ABAP Select data from SAP table CNV_PE_MC_COMP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_PE_MC_COMP
*  INTO TABLE @DATA(IT_CNV_PE_MC_COMP2).
*--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_CNV_PE_MC_COMP INDEX 1 INTO DATA(WA_CNV_PE_MC_COMP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_PE_MC_COMP>-CLIENT = 1.
<CNV_PE_MC_COMP>-PROJECTUUID = 1.
<CNV_PE_MC_COMP>-DESCRIPTION = 1.
<CNV_PE_MC_COMP>-MIGRATIONAPPROACH = 1.
<CNV_PE_MC_COMP>-SCENARIO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_PE_MC_COMP-CREATEDBY, sy-vline,
  WA_CNV_PE_MC_COMP-CREATEDON, sy-vline,
  WA_CNV_PE_MC_COMP-TOBEDELETED, sy-vline,
  WA_CNV_PE_MC_COMP-FINISHED, sy-vline,
  WA_CNV_PE_MC_COMP-IMPORTED, sy-vline,
  WA_CNV_PE_MC_COMP-DESTINATION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_PE_MC_COMP 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_CNV_PE_MC_COMP 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_CNV_PE_MC_COMP INTO WA_CNV_PE_MC_COMP.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_CNV_PE_MC_COMP_STR, 
CLIENT TYPE STRING,
PROJECTUUID TYPE STRING,
DESCRIPTION TYPE STRING,
MIGRATIONAPPROACH TYPE STRING,
SCENARIO TYPE STRING,
CREATEDBY TYPE STRING,
CREATEDON TYPE STRING,
TOBEDELETED TYPE STRING,
FINISHED TYPE STRING,
IMPORTED TYPE STRING,
DESTINATION TYPE STRING,
AREAID TYPE STRING,
EVENTTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_PE_MC_COMP_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_CNV_PE_MC_COMP_STR-CLIENT sy-vline 
WA_CNV_PE_MC_COMP_STR-PROJECTUUID sy-vline 
WA_CNV_PE_MC_COMP_STR-DESCRIPTION sy-vline 
WA_CNV_PE_MC_COMP_STR-MIGRATIONAPPROACH sy-vline 
WA_CNV_PE_MC_COMP_STR-SCENARIO sy-vline 
WA_CNV_PE_MC_COMP_STR-CREATEDBY sy-vline 
WA_CNV_PE_MC_COMP_STR-CREATEDON sy-vline 
WA_CNV_PE_MC_COMP_STR-TOBEDELETED sy-vline 
WA_CNV_PE_MC_COMP_STR-FINISHED sy-vline 
WA_CNV_PE_MC_COMP_STR-IMPORTED sy-vline 
WA_CNV_PE_MC_COMP_STR-DESTINATION sy-vline 
WA_CNV_PE_MC_COMP_STR-AREAID sy-vline 
WA_CNV_PE_MC_COMP_STR-EVENTTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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