ABAP Select data from SAP table WSTR_IN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WSTR_IN
*  INTO TABLE @DATA(IT_WSTR_IN2).
*--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_WSTR_IN INDEX 1 INTO DATA(WA_WSTR_IN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WSTR_IN>-STLTY = 1.
<WSTR_IN>-STLAN = 1.
<WSTR_IN>-STLNR = 1.
<WSTR_IN>-STLAL = 1.
<WSTR_IN>-POSTP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WSTR_IN-CSTEXT, sy-vline,
  WA_WSTR_IN-MODUS, sy-vline,
  WA_WSTR_IN-INT_MODUS, sy-vline,
  WA_WSTR_IN-UNIT_MODUS, sy-vline,
  WA_WSTR_IN-MATNR, sy-vline,
  WA_WSTR_IN-SATNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WSTR_IN 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_WSTR_IN 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_WSTR_IN INTO WA_WSTR_IN.


*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 NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_WSTR_IN-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTR_IN-STLNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WSTR_IN-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTR_IN-AENNR.
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_WSTR_IN_STR, 
STLTY TYPE STRING,
STLAN TYPE STRING,
STLNR TYPE STRING,
STLAL TYPE STRING,
POSTP TYPE STRING,
CSTEXT TYPE STRING,
MODUS TYPE STRING,
INT_MODUS TYPE STRING,
UNIT_MODUS TYPE STRING,
MATNR TYPE STRING,
SATNR TYPE STRING,
MTART TYPE STRING,
MAKTH TYPE STRING,
MATKL TYPE STRING,
WGBEZ TYPE STRING,
STRTP TYPE STRING,
MEINH TYPE STRING,
MEINT TYPE STRING,
BMEIN TYPE STRING,
AENNR TYPE STRING,
DATUV TYPE STRING,
DATUB TYPE STRING,
SUBRC TYPE STRING,
OKCOD TYPE STRING,
ENQUM TYPE STRING,
NOCOM TYPE STRING,
COMWT TYPE STRING,
NEWIT TYPE STRING,
FLGAEN TYPE STRING,
MATKL_CHECKED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WSTR_IN_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_WSTR_IN_STR-STLTY sy-vline 
WA_WSTR_IN_STR-STLAN sy-vline 
WA_WSTR_IN_STR-STLNR sy-vline 
WA_WSTR_IN_STR-STLAL sy-vline 
WA_WSTR_IN_STR-POSTP sy-vline 
WA_WSTR_IN_STR-CSTEXT sy-vline 
WA_WSTR_IN_STR-MODUS sy-vline 
WA_WSTR_IN_STR-INT_MODUS sy-vline 
WA_WSTR_IN_STR-UNIT_MODUS sy-vline 
WA_WSTR_IN_STR-MATNR sy-vline 
WA_WSTR_IN_STR-SATNR sy-vline 
WA_WSTR_IN_STR-MTART sy-vline 
WA_WSTR_IN_STR-MAKTH sy-vline 
WA_WSTR_IN_STR-MATKL sy-vline 
WA_WSTR_IN_STR-WGBEZ sy-vline 
WA_WSTR_IN_STR-STRTP sy-vline 
WA_WSTR_IN_STR-MEINH sy-vline 
WA_WSTR_IN_STR-MEINT sy-vline 
WA_WSTR_IN_STR-BMEIN sy-vline 
WA_WSTR_IN_STR-AENNR sy-vline 
WA_WSTR_IN_STR-DATUV sy-vline 
WA_WSTR_IN_STR-DATUB sy-vline 
WA_WSTR_IN_STR-SUBRC sy-vline 
WA_WSTR_IN_STR-OKCOD sy-vline 
WA_WSTR_IN_STR-ENQUM sy-vline 
WA_WSTR_IN_STR-NOCOM sy-vline 
WA_WSTR_IN_STR-COMWT sy-vline 
WA_WSTR_IN_STR-NEWIT sy-vline 
WA_WSTR_IN_STR-FLGAEN sy-vline 
WA_WSTR_IN_STR-MATKL_CHECKED sy-vline      INTO ld_text SEPARATED BY SPACE.

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