ABAP Select data from SAP table ICA_ASSIGN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICA_ASSIGN
*  INTO TABLE @DATA(IT_ICA_ASSIGN2).
*--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_ICA_ASSIGN INDEX 1 INTO DATA(WA_ICA_ASSIGN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICA_ASSIGN>-RCLNT = 1.
<ICA_ASSIGN>-GRREF = 1.
<ICA_ASSIGN>-METHOD_ID = 1.
<ICA_ASSIGN>-RULE_ID = 1.
<ICA_ASSIGN>-RCODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICA_ASSIGN-WF_SCENARIO_ID, sy-vline,
  WA_ICA_ASSIGN-UNASSIGNED, sy-vline,
  WA_ICA_ASSIGN-COMMENT_CNT, sy-vline,
  WA_ICA_ASSIGN-PERIV, sy-vline,
  WA_ICA_ASSIGN-RYEAR, sy-vline,
  WA_ICA_ASSIGN-POPER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICA_ASSIGN 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_ICA_ASSIGN 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_ICA_ASSIGN INTO WA_ICA_ASSIGN.


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

*Conversion exit PERI7, internal->external for field FISCYEARPER
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_ICA_ASSIGN-FISCYEARPER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICA_ASSIGN-FISCYEARPER.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field RVERS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ICA_ASSIGN-RVERS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICA_ASSIGN-RVERS.
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_ICA_ASSIGN_STR, 
RCLNT TYPE STRING,
GRREF TYPE STRING,
METHOD_ID TYPE STRING,
RULE_ID TYPE STRING,
RCODE TYPE STRING,
WF_SCENARIO_ID TYPE STRING,
UNASSIGNED TYPE STRING,
COMMENT_CNT TYPE STRING,
PERIV TYPE STRING,
RYEAR TYPE STRING,
POPER TYPE STRING,
FISCYEARPER TYPE STRING,
RLDNR TYPE STRING,
RVERS TYPE STRING,
RITCLG TYPE STRING,
CREATEDBY TYPE STRING,
CREATEDAT TYPE STRING,
CHANGEDBY TYPE STRING,
CHANGEDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICA_ASSIGN_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_ICA_ASSIGN_STR-RCLNT sy-vline 
WA_ICA_ASSIGN_STR-GRREF sy-vline 
WA_ICA_ASSIGN_STR-METHOD_ID sy-vline 
WA_ICA_ASSIGN_STR-RULE_ID sy-vline 
WA_ICA_ASSIGN_STR-RCODE sy-vline 
WA_ICA_ASSIGN_STR-WF_SCENARIO_ID sy-vline 
WA_ICA_ASSIGN_STR-UNASSIGNED sy-vline 
WA_ICA_ASSIGN_STR-COMMENT_CNT sy-vline 
WA_ICA_ASSIGN_STR-PERIV sy-vline 
WA_ICA_ASSIGN_STR-RYEAR sy-vline 
WA_ICA_ASSIGN_STR-POPER sy-vline 
WA_ICA_ASSIGN_STR-FISCYEARPER sy-vline 
WA_ICA_ASSIGN_STR-RLDNR sy-vline 
WA_ICA_ASSIGN_STR-RVERS sy-vline 
WA_ICA_ASSIGN_STR-RITCLG sy-vline 
WA_ICA_ASSIGN_STR-CREATEDBY sy-vline 
WA_ICA_ASSIGN_STR-CREATEDAT sy-vline 
WA_ICA_ASSIGN_STR-CHANGEDBY sy-vline 
WA_ICA_ASSIGN_STR-CHANGEDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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