ABAP Select data from SAP table SIW_STRN_CLASS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SIW_STRN_CLASS
*  INTO TABLE @DATA(IT_SIW_STRN_CLASS2).
*--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_SIW_STRN_CLASS INDEX 1 INTO DATA(WA_SIW_STRN_CLASS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SIW_STRN_CLASS>-STR_CLASS = 1.
<SIW_STRN_CLASS>-CLSNAME = 1.
<SIW_STRN_CLASS>-VERSION = 1.
<SIW_STRN_CLASS>-LANGU = 1.
<SIW_STRN_CLASS>-DESCRIPT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SIW_STRN_CLASS-UUID, sy-vline,
  WA_SIW_STRN_CLASS-CATEGORY, sy-vline,
  WA_SIW_STRN_CLASS-EXPOSURE, sy-vline,
  WA_SIW_STRN_CLASS-STATE, sy-vline,
  WA_SIW_STRN_CLASS-RELEASE, sy-vline,
  WA_SIW_STRN_CLASS-AUTHOR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SIW_STRN_CLASS 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_SIW_STRN_CLASS 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_SIW_STRN_CLASS INTO WA_SIW_STRN_CLASS.


*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 ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_SIW_STRN_CLASS-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SIW_STRN_CLASS-LANGU.
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_SIW_STRN_CLASS_STR, 
STR_CLASS TYPE STRING,
CLSNAME TYPE STRING,
VERSION TYPE STRING,
LANGU TYPE STRING,
DESCRIPT TYPE STRING,
UUID TYPE STRING,
CATEGORY TYPE STRING,
EXPOSURE TYPE STRING,
STATE TYPE STRING,
RELEASE TYPE STRING,
AUTHOR TYPE STRING,
CREATEDON TYPE STRING,
CHANGEDBY TYPE STRING,
CHANGEDON TYPE STRING,
CHGDANYBY TYPE STRING,
CHGDANYON TYPE STRING,
CLSEMBED TYPE STRING,
CLSABSTRCT TYPE STRING,
CLSFINAL TYPE STRING,
CLSCCINCL TYPE STRING,
REMOTE TYPE STRING,
FIXPT TYPE STRING,
VARCL TYPE STRING,
UNICODE TYPE STRING,
RSTAT TYPE STRING,
CLSDEFATT TYPE STRING,
CLSDEFMTD TYPE STRING,
CLSDEFINT TYPE STRING,
CLSBCIMPL TYPE STRING,
R3RELEASE TYPE STRING,
CLSBCTRANS TYPE STRING,
CLSBCCAT TYPE STRING,
CLSADDON TYPE STRING,
MSG_ID TYPE STRING,
CLSBCNODEL TYPE STRING,
CLSPROXY TYPE STRING,
CLSSHAREDMEMORY TYPE STRING,
WITH_UNIT_TESTS TYPE STRING,
DURATION_TYPE TYPE STRING,
RISK_LEVEL TYPE STRING,
WITHIN_PACKAGE TYPE STRING,
TAB_ATTRIBUTES TYPE STRING,
TAB_METHODS TYPE STRING,
TAB_EVENTS TYPE STRING,
TAB_PARAMETERS TYPE STRING,
TAB_EXCEPTIONS TYPE STRING,
TAB_IMPLEMENTINGS TYPE STRING,
TAB_INHERITANCE TYPE STRING,
TAB_ALIASES TYPE STRING,
TAB_REDEFINITIONS TYPE STRING,
TAB_FRIENDS TYPE STRING,
TAB_INCLUDES TYPE STRING,
TAB_EXPL_IMPLEMENTINGS TYPE STRING,
TAB_IMPL_DETAILS TYPE STRING,
TAB_TYPES TYPE STRING,
TAB_TYPEPUSAGES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SIW_STRN_CLASS_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_SIW_STRN_CLASS_STR-STR_CLASS sy-vline 
WA_SIW_STRN_CLASS_STR-CLSNAME sy-vline 
WA_SIW_STRN_CLASS_STR-VERSION sy-vline 
WA_SIW_STRN_CLASS_STR-LANGU sy-vline 
WA_SIW_STRN_CLASS_STR-DESCRIPT sy-vline 
WA_SIW_STRN_CLASS_STR-UUID sy-vline 
WA_SIW_STRN_CLASS_STR-CATEGORY sy-vline 
WA_SIW_STRN_CLASS_STR-EXPOSURE sy-vline 
WA_SIW_STRN_CLASS_STR-STATE sy-vline 
WA_SIW_STRN_CLASS_STR-RELEASE sy-vline 
WA_SIW_STRN_CLASS_STR-AUTHOR sy-vline 
WA_SIW_STRN_CLASS_STR-CREATEDON sy-vline 
WA_SIW_STRN_CLASS_STR-CHANGEDBY sy-vline 
WA_SIW_STRN_CLASS_STR-CHANGEDON sy-vline 
WA_SIW_STRN_CLASS_STR-CHGDANYBY sy-vline 
WA_SIW_STRN_CLASS_STR-CHGDANYON sy-vline 
WA_SIW_STRN_CLASS_STR-CLSEMBED sy-vline 
WA_SIW_STRN_CLASS_STR-CLSABSTRCT sy-vline 
WA_SIW_STRN_CLASS_STR-CLSFINAL sy-vline 
WA_SIW_STRN_CLASS_STR-CLSCCINCL sy-vline 
WA_SIW_STRN_CLASS_STR-REMOTE sy-vline 
WA_SIW_STRN_CLASS_STR-FIXPT sy-vline 
WA_SIW_STRN_CLASS_STR-VARCL sy-vline 
WA_SIW_STRN_CLASS_STR-UNICODE sy-vline 
WA_SIW_STRN_CLASS_STR-RSTAT sy-vline 
WA_SIW_STRN_CLASS_STR-CLSDEFATT sy-vline 
WA_SIW_STRN_CLASS_STR-CLSDEFMTD sy-vline 
WA_SIW_STRN_CLASS_STR-CLSDEFINT sy-vline 
WA_SIW_STRN_CLASS_STR-CLSBCIMPL sy-vline 
WA_SIW_STRN_CLASS_STR-R3RELEASE sy-vline 
WA_SIW_STRN_CLASS_STR-CLSBCTRANS sy-vline 
WA_SIW_STRN_CLASS_STR-CLSBCCAT sy-vline 
WA_SIW_STRN_CLASS_STR-CLSADDON sy-vline 
WA_SIW_STRN_CLASS_STR-MSG_ID sy-vline 
WA_SIW_STRN_CLASS_STR-CLSBCNODEL sy-vline 
WA_SIW_STRN_CLASS_STR-CLSPROXY sy-vline 
WA_SIW_STRN_CLASS_STR-CLSSHAREDMEMORY sy-vline 
WA_SIW_STRN_CLASS_STR-WITH_UNIT_TESTS sy-vline 
WA_SIW_STRN_CLASS_STR-DURATION_TYPE sy-vline 
WA_SIW_STRN_CLASS_STR-RISK_LEVEL sy-vline 
WA_SIW_STRN_CLASS_STR-WITHIN_PACKAGE sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_ATTRIBUTES sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_METHODS sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_EVENTS sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_PARAMETERS sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_EXCEPTIONS sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_IMPLEMENTINGS sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_INHERITANCE sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_ALIASES sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_REDEFINITIONS sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_FRIENDS sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_INCLUDES sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_EXPL_IMPLEMENTINGS sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_IMPL_DETAILS sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_TYPES sy-vline 
WA_SIW_STRN_CLASS_STR-TAB_TYPEPUSAGES sy-vline      INTO ld_text SEPARATED BY SPACE.

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