ABAP Select data from SAP table CMMUNUSEDPC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CMMUNUSEDPC
*  INTO TABLE @DATA(IT_CMMUNUSEDPC2).
*--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_CMMUNUSEDPC INDEX 1 INTO DATA(WA_CMMUNUSEDPC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CMMUNUSEDPC>-MANDT = 1.
<CMMUNUSEDPC>-PURCHASECONTRACT = 1.
<CMMUNUSEDPC>-CREATEDBYUSER = 1.
<CMMUNUSEDPC>-PURCHASECONTRACTTYPE = 1.
<CMMUNUSEDPC>-SUPPLIER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CMMUNUSEDPC-SUPPLIERNAME, sy-vline,
  WA_CMMUNUSEDPC-PURCHASINGORGANIZATION, sy-vline,
  WA_CMMUNUSEDPC-PURCHASINGORGANIZATIONNAME, sy-vline,
  WA_CMMUNUSEDPC-PURCHASINGGROUP, sy-vline,
  WA_CMMUNUSEDPC-PURCHASINGGROUPNAME, sy-vline,
  WA_CMMUNUSEDPC-COMPANYCODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CMMUNUSEDPC 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_CMMUNUSEDPC 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_CMMUNUSEDPC INTO WA_CMMUNUSEDPC.


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

*Conversion exit ALPHA, internal->external for field SUPPLIER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMMUNUSEDPC-SUPPLIER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMMUNUSEDPC-SUPPLIER.
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_CMMUNUSEDPC_STR, 
MANDT TYPE STRING,
PURCHASECONTRACT TYPE STRING,
CREATEDBYUSER TYPE STRING,
PURCHASECONTRACTTYPE TYPE STRING,
SUPPLIER TYPE STRING,
SUPPLIERNAME TYPE STRING,
PURCHASINGORGANIZATION TYPE STRING,
PURCHASINGORGANIZATIONNAME TYPE STRING,
PURCHASINGGROUP TYPE STRING,
PURCHASINGGROUPNAME TYPE STRING,
COMPANYCODE TYPE STRING,
COMPANYCODENAME TYPE STRING,
PURCHASINGDOCUMENTCATEGORY TYPE STRING,
PURCHASINGDOCUMENTCATEGORYNAME TYPE STRING,
CREATIONDATE TYPE STRING,
CALENDARDATE TYPE STRING,
CALENDARYEAR TYPE STRING,
CALENDARMONTH TYPE STRING,
CALENDARQUARTER TYPE STRING,
CALENDARWEEK TYPE STRING,
DISPLAYCURRENCY TYPE STRING,
NUMBEROFCONTRACTS TYPE STRING,
RELEASEORDERITEMNETAMOUNT TYPE STRING,
PURCHASECONTRACTTARGETAMOUNT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CMMUNUSEDPC_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_CMMUNUSEDPC_STR-MANDT sy-vline 
WA_CMMUNUSEDPC_STR-PURCHASECONTRACT sy-vline 
WA_CMMUNUSEDPC_STR-CREATEDBYUSER sy-vline 
WA_CMMUNUSEDPC_STR-PURCHASECONTRACTTYPE sy-vline 
WA_CMMUNUSEDPC_STR-SUPPLIER sy-vline 
WA_CMMUNUSEDPC_STR-SUPPLIERNAME sy-vline 
WA_CMMUNUSEDPC_STR-PURCHASINGORGANIZATION sy-vline 
WA_CMMUNUSEDPC_STR-PURCHASINGORGANIZATIONNAME sy-vline 
WA_CMMUNUSEDPC_STR-PURCHASINGGROUP sy-vline 
WA_CMMUNUSEDPC_STR-PURCHASINGGROUPNAME sy-vline 
WA_CMMUNUSEDPC_STR-COMPANYCODE sy-vline 
WA_CMMUNUSEDPC_STR-COMPANYCODENAME sy-vline 
WA_CMMUNUSEDPC_STR-PURCHASINGDOCUMENTCATEGORY sy-vline 
WA_CMMUNUSEDPC_STR-PURCHASINGDOCUMENTCATEGORYNAME sy-vline 
WA_CMMUNUSEDPC_STR-CREATIONDATE sy-vline 
WA_CMMUNUSEDPC_STR-CALENDARDATE sy-vline 
WA_CMMUNUSEDPC_STR-CALENDARYEAR sy-vline 
WA_CMMUNUSEDPC_STR-CALENDARMONTH sy-vline 
WA_CMMUNUSEDPC_STR-CALENDARQUARTER sy-vline 
WA_CMMUNUSEDPC_STR-CALENDARWEEK sy-vline 
WA_CMMUNUSEDPC_STR-DISPLAYCURRENCY sy-vline 
WA_CMMUNUSEDPC_STR-NUMBEROFCONTRACTS sy-vline 
WA_CMMUNUSEDPC_STR-RELEASEORDERITEMNETAMOUNT sy-vline 
WA_CMMUNUSEDPC_STR-PURCHASECONTRACTTARGETAMOUNT sy-vline      INTO ld_text SEPARATED BY SPACE.

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