ABAP Select data from SAP table T090C into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T090C 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 T090C. 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 T090C 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_T090C TYPE STANDARD TABLE OF T090C,
      WA_T090C TYPE T090C,
      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: <T090C> TYPE T090C.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T090C.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T090C
  INTO TABLE IT_T090C.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T090C
*  INTO TABLE @DATA(IT_T090C2).
*--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_T090C INDEX 1 INTO DATA(WA_T090C2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T090C ASSIGNING <T090C>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T090C>-MANDT = 1.
<T090C>-AFAPL = 1.
<T090C>-AFASL = 1.
<T090C>-NAFASL = 1.
<T090C>-SAFASL = 1.

ENDLOOP.

LOOP AT IT_T090C INTO WA_T090C.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T090C-ZINSSL, sy-vline,
  WA_T090C-ANHWSL, sy-vline,
  WA_T090C-XNAAUS, sy-vline,
  WA_T090C-XZIAUS, sy-vline,
  WA_T090C-NAFVER, sy-vline,
  WA_T090C-XNAZUG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T090C 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_T090C 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_T090C INTO WA_T090C.


*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_T090C_STR, 
MANDT TYPE STRING,
AFAPL TYPE STRING,
AFASL TYPE STRING,
NAFASL TYPE STRING,
SAFASL TYPE STRING,
ZINSSL TYPE STRING,
ANHWSL TYPE STRING,
XNAAUS TYPE STRING,
XZIAUS TYPE STRING,
NAFVER TYPE STRING,
XNAZUG TYPE STRING,
XPERGJ TYPE STRING,
PROZST TYPE STRING,
XUMZUG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T090C_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_T090C_STR-MANDT sy-vline 
WA_T090C_STR-AFAPL sy-vline 
WA_T090C_STR-AFASL sy-vline 
WA_T090C_STR-NAFASL sy-vline 
WA_T090C_STR-SAFASL sy-vline 
WA_T090C_STR-ZINSSL sy-vline 
WA_T090C_STR-ANHWSL sy-vline 
WA_T090C_STR-XNAAUS sy-vline 
WA_T090C_STR-XZIAUS sy-vline 
WA_T090C_STR-NAFVER sy-vline 
WA_T090C_STR-XNAZUG sy-vline 
WA_T090C_STR-XPERGJ sy-vline 
WA_T090C_STR-PROZST sy-vline 
WA_T090C_STR-XUMZUG sy-vline      INTO ld_text SEPARATED BY SPACE.

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