM TYPE STRING,
GROUPI_ID TYPE STRING,
PAHE2 TYPE STRING,
ATFOR TYPE STRING,
ANZST TYPE STRING,
ANZDZ TYPE STRING,
MSEHI TYPE STRING,
PAHNR TYPE STRING,
ORIGIN TYPE STRING,
STUMP TYPE STRING,
MERNO TYPE STRING,
PARZZ TYPE STRING,
VORKZ TYPE STRING,
FLG_SEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_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_PARAMS_STR-MEINN sy-vline 
WA_PARAMS_STR-MSTUF sy-vline 
WA_PARAMS_STR-MERNN sy-vline 
WA_PARAMS_STR-REKUZ sy-vline 
WA_PARAMS_STR-PFLAG sy-vline 
WA_PARAMS_STR-TABLE_FEAT sy-vline 
WA_PARAMS_STR-PAHSC sy-vline 
WA_PARAMS_STR-PAHER sy-vline 
WA_PARAMS_STR-ATBEZ sy-vline 
WA_PARAMS_STR-ATFEL sy-vline 
WA_PARAMS_STR-ATNAM sy-vline 
WA_PARAMS_STR-GROUPI_ID sy-vline 
WA_PARAMS_STR-PAHE2 sy-vline 
WA_PARAMS_STR-ATFOR sy-vline 
WA_PARAMS_STR-ANZST sy-vline 
WA_PARAMS_STR-ANZDZ sy-vline 
WA_PARAMS_STR-MSEHI sy-vline 
WA_PARAMS_STR-PAHNR sy-vline 
WA_PARAMS_STR-ORIGIN sy-vline 
WA_PARAMS_STR-STUMP sy-vline 
WA_PARAMS_STR-MERNO sy-vline 
WA_PARAMS_STR-PARZZ sy-vline 
WA_PARAMS_STR-VORKZ sy-vline 
WA_PARAMS_STR-FLG_SEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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