ABAP Select data from SAP table /CPD/PWS_WSS_OBJ_FIELD_CATALOG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /CPD/PWS_WSS_OBJ_FIELD_CATALOG 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 /CPD/PWS_WSS_OBJ_FIELD_CATALOG. 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 /CPD/PWS_WSS_OBJ_FIELD_CATALOG 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_/CPD/PWS_WSS_OBJ_FIELD_CATALOG TYPE STANDARD TABLE OF /CPD/PWS_WSS_OBJ_FIELD_CATALOG,
      WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG TYPE /CPD/PWS_WSS_OBJ_FIELD_CATALOG,
      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: </CPD/PWS_WSS_OBJ_FIELD_CATALOG> TYPE /CPD/PWS_WSS_OBJ_FIELD_CATALOG.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /CPD/PWS_WSS_OBJ_FIELD_CATALOG
  INTO TABLE IT_/CPD/PWS_WSS_OBJ_FIELD_CATALOG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /CPD/PWS_WSS_OBJ_FIELD_CATALOG
*  INTO TABLE @DATA(IT_/CPD/PWS_WSS_OBJ_FIELD_CATALOG2).
*--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_/CPD/PWS_WSS_OBJ_FIELD_CATALOG INDEX 1 INTO DATA(WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/CPD/PWS_WSS_OBJ_FIELD_CATALOG ASSIGNING </CPD/PWS_WSS_OBJ_FIELD_CATALOG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</CPD/PWS_WSS_OBJ_FIELD_CATALOG>-OBJECT_LINK = 1.
</CPD/PWS_WSS_OBJ_FIELD_CATALOG>-TABNAME = 1.
</CPD/PWS_WSS_OBJ_FIELD_CATALOG>-FIELDNAME = 1.
</CPD/PWS_WSS_OBJ_FIELD_CATALOG>-DDLANGUAGE = 1.
</CPD/PWS_WSS_OBJ_FIELD_CATALOG>-POSITION = 1.

ENDLOOP.

LOOP AT IT_/CPD/PWS_WSS_OBJ_FIELD_CATALOG INTO WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-KEYFLAG, sy-vline,
  WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-MANDATORY, sy-vline,
  WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-ROLLNAME, sy-vline,
  WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-CHECKTABLE, sy-vline,
  WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-ADMINFIELD, sy-vline,
  WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-INTTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG 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_/CPD/PWS_WSS_OBJ_FIELD_CATALOG 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_/CPD/PWS_WSS_OBJ_FIELD_CATALOG INTO WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG.


*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 ISOLA, internal->external for field DDLANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-DDLANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-DDLANGUAGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field DTELMASTER
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-DTELMASTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-DTELMASTER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-DATATYPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field DOMMASTER
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-DOMMASTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG-DOMMASTER.
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_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR, 
OBJECT_LINK TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
DDLANGUAGE TYPE STRING,
POSITION TYPE STRING,
KEYFLAG TYPE STRING,
MANDATORY TYPE STRING,
ROLLNAME TYPE STRING,
CHECKTABLE TYPE STRING,
ADMINFIELD TYPE STRING,
INTTYPE TYPE STRING,
INTLEN TYPE STRING,
REFTABLE TYPE STRING,
PRECFIELD TYPE STRING,
REFFIELD TYPE STRING,
CONROUT TYPE STRING,
NOTNULL TYPE STRING,
DOMNAME TYPE STRING,
ROUTPUTLEN TYPE STRING,
MEMORYID TYPE STRING,
LOGFLAG TYPE STRING,
HEADLEN TYPE STRING,
SCRLEN1 TYPE STRING,
SCRLEN2 TYPE STRING,
SCRLEN3 TYPE STRING,
DTELGLOBAL TYPE STRING,
DTELMASTER TYPE STRING,
RESERVEDTE TYPE STRING,
DATATYPE TYPE STRING,
LENG TYPE STRING,
OUTPUTLEN TYPE STRING,
DECIMALS TYPE STRING,
LOWERCASE TYPE STRING,
SIGNFLAG TYPE STRING,
LANGFLAG TYPE STRING,
VALEXI TYPE STRING,
ENTITYTAB TYPE STRING,
CONVEXIT TYPE STRING,
MASK TYPE STRING,
MASKLEN TYPE STRING,
ACTFLAG TYPE STRING,
DDTEXT TYPE STRING,
REPTEXT TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
DOMMASTER TYPE STRING,
RESERVEDOM TYPE STRING,
DOMGLOBAL TYPE STRING,
DOMNAME3L TYPE STRING,
SHLPORIGIN TYPE STRING,
SHLPNAME TYPE STRING,
SHLPFIELD TYPE STRING,
TABLETYPE TYPE STRING,
DEPTH TYPE STRING,
COMPTYPE TYPE STRING,
DEFFDNAME TYPE STRING,
GROUPNAME TYPE STRING,
REFTYPE TYPE STRING,
PROXYTYPE TYPE STRING,
LANGUFLAG TYPE STRING,
EXCLASS TYPE STRING,
LTRFLDDIS TYPE STRING,
BIDICTRLC TYPE STRING,
DBPOSITION TYPE STRING,
ANONYMOUS TYPE STRING,
OUTPUTSTYLE TYPE STRING,
NOHISTORY TYPE STRING,
AMPMFORMAT TYPE STRING,
STREAMORLOC TYPE STRING,
STRORLOCPOS TYPE STRING,
SQL_PASSVALUE TYPE STRING,
IS_VIRTUAL TYPE STRING,
IS_CALCULATED TYPE STRING,
EXTENDNAME TYPE STRING,
SRS_ID TYPE STRING,
HASH_NAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_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_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-OBJECT_LINK sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-TABNAME sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-FIELDNAME sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DDLANGUAGE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-POSITION sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-KEYFLAG sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-MANDATORY sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-ROLLNAME sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-CHECKTABLE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-ADMINFIELD sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-INTTYPE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-INTLEN sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-REFTABLE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-PRECFIELD sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-REFFIELD sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-CONROUT sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-NOTNULL sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DOMNAME sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-ROUTPUTLEN sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-MEMORYID sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-LOGFLAG sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-HEADLEN sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SCRLEN1 sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SCRLEN2 sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SCRLEN3 sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DTELGLOBAL sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DTELMASTER sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-RESERVEDTE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DATATYPE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-LENG sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-OUTPUTLEN sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DECIMALS sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-LOWERCASE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SIGNFLAG sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-LANGFLAG sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-VALEXI sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-ENTITYTAB sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-CONVEXIT sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-MASK sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-MASKLEN sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-ACTFLAG sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DDTEXT sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-REPTEXT sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SCRTEXT_S sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SCRTEXT_M sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SCRTEXT_L sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DOMMASTER sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-RESERVEDOM sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DOMGLOBAL sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DOMNAME3L sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SHLPORIGIN sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SHLPNAME sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SHLPFIELD sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-TABLETYPE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DEPTH sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-COMPTYPE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DEFFDNAME sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-GROUPNAME sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-REFTYPE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-PROXYTYPE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-LANGUFLAG sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-EXCLASS sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-LTRFLDDIS sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-BIDICTRLC sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-DBPOSITION sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-ANONYMOUS sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-OUTPUTSTYLE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-NOHISTORY sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-AMPMFORMAT sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-STREAMORLOC sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-STRORLOCPOS sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SQL_PASSVALUE sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-IS_VIRTUAL sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-IS_CALCULATED sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-EXTENDNAME sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-SRS_ID sy-vline 
WA_/CPD/PWS_WSS_OBJ_FIELD_CATALOG_STR-HASH_NAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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