ABAP Select data from SAP table /ECRS/WLEN_LOCAL_S into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /ECRS/WLEN_LOCAL_S 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 /ECRS/WLEN_LOCAL_S. 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 /ECRS/WLEN_LOCAL_S 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_/ECRS/WLEN_LOCAL_S TYPE STANDARD TABLE OF /ECRS/WLEN_LOCAL_S,
      WA_/ECRS/WLEN_LOCAL_S TYPE /ECRS/WLEN_LOCAL_S,
      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: </ECRS/WLEN_LOCAL_S> TYPE /ECRS/WLEN_LOCAL_S.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /ECRS/WLEN_LOCAL_S
  INTO TABLE IT_/ECRS/WLEN_LOCAL_S.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ECRS/WLEN_LOCAL_S
*  INTO TABLE @DATA(IT_/ECRS/WLEN_LOCAL_S2).
*--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_/ECRS/WLEN_LOCAL_S INDEX 1 INTO DATA(WA_/ECRS/WLEN_LOCAL_S2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/ECRS/WLEN_LOCAL_S ASSIGNING </ECRS/WLEN_LOCAL_S>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ECRS/WLEN_LOCAL_S>-POIID = 1.
</ECRS/WLEN_LOCAL_S>-RPYEA = 1.
</ECRS/WLEN_LOCAL_S>-RPMON = 1.
</ECRS/WLEN_LOCAL_S>-DIREC = 1.
</ECRS/WLEN_LOCAL_S>-GENES = 1.

ENDLOOP.

LOOP AT IT_/ECRS/WLEN_LOCAL_S INTO WA_/ECRS/WLEN_LOCAL_S.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ECRS/WLEN_LOCAL_S-WERKS, sy-vline,
  WA_/ECRS/WLEN_LOCAL_S-ENTYP, sy-vline,
  WA_/ECRS/WLEN_LOCAL_S-GFPIC, sy-vline,
  WA_/ECRS/WLEN_LOCAL_S-GFPIR, sy-vline,
  WA_/ECRS/WLEN_LOCAL_S-GFPTC, sy-vline,
  WA_/ECRS/WLEN_LOCAL_S-GFPTR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ECRS/WLEN_LOCAL_S 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_/ECRS/WLEN_LOCAL_S 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_/ECRS/WLEN_LOCAL_S INTO WA_/ECRS/WLEN_LOCAL_S.


*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 POIID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ECRS/WLEN_LOCAL_S-POIID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ECRS/WLEN_LOCAL_S-POIID.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/ECRS/WLEN_LOCAL_S-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ECRS/WLEN_LOCAL_S-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit ALPHA, internal->external for field RDNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ECRS/WLEN_LOCAL_S-RDNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ECRS/WLEN_LOCAL_S-RDNUM.
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_/ECRS/WLEN_LOCAL_S_STR, 
POIID TYPE STRING,
RPYEA TYPE STRING,
RPMON TYPE STRING,
DIREC TYPE STRING,
GENES TYPE STRING,
WERKS TYPE STRING,
ENTYP TYPE STRING,
GFPIC TYPE STRING,
GFPIR TYPE STRING,
GFPTC TYPE STRING,
GFPTR TYPE STRING,
VFPTV TYPE STRING,
MATNR TYPE STRING,
MAKTX TYPE STRING,
COMCD TYPE STRING,
CTYOO TYPE STRING,
REGOO TYPE STRING,
BTTYP TYPE STRING,
PRCDR TYPE STRING,
MOTAB TYPE STRING,
PORTI TYPE STRING,
NAOTV TYPE STRING,
INCTM TYPE STRING,
INCZO TYPE STRING,
SPMCO TYPE STRING,
INVAL TYPE STRING,
INCUR TYPE STRING,
STVAL TYPE STRING,
STCUR TYPE STRING,
IFVAL TYPE STRING,
FCCUR TYPE STRING,
NTWEI TYPE STRING,
NWUOM TYPE STRING,
SPQUA TYPE STRING,
SPUOM TYPE STRING,
ITQUA TYPE STRING,
ITUOM TYPE STRING,
SRVIT TYPE STRING,
ISVCO TYPE STRING,
PYCTY TYPE STRING,
ADDF1 TYPE STRING,
ADDF2 TYPE STRING,
ADDF3 TYPE STRING,
DOTYP TYPE STRING,
DONUM TYPE STRING,
DOITM TYPE STRING,
RDTYP TYPE STRING,
RDNUM TYPE STRING,
RDITM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ECRS/WLEN_LOCAL_S_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_/ECRS/WLEN_LOCAL_S_STR-POIID sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-RPYEA sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-RPMON sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-DIREC sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-GENES sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-WERKS sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-ENTYP sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-GFPIC sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-GFPIR sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-GFPTC sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-GFPTR sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-VFPTV sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-MATNR sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-MAKTX sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-COMCD sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-CTYOO sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-REGOO sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-BTTYP sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-PRCDR sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-MOTAB sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-PORTI sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-NAOTV sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-INCTM sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-INCZO sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-SPMCO sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-INVAL sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-INCUR sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-STVAL sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-STCUR sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-IFVAL sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-FCCUR sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-NTWEI sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-NWUOM sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-SPQUA sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-SPUOM sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-ITQUA sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-ITUOM sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-SRVIT sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-ISVCO sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-PYCTY sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-ADDF1 sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-ADDF2 sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-ADDF3 sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-DOTYP sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-DONUM sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-DOITM sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-RDTYP sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-RDNUM sy-vline 
WA_/ECRS/WLEN_LOCAL_S_STR-RDITM sy-vline      INTO ld_text SEPARATED BY SPACE.

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