ABAP Select data from SAP table IINSTODOC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IINSTODOC
*  INTO TABLE @DATA(IT_IINSTODOC2).
*--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_IINSTODOC INDEX 1 INTO DATA(WA_IINSTODOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IINSTODOC>-MANDT = 1.
<IINSTODOC>-PURCHASINGDOCUMENT = 1.
<IINSTODOC>-DELIVERYDOCUMENT = 1.
<IINSTODOC>-ACCOUNTINGDOCUMENT = 1.
<IINSTODOC>-PURCHASINGHISTORYDOCUMENTTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IINSTODOC-PURCHASINGHISTORYDOCUMENTYEAR, sy-vline,
  WA_IINSTODOC-STOCREATIONDATE, sy-vline,
  WA_IINSTODOC-CREATIONDATEYEAR, sy-vline,
  WA_IINSTODOC-CREATIONDATEMONTH, sy-vline,
  WA_IINSTODOC-COMPANYCODE, sy-vline,
  WA_IINSTODOC-SUPPLYINGPLANT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IINSTODOC 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_IINSTODOC 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_IINSTODOC INTO WA_IINSTODOC.


*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_IINSTODOC-PURCHASINGDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IINSTODOC-PURCHASINGDOCUMENT.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit ALPHA, internal->external for field SUBSEQUENTDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IINSTODOC-SUBSEQUENTDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IINSTODOC-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_IINSTODOC_STR, 
MANDT TYPE STRING,
PURCHASINGDOCUMENT TYPE STRING,
DELIVERYDOCUMENT TYPE STRING,
ACCOUNTINGDOCUMENT TYPE STRING,
PURCHASINGHISTORYDOCUMENTTYPE TYPE STRING,
PURCHASINGHISTORYDOCUMENTYEAR TYPE STRING,
STOCREATIONDATE TYPE STRING,
CREATIONDATEYEAR TYPE STRING,
CREATIONDATEMONTH TYPE STRING,
COMPANYCODE TYPE STRING,
SUPPLYINGPLANT TYPE STRING,
RECEIVINGPLANT TYPE STRING,
PURCHASINGDOCUMENTCATEGORY TYPE STRING,
PURCHASINGHISTORYCATEGORY TYPE STRING,
BILLINGDOCUMENT TYPE STRING,
BILLINGDOCCREATIONDATE TYPE STRING,
DOCUMENTREFERENCEID TYPE STRING,
BILLINGDOCUMENTTYPE TYPE STRING,
POSTINGDATE TYPE STRING,
EXTERNALDOCUMENTREFERENCEID TYPE STRING,
SUBSEQUENTDOCUMENT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IINSTODOC_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_IINSTODOC_STR-MANDT sy-vline 
WA_IINSTODOC_STR-PURCHASINGDOCUMENT sy-vline 
WA_IINSTODOC_STR-DELIVERYDOCUMENT sy-vline 
WA_IINSTODOC_STR-ACCOUNTINGDOCUMENT sy-vline 
WA_IINSTODOC_STR-PURCHASINGHISTORYDOCUMENTTYPE sy-vline 
WA_IINSTODOC_STR-PURCHASINGHISTORYDOCUMENTYEAR sy-vline 
WA_IINSTODOC_STR-STOCREATIONDATE sy-vline 
WA_IINSTODOC_STR-CREATIONDATEYEAR sy-vline 
WA_IINSTODOC_STR-CREATIONDATEMONTH sy-vline 
WA_IINSTODOC_STR-COMPANYCODE sy-vline 
WA_IINSTODOC_STR-SUPPLYINGPLANT sy-vline 
WA_IINSTODOC_STR-RECEIVINGPLANT sy-vline 
WA_IINSTODOC_STR-PURCHASINGDOCUMENTCATEGORY sy-vline 
WA_IINSTODOC_STR-PURCHASINGHISTORYCATEGORY sy-vline 
WA_IINSTODOC_STR-BILLINGDOCUMENT sy-vline 
WA_IINSTODOC_STR-BILLINGDOCCREATIONDATE sy-vline 
WA_IINSTODOC_STR-DOCUMENTREFERENCEID sy-vline 
WA_IINSTODOC_STR-BILLINGDOCUMENTTYPE sy-vline 
WA_IINSTODOC_STR-POSTINGDATE sy-vline 
WA_IINSTODOC_STR-EXTERNALDOCUMENTREFERENCEID sy-vline 
WA_IINSTODOC_STR-SUBSEQUENTDOCUMENT sy-vline      INTO ld_text SEPARATED BY SPACE.

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