ABAP Select data from SAP table CPEC_CONVERSION_MIGR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CPEC_CONVERSION_MIGR
*  INTO TABLE @DATA(IT_CPEC_CONVERSION_MIGR2).
*--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_CPEC_CONVERSION_MIGR INDEX 1 INTO DATA(WA_CPEC_CONVERSION_MIGR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CPEC_CONVERSION_MIGR>-CLIENT = 1.
<CPEC_CONVERSION_MIGR>-LOGSYS = 1.
<CPEC_CONVERSION_MIGR>-RECORDNAME = 1.
<CPEC_CONVERSION_MIGR>-CONVERSIONRULE = 1.
<CPEC_CONVERSION_MIGR>-VALIDTO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CPEC_CONVERSION_MIGR-CONVERSIONROUT, sy-vline,
  WA_CPEC_CONVERSION_MIGR-EXCHRATETYPE, sy-vline,
  WA_CPEC_CONVERSION_MIGR-EXCHRATEAVG, sy-vline,
  WA_CPEC_CONVERSION_MIGR-CONVROUND, sy-vline,
  WA_CPEC_CONVERSION_MIGR-QUANCONVRULE, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_CPEC_CONVERSION_MIGR 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_CPEC_CONVERSION_MIGR 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_CPEC_CONVERSION_MIGR INTO WA_CPEC_CONVERSION_MIGR.


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

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

*Conversion exit TSTPS, internal->external for field VALIDTO
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_CPEC_CONVERSION_MIGR-VALIDTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CPEC_CONVERSION_MIGR-VALIDTO.
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_CPEC_CONVERSION_MIGR_STR, 
CLIENT TYPE STRING,
LOGSYS TYPE STRING,
RECORDNAME TYPE STRING,
CONVERSIONRULE TYPE STRING,
VALIDTO TYPE STRING,
CONVERSIONROUT TYPE STRING,
EXCHRATETYPE TYPE STRING,
EXCHRATEAVG TYPE STRING,
CONVROUND TYPE STRING,
QUANCONVRULE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CPEC_CONVERSION_MIGR_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_CPEC_CONVERSION_MIGR_STR-CLIENT sy-vline 
WA_CPEC_CONVERSION_MIGR_STR-LOGSYS sy-vline 
WA_CPEC_CONVERSION_MIGR_STR-RECORDNAME sy-vline 
WA_CPEC_CONVERSION_MIGR_STR-CONVERSIONRULE sy-vline 
WA_CPEC_CONVERSION_MIGR_STR-VALIDTO sy-vline 
WA_CPEC_CONVERSION_MIGR_STR-CONVERSIONROUT sy-vline 
WA_CPEC_CONVERSION_MIGR_STR-EXCHRATETYPE sy-vline 
WA_CPEC_CONVERSION_MIGR_STR-EXCHRATEAVG sy-vline 
WA_CPEC_CONVERSION_MIGR_STR-CONVROUND sy-vline 
WA_CPEC_CONVERSION_MIGR_STR-QUANCONVRULE sy-vline      INTO ld_text SEPARATED BY SPACE.

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