ABAP Select data from SAP table INSTSET into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM INSTSET
*  INTO TABLE @DATA(IT_INSTSET2).
*--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_INSTSET INDEX 1 INTO DATA(WA_INSTSET2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<INSTSET>-MANDT = 1.
<INSTSET>-SETNO = 1.
<INSTSET>-MSGID = 1.
<INSTSET>-MSGNO = 1.
<INSTSET>-ANLAGE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_INSTSET-MSGV1, sy-vline,
  WA_INSTSET-MSGV2, sy-vline,
  WA_INSTSET-MSGV3, sy-vline,
  WA_INSTSET-MSGV4, sy-vline,
  WA_INSTSET-EROEDAT, sy-vline,
  WA_INSTSET-ABRDATS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_INSTSET 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_INSTSET 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_INSTSET INTO WA_INSTSET.


*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 ANLAGE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_INSTSET-ANLAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_INSTSET-ANLAGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_INSTSET-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_INSTSET-BELNR.
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_INSTSET_STR, 
MANDT TYPE STRING,
SETNO TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
ANLAGE TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
EROEDAT TYPE STRING,
ABRDATS TYPE STRING,
ABRVORG TYPE STRING,
ERRORCT TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
MAN_WORK TYPE STRING,
AUTREP TYPE STRING,
SEMREL TYPE STRING,
SEMREP TYPE STRING,
MANREP TYPE STRING,
DONE TYPE STRING,
FINDAT TYPE STRING,
REF_ABRDATS TYPE STRING,
MISSBO TYPE STRING,
ALIENPRO TYPE STRING,
BELNR TYPE STRING,
EXPGRP TYPE STRING,
EXPNAME TYPE STRING,
EXTNUMBER TYPE STRING,
TIMESTAMPA TYPE STRING,
TIMESTAMPR TYPE STRING,
RUNID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_INSTSET_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_INSTSET_STR-MANDT sy-vline 
WA_INSTSET_STR-SETNO sy-vline 
WA_INSTSET_STR-MSGID sy-vline 
WA_INSTSET_STR-MSGNO sy-vline 
WA_INSTSET_STR-ANLAGE sy-vline 
WA_INSTSET_STR-MSGV1 sy-vline 
WA_INSTSET_STR-MSGV2 sy-vline 
WA_INSTSET_STR-MSGV3 sy-vline 
WA_INSTSET_STR-MSGV4 sy-vline 
WA_INSTSET_STR-EROEDAT sy-vline 
WA_INSTSET_STR-ABRDATS sy-vline 
WA_INSTSET_STR-ABRVORG sy-vline 
WA_INSTSET_STR-ERRORCT sy-vline 
WA_INSTSET_STR-AEDAT sy-vline 
WA_INSTSET_STR-AENAM sy-vline 
WA_INSTSET_STR-MAN_WORK sy-vline 
WA_INSTSET_STR-AUTREP sy-vline 
WA_INSTSET_STR-SEMREL sy-vline 
WA_INSTSET_STR-SEMREP sy-vline 
WA_INSTSET_STR-MANREP sy-vline 
WA_INSTSET_STR-DONE sy-vline 
WA_INSTSET_STR-FINDAT sy-vline 
WA_INSTSET_STR-REF_ABRDATS sy-vline 
WA_INSTSET_STR-MISSBO sy-vline 
WA_INSTSET_STR-ALIENPRO sy-vline 
WA_INSTSET_STR-BELNR sy-vline 
WA_INSTSET_STR-EXPGRP sy-vline 
WA_INSTSET_STR-EXPNAME sy-vline 
WA_INSTSET_STR-EXTNUMBER sy-vline 
WA_INSTSET_STR-TIMESTAMPA sy-vline 
WA_INSTSET_STR-TIMESTAMPR sy-vline 
WA_INSTSET_STR-RUNID sy-vline      INTO ld_text SEPARATED BY SPACE.

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