ABAP Select data from SAP table IINSTOHIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IINSTOHIST
*  INTO TABLE @DATA(IT_IINSTOHIST2).
*--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_IINSTOHIST INDEX 1 INTO DATA(WA_IINSTOHIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IINSTOHIST>-MANDT = 1.
<IINSTOHIST>-PURCHASINGDOCUMENT = 1.
<IINSTOHIST>-PURCHASINGDOCUMENTITEM = 1.
<IINSTOHIST>-ACCOUNTASSIGNMENTNUMBER = 1.
<IINSTOHIST>-PURCHASINGHISTORYDOCUMENTTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IINSTOHIST-PURCHASINGHISTORYDOCUMENTYEAR, sy-vline,
  WA_IINSTOHIST-PURCHASINGHISTORYDOCUMENT, sy-vline,
  WA_IINSTOHIST-PURCHASINGHISTORYDOCUMENTITEM, sy-vline,
  WA_IINSTOHIST-STOCREATIONDATE, sy-vline,
  WA_IINSTOHIST-POSTINGDATE, sy-vline,
  WA_IINSTOHIST-COMPANYCODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IINSTOHIST 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_IINSTOHIST 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_IINSTOHIST INTO WA_IINSTOHIST.


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

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

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

*Conversion exit ALPHA, internal->external for field SUPPLIER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IINSTOHIST-SUPPLIER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IINSTOHIST-SUPPLIER.
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_IINSTOHIST_STR, 
MANDT TYPE STRING,
PURCHASINGDOCUMENT TYPE STRING,
PURCHASINGDOCUMENTITEM TYPE STRING,
ACCOUNTASSIGNMENTNUMBER TYPE STRING,
PURCHASINGHISTORYDOCUMENTTYPE TYPE STRING,
PURCHASINGHISTORYDOCUMENTYEAR TYPE STRING,
PURCHASINGHISTORYDOCUMENT TYPE STRING,
PURCHASINGHISTORYDOCUMENTITEM TYPE STRING,
STOCREATIONDATE TYPE STRING,
POSTINGDATE TYPE STRING,
COMPANYCODE TYPE STRING,
SUPPLIER TYPE STRING,
SUPPLYINGPLANT TYPE STRING,
PLANT TYPE STRING,
PURCHASINGDOCUMENTCATEGORY TYPE STRING,
PURCHASINGHISTORYCATEGORY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IINSTOHIST_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_IINSTOHIST_STR-MANDT sy-vline 
WA_IINSTOHIST_STR-PURCHASINGDOCUMENT sy-vline 
WA_IINSTOHIST_STR-PURCHASINGDOCUMENTITEM sy-vline 
WA_IINSTOHIST_STR-ACCOUNTASSIGNMENTNUMBER sy-vline 
WA_IINSTOHIST_STR-PURCHASINGHISTORYDOCUMENTTYPE sy-vline 
WA_IINSTOHIST_STR-PURCHASINGHISTORYDOCUMENTYEAR sy-vline 
WA_IINSTOHIST_STR-PURCHASINGHISTORYDOCUMENT sy-vline 
WA_IINSTOHIST_STR-PURCHASINGHISTORYDOCUMENTITEM sy-vline 
WA_IINSTOHIST_STR-STOCREATIONDATE sy-vline 
WA_IINSTOHIST_STR-POSTINGDATE sy-vline 
WA_IINSTOHIST_STR-COMPANYCODE sy-vline 
WA_IINSTOHIST_STR-SUPPLIER sy-vline 
WA_IINSTOHIST_STR-SUPPLYINGPLANT sy-vline 
WA_IINSTOHIST_STR-PLANT sy-vline 
WA_IINSTOHIST_STR-PURCHASINGDOCUMENTCATEGORY sy-vline 
WA_IINSTOHIST_STR-PURCHASINGHISTORYCATEGORY sy-vline      INTO ld_text SEPARATED BY SPACE.

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