ABAP Select data from SAP table WLF_PARTNER_CHANGE_PARAMETERS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLF_PARTNER_CHANGE_PARAMETERS
*  INTO TABLE @DATA(IT_WLF_PARTNER_CHANGE_PARAMETERS2).
*--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_WLF_PARTNER_CHANGE_PARAMETERS INDEX 1 INTO DATA(WA_WLF_PARTNER_CHANGE_PARAMETERS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLF_PARTNER_CHANGE_PARAMETERS>-DIFF_INV = 1.
<WLF_PARTNER_CHANGE_PARAMETERS>-ALT_PAYEE = 1.
<WLF_PARTNER_CHANGE_PARAMETERS>-BILL_TO = 1.
<WLF_PARTNER_CHANGE_PARAMETERS>-PAYER = 1.
<WLF_PARTNER_CHANGE_PARAMETERS>-CPDK_ADDR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLF_PARTNER_CHANGE_PARAMETERS-CPDL_ADDR, sy-vline,
  WA_WLF_PARTNER_CHANGE_PARAMETERS-VENDOR_AP, sy-vline,
  WA_WLF_PARTNER_CHANGE_PARAMETERS-IDO_TYPE_VENDOR, sy-vline,
  WA_WLF_PARTNER_CHANGE_PARAMETERS-ID_OBJECT_VENDOR, sy-vline,
  WA_WLF_PARTNER_CHANGE_PARAMETERS-IDO_TYPE_CUST, sy-vline,
  WA_WLF_PARTNER_CHANGE_PARAMETERS-ID_OBJECT_CUST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLF_PARTNER_CHANGE_PARAMETERS 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_WLF_PARTNER_CHANGE_PARAMETERS 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_WLF_PARTNER_CHANGE_PARAMETERS INTO WA_WLF_PARTNER_CHANGE_PARAMETERS.


*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 DIFF_INV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLF_PARTNER_CHANGE_PARAMETERS-DIFF_INV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_PARTNER_CHANGE_PARAMETERS-DIFF_INV.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field VENDOR_AP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLF_PARTNER_CHANGE_PARAMETERS-VENDOR_AP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_PARTNER_CHANGE_PARAMETERS-VENDOR_AP.
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_WLF_PARTNER_CHANGE_PARAMETERS_STR, 
DIFF_INV TYPE STRING,
ALT_PAYEE TYPE STRING,
BILL_TO TYPE STRING,
PAYER TYPE STRING,
CPDK_ADDR TYPE STRING,
CPDL_ADDR TYPE STRING,
VENDOR_AP TYPE STRING,
IDO_TYPE_VENDOR TYPE STRING,
ID_OBJECT_VENDOR TYPE STRING,
IDO_TYPE_CUST TYPE STRING,
ID_OBJECT_CUST TYPE STRING,
PURCH_ORG TYPE STRING,
PUR_GROUP TYPE STRING,
SALESORG TYPE STRING,
DISTR_CHAN TYPE STRING,
DIVISION TYPE STRING,
PRSDT_HEAD TYPE STRING,
FBUDA_HEAD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLF_PARTNER_CHANGE_PARAMETERS_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_WLF_PARTNER_CHANGE_PARAMETERS_STR-DIFF_INV sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-ALT_PAYEE sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-BILL_TO sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-PAYER sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-CPDK_ADDR sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-CPDL_ADDR sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-VENDOR_AP sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-IDO_TYPE_VENDOR sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-ID_OBJECT_VENDOR sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-IDO_TYPE_CUST sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-ID_OBJECT_CUST sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-PURCH_ORG sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-PUR_GROUP sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-SALESORG sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-DISTR_CHAN sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-DIVISION sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-PRSDT_HEAD sy-vline 
WA_WLF_PARTNER_CHANGE_PARAMETERS_STR-FBUDA_HEAD sy-vline      INTO ld_text SEPARATED BY SPACE.

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