ABAP Select data from SAP table ICAINVBILL_T into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICAINVBILL_T
*  INTO TABLE @DATA(IT_ICAINVBILL_T2).
*--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_ICAINVBILL_T INDEX 1 INTO DATA(WA_ICAINVBILL_T2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICAINVBILL_T>-MANDT = 1.
<ICAINVBILL_T>-CABILLGDOCUMENT = 1.
<ICAINVBILL_T>-CABILLGDOCTAXITEM = 1.
<ICAINVBILL_T>-CABILLGTAXGROUP = 1.
<ICAINVBILL_T>-CATAXAMOUNT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICAINVBILL_T-CABILLGCURRENCY, sy-vline,
  WA_ICAINVBILL_T-CATAXBASEAMOUNT, sy-vline,
  WA_ICAINVBILL_T-CATAXDATE, sy-vline,
  WA_ICAINVBILL_T-CABILLGTAXITEMEXTERNALSYSTEM, sy-vline,
  WA_ICAINVBILL_T-CAINVCGDOCITEMISREVERSAL, sy-vline,
  WA_ICAINVBILL_T-CATAXRATEINPERCENT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICAINVBILL_T 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_ICAINVBILL_T 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_ICAINVBILL_T INTO WA_ICAINVBILL_T.


*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_ICAINVBILL_T_STR, 
MANDT TYPE STRING,
CABILLGDOCUMENT TYPE STRING,
CABILLGDOCTAXITEM TYPE STRING,
CABILLGTAXGROUP TYPE STRING,
CATAXAMOUNT TYPE STRING,
CABILLGCURRENCY TYPE STRING,
CATAXBASEAMOUNT TYPE STRING,
CATAXDATE TYPE STRING,
CABILLGTAXITEMEXTERNALSYSTEM TYPE STRING,
CAINVCGDOCITEMISREVERSAL TYPE STRING,
CATAXRATEINPERCENT TYPE STRING,
CATRANSACTIONKEYACCOUNTDETN TYPE STRING,
CACONDITIONTYPE TYPE STRING,
CABILLGGROUPINGSOURCEITEMS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICAINVBILL_T_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_ICAINVBILL_T_STR-MANDT sy-vline 
WA_ICAINVBILL_T_STR-CABILLGDOCUMENT sy-vline 
WA_ICAINVBILL_T_STR-CABILLGDOCTAXITEM sy-vline 
WA_ICAINVBILL_T_STR-CABILLGTAXGROUP sy-vline 
WA_ICAINVBILL_T_STR-CATAXAMOUNT sy-vline 
WA_ICAINVBILL_T_STR-CABILLGCURRENCY sy-vline 
WA_ICAINVBILL_T_STR-CATAXBASEAMOUNT sy-vline 
WA_ICAINVBILL_T_STR-CATAXDATE sy-vline 
WA_ICAINVBILL_T_STR-CABILLGTAXITEMEXTERNALSYSTEM sy-vline 
WA_ICAINVBILL_T_STR-CAINVCGDOCITEMISREVERSAL sy-vline 
WA_ICAINVBILL_T_STR-CATAXRATEINPERCENT sy-vline 
WA_ICAINVBILL_T_STR-CATRANSACTIONKEYACCOUNTDETN sy-vline 
WA_ICAINVBILL_T_STR-CACONDITIONTYPE sy-vline 
WA_ICAINVBILL_T_STR-CABILLGGROUPINGSOURCEITEMS sy-vline      INTO ld_text SEPARATED BY SPACE.

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