ABAP Select data from SAP table I156SC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP I156SC 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 I156SC. 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 I156SC 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_I156SC TYPE STANDARD TABLE OF I156SC,
      WA_I156SC TYPE I156SC,
      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: <I156SC> TYPE I156SC.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_I156SC.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM I156SC
  INTO TABLE IT_I156SC.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM I156SC
*  INTO TABLE @DATA(IT_I156SC2).
*--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_I156SC INDEX 1 INTO DATA(WA_I156SC2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_I156SC ASSIGNING <I156SC>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<I156SC>-RBLVS = 1.
<I156SC>-ANZRE = 1.
<I156SC>-UMRBL = 1.
<I156SC>-UMRBU = 1.
<I156SC>-XLIFO = 1.

ENDLOOP.

LOOP AT IT_I156SC INTO WA_I156SC.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_I156SC-XVERF, sy-vline,
  WA_I156SC-KZVBP, sy-vline,
  WA_I156SC-PRREG, sy-vline,
  WA_I156SC-OICONIND, sy-vline,
  WA_I156SC-OITRANSF, sy-vline,
  WA_I156SC-OIASTBW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_I156SC 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_I156SC 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_I156SC INTO WA_I156SC.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_I156SC_STR, 
RBLVS TYPE STRING,
ANZRE TYPE STRING,
UMRBL TYPE STRING,
UMRBU TYPE STRING,
XLIFO TYPE STRING,
XVERF TYPE STRING,
KZVBP TYPE STRING,
PRREG TYPE STRING,
OICONIND TYPE STRING,
OITRANSF TYPE STRING,
OIASTBW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_I156SC_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_I156SC_STR-RBLVS sy-vline 
WA_I156SC_STR-ANZRE sy-vline 
WA_I156SC_STR-UMRBL sy-vline 
WA_I156SC_STR-UMRBU sy-vline 
WA_I156SC_STR-XLIFO sy-vline 
WA_I156SC_STR-XVERF sy-vline 
WA_I156SC_STR-KZVBP sy-vline 
WA_I156SC_STR-PRREG sy-vline 
WA_I156SC_STR-OICONIND sy-vline 
WA_I156SC_STR-OITRANSF sy-vline 
WA_I156SC_STR-OIASTBW sy-vline      INTO ld_text SEPARATED BY SPACE.

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