ABAP Select data from SAP table ENH_CWB_INTF_CLAS_METH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ENH_CWB_INTF_CLAS_METH
*  INTO TABLE @DATA(IT_ENH_CWB_INTF_CLAS_METH2).
*--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_ENH_CWB_INTF_CLAS_METH INDEX 1 INTO DATA(WA_ENH_CWB_INTF_CLAS_METH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ENH_CWB_INTF_CLAS_METH>-VRSFLAG = 1.
<ENH_CWB_INTF_CLAS_METH>-METHNAME = 1.
<ENH_CWB_INTF_CLAS_METH>-CLSNAME = 1.
<ENH_CWB_INTF_CLAS_METH>-CMPNAME = 1.
<ENH_CWB_INTF_CLAS_METH>-SCONAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ENH_CWB_INTF_CLAS_METH-VERSION, sy-vline,
  WA_ENH_CWB_INTF_CLAS_METH-LANGU, sy-vline,
  WA_ENH_CWB_INTF_CLAS_METH-DESCRIPT, sy-vline,
  WA_ENH_CWB_INTF_CLAS_METH-MTDTYPE, sy-vline,
  WA_ENH_CWB_INTF_CLAS_METH-EDITORDER, sy-vline,
  WA_ENH_CWB_INTF_CLAS_METH-AUTHOR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ENH_CWB_INTF_CLAS_METH 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_ENH_CWB_INTF_CLAS_METH 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_ENH_CWB_INTF_CLAS_METH INTO WA_ENH_CWB_INTF_CLAS_METH.


*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 LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_ENH_CWB_INTF_CLAS_METH-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ENH_CWB_INTF_CLAS_METH-LANGU.
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_ENH_CWB_INTF_CLAS_METH_STR, 
VRSFLAG TYPE STRING,
METHNAME TYPE STRING,
CLSNAME TYPE STRING,
CMPNAME TYPE STRING,
SCONAME TYPE STRING,
VERSION TYPE STRING,
LANGU TYPE STRING,
DESCRIPT TYPE STRING,
MTDTYPE TYPE STRING,
EDITORDER TYPE STRING,
AUTHOR TYPE STRING,
CREATEDON TYPE STRING,
CHANGEDBY TYPE STRING,
CHANGEDON TYPE STRING,
PARDECLTYP TYPE STRING,
PARPASSTYP TYPE STRING,
TYPTYPE TYPE STRING,
TYPE TYPE STRING,
TABLEOF TYPE STRING,
PARVALUE TYPE STRING,
PAROPTIONL TYPE STRING,
PARPREFERD TYPE STRING,
LOCKED TYPE STRING,
ENHANCEMENT TYPE STRING,
DESCRIPT_ID TYPE STRING,
DOCU_ID TYPE STRING,
RELATED_ENHANCEMENT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ENH_CWB_INTF_CLAS_METH_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_ENH_CWB_INTF_CLAS_METH_STR-VRSFLAG sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-METHNAME sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-CLSNAME sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-CMPNAME sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-SCONAME sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-VERSION sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-LANGU sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-DESCRIPT sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-MTDTYPE sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-EDITORDER sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-AUTHOR sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-CREATEDON sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-CHANGEDBY sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-CHANGEDON sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-PARDECLTYP sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-PARPASSTYP sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-TYPTYPE sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-TYPE sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-TABLEOF sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-PARVALUE sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-PAROPTIONL sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-PARPREFERD sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-LOCKED sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-ENHANCEMENT sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-DESCRIPT_ID sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-DOCU_ID sy-vline 
WA_ENH_CWB_INTF_CLAS_METH_STR-RELATED_ENHANCEMENT sy-vline      INTO ld_text SEPARATED BY SPACE.

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