ABAP Select data from SAP table IALLOCATIONTABLE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IALLOCATIONTABLE
*  INTO TABLE @DATA(IT_IALLOCATIONTABLE2).
*--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_IALLOCATIONTABLE INDEX 1 INTO DATA(WA_IALLOCATIONTABLE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IALLOCATIONTABLE>-MANDT = 1.
<IALLOCATIONTABLE>-ALLOCATIONTABLE = 1.
<IALLOCATIONTABLE>-ALLOCATIONTABLEDESCRIPTION = 1.
<IALLOCATIONTABLE>-ALLOCATIONTABLETYPE = 1.
<IALLOCATIONTABLE>-PURCHASINGORGANIZATION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IALLOCATIONTABLE-PURCHASINGGROUP, sy-vline,
  WA_IALLOCATIONTABLE-ALLOCTABLEACTIVITYSTATUS, sy-vline,
  WA_IALLOCATIONTABLE-MAINTENANCESTATUS, sy-vline,
  WA_IALLOCATIONTABLE-ALLOCTABLECREATINGAPPLICATION, sy-vline,
  WA_IALLOCATIONTABLE-CREATIONDATE, sy-vline,
  WA_IALLOCATIONTABLE-CREATEDBYUSER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IALLOCATIONTABLE 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_IALLOCATIONTABLE 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_IALLOCATIONTABLE INTO WA_IALLOCATIONTABLE.


*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 ALLOCATIONTABLE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IALLOCATIONTABLE-ALLOCATIONTABLE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IALLOCATIONTABLE-ALLOCATIONTABLE.
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_IALLOCATIONTABLE_STR, 
MANDT TYPE STRING,
ALLOCATIONTABLE TYPE STRING,
ALLOCATIONTABLEDESCRIPTION TYPE STRING,
ALLOCATIONTABLETYPE TYPE STRING,
PURCHASINGORGANIZATION TYPE STRING,
PURCHASINGGROUP TYPE STRING,
ALLOCTABLEACTIVITYSTATUS TYPE STRING,
MAINTENANCESTATUS TYPE STRING,
ALLOCTABLECREATINGAPPLICATION TYPE STRING,
CREATIONDATE TYPE STRING,
CREATEDBYUSER TYPE STRING,
LASTCHANGEDATE TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IALLOCATIONTABLE_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_IALLOCATIONTABLE_STR-MANDT sy-vline 
WA_IALLOCATIONTABLE_STR-ALLOCATIONTABLE sy-vline 
WA_IALLOCATIONTABLE_STR-ALLOCATIONTABLEDESCRIPTION sy-vline 
WA_IALLOCATIONTABLE_STR-ALLOCATIONTABLETYPE sy-vline 
WA_IALLOCATIONTABLE_STR-PURCHASINGORGANIZATION sy-vline 
WA_IALLOCATIONTABLE_STR-PURCHASINGGROUP sy-vline 
WA_IALLOCATIONTABLE_STR-ALLOCTABLEACTIVITYSTATUS sy-vline 
WA_IALLOCATIONTABLE_STR-MAINTENANCESTATUS sy-vline 
WA_IALLOCATIONTABLE_STR-ALLOCTABLECREATINGAPPLICATION sy-vline 
WA_IALLOCATIONTABLE_STR-CREATIONDATE sy-vline 
WA_IALLOCATIONTABLE_STR-CREATEDBYUSER sy-vline 
WA_IALLOCATIONTABLE_STR-LASTCHANGEDATE sy-vline 
WA_IALLOCATIONTABLE_STR-LASTCHANGEDBYUSER sy-vline      INTO ld_text SEPARATED BY SPACE.

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