ABAP Select data from SAP table IINSTOBILLING into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IINSTOBILLING
*  INTO TABLE @DATA(IT_IINSTOBILLING2).
*--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_IINSTOBILLING INDEX 1 INTO DATA(WA_IINSTOBILLING2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IINSTOBILLING>-MANDT = 1.
<IINSTOBILLING>-PURCHASINGDOCUMENT = 1.
<IINSTOBILLING>-PURCHASINGHISTORYDOCUMENTTYPE = 1.
<IINSTOBILLING>-PURCHASINGHISTORYDOCUMENTYEAR = 1.
<IINSTOBILLING>-PURCHASINGHISTORYDOCUMENT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IINSTOBILLING-STOCREATIONDATE, sy-vline,
  WA_IINSTOBILLING-COMPANYCODE, sy-vline,
  WA_IINSTOBILLING-SUPPLIER, sy-vline,
  WA_IINSTOBILLING-SUPPLYINGPLANT, sy-vline,
  WA_IINSTOBILLING-PLANT, sy-vline,
  WA_IINSTOBILLING-PURCHASINGDOCUMENTCATEGORY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IINSTOBILLING 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_IINSTOBILLING 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_IINSTOBILLING INTO WA_IINSTOBILLING.


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

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

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

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

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

*Conversion exit ALPHA, internal->external for field SUBSEQUENTDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IINSTOBILLING-SUBSEQUENTDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IINSTOBILLING-SUBSEQUENTDOCUMENT.
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_IINSTOBILLING_STR, 
MANDT TYPE STRING,
PURCHASINGDOCUMENT TYPE STRING,
PURCHASINGHISTORYDOCUMENTTYPE TYPE STRING,
PURCHASINGHISTORYDOCUMENTYEAR TYPE STRING,
PURCHASINGHISTORYDOCUMENT TYPE STRING,
STOCREATIONDATE TYPE STRING,
COMPANYCODE TYPE STRING,
SUPPLIER TYPE STRING,
SUPPLYINGPLANT TYPE STRING,
PLANT TYPE STRING,
PURCHASINGDOCUMENTCATEGORY TYPE STRING,
PURCHASINGHISTORYCATEGORY TYPE STRING,
POSTINGDATE TYPE STRING,
BILLINGDOCUMENT TYPE STRING,
CREATIONDATE TYPE STRING,
DOCUMENTREFERENCEID TYPE STRING,
SUBSEQUENTDOCUMENT TYPE STRING,
BILLINGDOCUMENTTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IINSTOBILLING_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_IINSTOBILLING_STR-MANDT sy-vline 
WA_IINSTOBILLING_STR-PURCHASINGDOCUMENT sy-vline 
WA_IINSTOBILLING_STR-PURCHASINGHISTORYDOCUMENTTYPE sy-vline 
WA_IINSTOBILLING_STR-PURCHASINGHISTORYDOCUMENTYEAR sy-vline 
WA_IINSTOBILLING_STR-PURCHASINGHISTORYDOCUMENT sy-vline 
WA_IINSTOBILLING_STR-STOCREATIONDATE sy-vline 
WA_IINSTOBILLING_STR-COMPANYCODE sy-vline 
WA_IINSTOBILLING_STR-SUPPLIER sy-vline 
WA_IINSTOBILLING_STR-SUPPLYINGPLANT sy-vline 
WA_IINSTOBILLING_STR-PLANT sy-vline 
WA_IINSTOBILLING_STR-PURCHASINGDOCUMENTCATEGORY sy-vline 
WA_IINSTOBILLING_STR-PURCHASINGHISTORYCATEGORY sy-vline 
WA_IINSTOBILLING_STR-POSTINGDATE sy-vline 
WA_IINSTOBILLING_STR-BILLINGDOCUMENT sy-vline 
WA_IINSTOBILLING_STR-CREATIONDATE sy-vline 
WA_IINSTOBILLING_STR-DOCUMENTREFERENCEID sy-vline 
WA_IINSTOBILLING_STR-SUBSEQUENTDOCUMENT sy-vline 
WA_IINSTOBILLING_STR-BILLINGDOCUMENTTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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