ABAP Select data from SAP table WSTI_GM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WSTI_GM
*  INTO TABLE @DATA(IT_WSTI_GM2).
*--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_WSTI_GM INDEX 1 INTO DATA(WA_WSTI_GM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WSTI_GM>-MATNR = 1.
<WSTI_GM>-MBLNR = 1.
<WSTI_GM>-MJAHR = 1.
<WSTI_GM>-ZEILE = 1.
<WSTI_GM>-IBLNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WSTI_GM-GJAHR, sy-vline,
  WA_WSTI_GM-ZEILI, sy-vline,
  WA_WSTI_GM-CPU_DT, sy-vline,
  WA_WSTI_GM-BUDAT, sy-vline,
  WA_WSTI_GM-PACKAGE_ID, sy-vline,
  WA_WSTI_GM-ORIGIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WSTI_GM 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_WSTI_GM 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_WSTI_GM INTO WA_WSTI_GM.


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

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

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WSTI_GM-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTI_GM-MJAHR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit MATN1, internal->external for field MATBF
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WSTI_GM-MATBF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTI_GM-MATBF.
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_WSTI_GM_STR, 
MATNR TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
ZEILE TYPE STRING,
IBLNR TYPE STRING,
GJAHR TYPE STRING,
ZEILI TYPE STRING,
CPU_DT TYPE STRING,
BUDAT TYPE STRING,
PACKAGE_ID TYPE STRING,
ORIGIN TYPE STRING,
SOBKZ TYPE STRING,
LIFNR TYPE STRING,
CHARG TYPE STRING,
ERFME TYPE STRING,
MATBF TYPE STRING,
AGG_VALUE_ART TYPE STRING,
RACK_JOBBER TYPE STRING,
XBUIB_DONE TYPE STRING,
BEFORE TYPE STRING,
AFTER TYPE STRING,
REVERSAL TYPE STRING,
DOCNUM TYPE STRING,
RETAIL_CSGMT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WSTI_GM_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_WSTI_GM_STR-MATNR sy-vline 
WA_WSTI_GM_STR-MBLNR sy-vline 
WA_WSTI_GM_STR-MJAHR sy-vline 
WA_WSTI_GM_STR-ZEILE sy-vline 
WA_WSTI_GM_STR-IBLNR sy-vline 
WA_WSTI_GM_STR-GJAHR sy-vline 
WA_WSTI_GM_STR-ZEILI sy-vline 
WA_WSTI_GM_STR-CPU_DT sy-vline 
WA_WSTI_GM_STR-BUDAT sy-vline 
WA_WSTI_GM_STR-PACKAGE_ID sy-vline 
WA_WSTI_GM_STR-ORIGIN sy-vline 
WA_WSTI_GM_STR-SOBKZ sy-vline 
WA_WSTI_GM_STR-LIFNR sy-vline 
WA_WSTI_GM_STR-CHARG sy-vline 
WA_WSTI_GM_STR-ERFME sy-vline 
WA_WSTI_GM_STR-MATBF sy-vline 
WA_WSTI_GM_STR-AGG_VALUE_ART sy-vline 
WA_WSTI_GM_STR-RACK_JOBBER sy-vline 
WA_WSTI_GM_STR-XBUIB_DONE sy-vline 
WA_WSTI_GM_STR-BEFORE sy-vline 
WA_WSTI_GM_STR-AFTER sy-vline 
WA_WSTI_GM_STR-REVERSAL sy-vline 
WA_WSTI_GM_STR-DOCNUM sy-vline 
WA_WSTI_GM_STR-RETAIL_CSGMT sy-vline      INTO ld_text SEPARATED BY SPACE.

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