ABAP Select data from SAP table DIWPS_ORDER_GEN_PARAM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DIWPS_ORDER_GEN_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 DIWPS_ORDER_GEN_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 DIWPS_ORDER_GEN_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_DIWPS_ORDER_GEN_PARAM TYPE STANDARD TABLE OF DIWPS_ORDER_GEN_PARAM,
      WA_DIWPS_ORDER_GEN_PARAM TYPE DIWPS_ORDER_GEN_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: <DIWPS_ORDER_GEN_PARAM> TYPE DIWPS_ORDER_GEN_PARAM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DIWPS_ORDER_GEN_PARAM
*  INTO TABLE @DATA(IT_DIWPS_ORDER_GEN_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_DIWPS_ORDER_GEN_PARAM INDEX 1 INTO DATA(WA_DIWPS_ORDER_GEN_PARAM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DIWPS_ORDER_GEN_PARAM>-CUOBJ = 1.
<DIWPS_ORDER_GEN_PARAM>-REVNR = 1.
<DIWPS_ORDER_GEN_PARAM>-PLNAL = 1.
<DIWPS_ORDER_GEN_PARAM>-PLNNR = 1.
<DIWPS_ORDER_GEN_PARAM>-PLNTY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DIWPS_ORDER_GEN_PARAM-REF_OBJECT, sy-vline,
  WA_DIWPS_ORDER_GEN_PARAM-CNTR, sy-vline,
  WA_DIWPS_ORDER_GEN_PARAM-AUART, sy-vline,
  WA_DIWPS_ORDER_GEN_PARAM-IWERK, sy-vline,
  WA_DIWPS_ORDER_GEN_PARAM-VAWRK, sy-vline,
  WA_DIWPS_ORDER_GEN_PARAM-VAPLZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DIWPS_ORDER_GEN_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_DIWPS_ORDER_GEN_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_DIWPS_ORDER_GEN_PARAM INTO WA_DIWPS_ORDER_GEN_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 PLNAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DIWPS_ORDER_GEN_PARAM-PLNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIWPS_ORDER_GEN_PARAM-PLNAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DIWPS_ORDER_GEN_PARAM-PLNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIWPS_ORDER_GEN_PARAM-PLNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DIWPS_ORDER_GEN_PARAM-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIWPS_ORDER_GEN_PARAM-EQUNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_DIWPS_ORDER_GEN_PARAM-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIWPS_ORDER_GEN_PARAM-TPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DIWPS_ORDER_GEN_PARAM-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIWPS_ORDER_GEN_PARAM-AUFNR.
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_DIWPS_ORDER_GEN_PARAM_STR, 
CUOBJ TYPE STRING,
REVNR TYPE STRING,
PLNAL TYPE STRING,
PLNNR TYPE STRING,
PLNTY TYPE STRING,
REF_OBJECT TYPE STRING,
CNTR TYPE STRING,
AUART TYPE STRING,
IWERK TYPE STRING,
VAWRK TYPE STRING,
VAPLZ TYPE STRING,
EQUNR TYPE STRING,
PM_OBJLIST TYPE STRING,
TPLNR TYPE STRING,
GSTRP TYPE STRING,
GLTRP TYPE STRING,
KTEXT TYPE STRING,
GSUZP TYPE STRING,
GLUZP TYPE STRING,
AUFNR TYPE STRING,
QMNUMS TYPE STRING,
PSASSIGN TYPE STRING,
CR_PARA_BT TYPE STRING,
PARA_PROC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DIWPS_ORDER_GEN_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_DIWPS_ORDER_GEN_PARAM_STR-CUOBJ sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-REVNR sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-PLNAL sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-PLNNR sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-PLNTY sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-REF_OBJECT sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-CNTR sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-AUART sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-IWERK sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-VAWRK sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-VAPLZ sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-EQUNR sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-PM_OBJLIST sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-TPLNR sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-GSTRP sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-GLTRP sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-KTEXT sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-GSUZP sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-GLUZP sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-AUFNR sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-QMNUMS sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-PSASSIGN sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-CR_PARA_BT sy-vline 
WA_DIWPS_ORDER_GEN_PARAM_STR-PARA_PROC sy-vline      INTO ld_text SEPARATED BY SPACE.

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