ABAP Select data from SAP table T604_PREF_PARAM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T604_PREF_PARAM 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 T604_PREF_PARAM. 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 T604_PREF_PARAM 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_T604_PREF_PARAM TYPE STANDARD TABLE OF T604_PREF_PARAM,
      WA_T604_PREF_PARAM TYPE T604_PREF_PARAM,
      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: <T604_PREF_PARAM> TYPE T604_PREF_PARAM.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T604_PREF_PARAM.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T604_PREF_PARAM
  INTO TABLE IT_T604_PREF_PARAM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T604_PREF_PARAM
*  INTO TABLE @DATA(IT_T604_PREF_PARAM2).
*--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_T604_PREF_PARAM INDEX 1 INTO DATA(WA_T604_PREF_PARAM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T604_PREF_PARAM ASSIGNING <T604_PREF_PARAM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T604_PREF_PARAM>-MANDT = 1.
<T604_PREF_PARAM>-LAND1 = 1.
<T604_PREF_PARAM>-PWGGR = 1.
<T604_PREF_PARAM>-WERKS = 1.
<T604_PREF_PARAM>-KALK_ART = 1.

ENDLOOP.

LOOP AT IT_T604_PREF_PARAM INTO WA_T604_PREF_PARAM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T604_PREF_PARAM-STLAN, sy-vline,
  WA_T604_PREF_PARAM-CAPID, sy-vline,
  WA_T604_PREF_PARAM-STLAL, sy-vline,
  WA_T604_PREF_PARAM-RNDKZ, sy-vline,
  WA_T604_PREF_PARAM-SANFE, sy-vline,
  WA_T604_PREF_PARAM-SANKA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T604_PREF_PARAM 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_T604_PREF_PARAM 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_T604_PREF_PARAM INTO WA_T604_PREF_PARAM.


*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 ALPHA, internal->external for field STLAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T604_PREF_PARAM-STLAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T604_PREF_PARAM-STLAL.
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_T604_PREF_PARAM_STR, 
MANDT TYPE STRING,
LAND1 TYPE STRING,
PWGGR TYPE STRING,
WERKS TYPE STRING,
KALK_ART TYPE STRING,
STLAN TYPE STRING,
CAPID TYPE STRING,
STLAL TYPE STRING,
RNDKZ TYPE STRING,
SANFE TYPE STRING,
SANKA TYPE STRING,
SANIN TYPE STRING,
SANKO TYPE STRING,
RVREL TYPE STRING,
PWLEN TYPE STRING,
PEINH TYPE STRING,
MDMPS TYPE STRING,
PROZEN TYPE STRING,
P_BET_A TYPE STRING,
P_BETOL TYPE STRING,
L_CUST TYPE STRING,
L_CONT TYPE STRING,
L_ERROR TYPE STRING,
L_DATA TYPE STRING,
KALK_AUTO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T604_PREF_PARAM_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_T604_PREF_PARAM_STR-MANDT sy-vline 
WA_T604_PREF_PARAM_STR-LAND1 sy-vline 
WA_T604_PREF_PARAM_STR-PWGGR sy-vline 
WA_T604_PREF_PARAM_STR-WERKS sy-vline 
WA_T604_PREF_PARAM_STR-KALK_ART sy-vline 
WA_T604_PREF_PARAM_STR-STLAN sy-vline 
WA_T604_PREF_PARAM_STR-CAPID sy-vline 
WA_T604_PREF_PARAM_STR-STLAL sy-vline 
WA_T604_PREF_PARAM_STR-RNDKZ sy-vline 
WA_T604_PREF_PARAM_STR-SANFE sy-vline 
WA_T604_PREF_PARAM_STR-SANKA sy-vline 
WA_T604_PREF_PARAM_STR-SANIN sy-vline 
WA_T604_PREF_PARAM_STR-SANKO sy-vline 
WA_T604_PREF_PARAM_STR-RVREL sy-vline 
WA_T604_PREF_PARAM_STR-PWLEN sy-vline 
WA_T604_PREF_PARAM_STR-PEINH sy-vline 
WA_T604_PREF_PARAM_STR-MDMPS sy-vline 
WA_T604_PREF_PARAM_STR-PROZEN sy-vline 
WA_T604_PREF_PARAM_STR-P_BET_A sy-vline 
WA_T604_PREF_PARAM_STR-P_BETOL sy-vline 
WA_T604_PREF_PARAM_STR-L_CUST sy-vline 
WA_T604_PREF_PARAM_STR-L_CONT sy-vline 
WA_T604_PREF_PARAM_STR-L_ERROR sy-vline 
WA_T604_PREF_PARAM_STR-L_DATA sy-vline 
WA_T604_PREF_PARAM_STR-KALK_AUTO sy-vline      INTO ld_text SEPARATED BY SPACE.

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