ABAP Select data from SAP table EWAEL_WDPLANT_STRUCT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EWAEL_WDPLANT_STRUCT
*  INTO TABLE @DATA(IT_EWAEL_WDPLANT_STRUCT2).
*--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_EWAEL_WDPLANT_STRUCT INDEX 1 INTO DATA(WA_EWAEL_WDPLANT_STRUCT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EWAEL_WDPLANT_STRUCT>-WDPLANTTYPE = 1.
<EWAEL_WDPLANT_STRUCT>-ISXENOWDPLANT = 1.
<EWAEL_WDPLANT_STRUCT>-LIFNR = 1.
<EWAEL_WDPLANT_STRUCT>-TPLNR = 1.
<EWAEL_WDPLANT_STRUCT>-WERKS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EWAEL_WDPLANT_STRUCT-LGORT, sy-vline,
  WA_EWAEL_WDPLANT_STRUCT-LGNUM, sy-vline,
  WA_EWAEL_WDPLANT_STRUCT-PERSA, sy-vline,
  WA_EWAEL_WDPLANT_STRUCT-VKORG, sy-vline,
  WA_EWAEL_WDPLANT_STRUCT-VTWEG, sy-vline,
  WA_EWAEL_WDPLANT_STRUCT-SPART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EWAEL_WDPLANT_STRUCT 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_EWAEL_WDPLANT_STRUCT 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_EWAEL_WDPLANT_STRUCT INTO WA_EWAEL_WDPLANT_STRUCT.


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

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

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_EWAEL_WDPLANT_STRUCT-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EWAEL_WDPLANT_STRUCT-KUNNR.
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_EWAEL_WDPLANT_STRUCT_STR, 
WDPLANTTYPE TYPE STRING,
ISXENOWDPLANT TYPE STRING,
LIFNR TYPE STRING,
TPLNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
LGNUM TYPE STRING,
PERSA TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
KAPNAME TYPE STRING,
KAPART TYPE STRING,
KUNNR TYPE STRING,
DISPOSER_RECN TYPE STRING,
DISPOSER_ACTN TYPE STRING,
WEIGHINGFORM TYPE STRING,
PCKGOODSFORM TYPE STRING,
DESCRIPTION TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
NRO_WNUMBER TYPE STRING,
NRR_WNUMBER TYPE STRING,
WDF_OBJNR TYPE STRING,
HANDLINGTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EWAEL_WDPLANT_STRUCT_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_EWAEL_WDPLANT_STRUCT_STR-WDPLANTTYPE sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-ISXENOWDPLANT sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-LIFNR sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-TPLNR sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-WERKS sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-LGORT sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-LGNUM sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-PERSA sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-VKORG sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-VTWEG sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-SPART sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-KAPNAME sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-KAPART sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-KUNNR sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-DISPOSER_RECN sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-DISPOSER_ACTN sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-WEIGHINGFORM sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-PCKGOODSFORM sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-DESCRIPTION sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-EKORG sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-EKGRP sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-NRO_WNUMBER sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-NRR_WNUMBER sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-WDF_OBJNR sy-vline 
WA_EWAEL_WDPLANT_STRUCT_STR-HANDLINGTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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