ABAP Select data from SAP table CSAP_S_COMPARE_FIELDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CSAP_S_COMPARE_FIELDS
*  INTO TABLE @DATA(IT_CSAP_S_COMPARE_FIELDS2).
*--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_CSAP_S_COMPARE_FIELDS INDEX 1 INTO DATA(WA_CSAP_S_COMPARE_FIELDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CSAP_S_COMPARE_FIELDS>-BILLOFMATERIALCOMPONENT = 1.
<CSAP_S_COMPARE_FIELDS>-ENGINEERINGCHNAGEDOCUMENT = 1.
<CSAP_S_COMPARE_FIELDS>-MATERIALTYPE = 1.
<CSAP_S_COMPARE_FIELDS>-ITEMQUANTITY = 1.
<CSAP_S_COMPARE_FIELDS>-BOMITEMCATEGORY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CSAP_S_COMPARE_FIELDS-ITEMDESCRIPTION, sy-vline,
  WA_CSAP_S_COMPARE_FIELDS-BOMITEMNUMBER, sy-vline,
  WA_CSAP_S_COMPARE_FIELDS-COMPLETEMAINTSTATUS, sy-vline,
  WA_CSAP_S_COMPARE_FIELDS-BOMHEADERBASEUNIT, sy-vline,
  WA_CSAP_S_COMPARE_FIELDS-BILLOFMATERIALITEMUNIT, sy-vline,
  WA_CSAP_S_COMPARE_FIELDS-ISPRODUCTIONRELEVANT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CSAP_S_COMPARE_FIELDS 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_CSAP_S_COMPARE_FIELDS 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_CSAP_S_COMPARE_FIELDS INTO WA_CSAP_S_COMPARE_FIELDS.


*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 MATN1, internal->external for field BILLOFMATERIALCOMPONENT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_CSAP_S_COMPARE_FIELDS-BILLOFMATERIALCOMPONENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CSAP_S_COMPARE_FIELDS-BILLOFMATERIALCOMPONENT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit NUMCV, internal->external for field BOMITEMNUMBER
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_CSAP_S_COMPARE_FIELDS-BOMITEMNUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CSAP_S_COMPARE_FIELDS-BOMITEMNUMBER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BOMHEADERBASEUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CSAP_S_COMPARE_FIELDS-BOMHEADERBASEUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CSAP_S_COMPARE_FIELDS-BOMHEADERBASEUNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BILLOFMATERIALITEMUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CSAP_S_COMPARE_FIELDS-BILLOFMATERIALITEMUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CSAP_S_COMPARE_FIELDS-BILLOFMATERIALITEMUNIT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field MATERIALBASEUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CSAP_S_COMPARE_FIELDS-MATERIALBASEUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CSAP_S_COMPARE_FIELDS-MATERIALBASEUNIT.
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_CSAP_S_COMPARE_FIELDS_STR, 
BILLOFMATERIALCOMPONENT TYPE STRING,
ENGINEERINGCHNAGEDOCUMENT TYPE STRING,
MATERIALTYPE TYPE STRING,
ITEMQUANTITY TYPE STRING,
BOMITEMCATEGORY TYPE STRING,
ITEMDESCRIPTION TYPE STRING,
BOMITEMNUMBER TYPE STRING,
COMPLETEMAINTSTATUS TYPE STRING,
BOMHEADERBASEUNIT TYPE STRING,
BILLOFMATERIALITEMUNIT TYPE STRING,
ISPRODUCTIONRELEVANT TYPE STRING,
BOMITEMISCOSTINGRELEVANT TYPE STRING,
ISHEADERDELETE TYPE STRING,
SPECIALPROCUREMENTTYPE TYPE STRING,
MATERIALISCONFIGURABLE TYPE STRING,
ISMATERIALPROVISION TYPE STRING,
ISCAD TYPE STRING,
LEADTIMEOFFSET TYPE STRING,
PURCHASINGGROUP TYPE STRING,
DELIVERYDURATIONINDAYS TYPE STRING,
SUPPLIER TYPE STRING,
ITEMPRICE TYPE STRING,
PRICEUNIT TYPE STRING,
NUMBEROFVARIABLESIZEITEM TYPE STRING,
SIZE1 TYPE STRING,
SIZE2 TYPE STRING,
SIZE3 TYPE STRING,
QUANTITYVARIABLESIZEITEM TYPE STRING,
FORMULAKEY TYPE STRING,
GOODSRECEIPTDURATION TYPE STRING,
MATERIALGROUP TYPE STRING,
ITEMQUANTITYINBASEUNIT TYPE STRING,
MATERIALBASEUNIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CSAP_S_COMPARE_FIELDS_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_CSAP_S_COMPARE_FIELDS_STR-BILLOFMATERIALCOMPONENT sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-ENGINEERINGCHNAGEDOCUMENT sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-MATERIALTYPE sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-ITEMQUANTITY sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-BOMITEMCATEGORY sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-ITEMDESCRIPTION sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-BOMITEMNUMBER sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-COMPLETEMAINTSTATUS sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-BOMHEADERBASEUNIT sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-BILLOFMATERIALITEMUNIT sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-ISPRODUCTIONRELEVANT sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-BOMITEMISCOSTINGRELEVANT sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-ISHEADERDELETE sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-SPECIALPROCUREMENTTYPE sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-MATERIALISCONFIGURABLE sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-ISMATERIALPROVISION sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-ISCAD sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-LEADTIMEOFFSET sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-PURCHASINGGROUP sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-DELIVERYDURATIONINDAYS sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-SUPPLIER sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-ITEMPRICE sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-PRICEUNIT sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-NUMBEROFVARIABLESIZEITEM sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-SIZE1 sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-SIZE2 sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-SIZE3 sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-QUANTITYVARIABLESIZEITEM sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-FORMULAKEY sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-GOODSRECEIPTDURATION sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-MATERIALGROUP sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-ITEMQUANTITYINBASEUNIT sy-vline 
WA_CSAP_S_COMPARE_FIELDS_STR-MATERIALBASEUNIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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