ABAP Select data from SAP table ENHMETH_HEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ENHMETH_HEADER
*  INTO TABLE @DATA(IT_ENHMETH_HEADER2).
*--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_ENHMETH_HEADER INDEX 1 INTO DATA(WA_ENHMETH_HEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ENHMETH_HEADER>-CLSNAME = 1.
<ENHMETH_HEADER>-CMPNAME = 1.
<ENHMETH_HEADER>-VERSION = 1.
<ENHMETH_HEADER>-LANGU = 1.
<ENHMETH_HEADER>-DESCRIPT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ENHMETH_HEADER-ALIAS, sy-vline,
  WA_ENHMETH_HEADER-REDEFIN, sy-vline,
  WA_ENHMETH_HEADER-EXPOSURE, sy-vline,
  WA_ENHMETH_HEADER-STATE, sy-vline,
  WA_ENHMETH_HEADER-EDITORDER, sy-vline,
  WA_ENHMETH_HEADER-DISPID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ENHMETH_HEADER 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_ENHMETH_HEADER 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_ENHMETH_HEADER INTO WA_ENHMETH_HEADER.


*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_ENHMETH_HEADER-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ENHMETH_HEADER-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_ENHMETH_HEADER_STR, 
CLSNAME TYPE STRING,
CMPNAME TYPE STRING,
VERSION TYPE STRING,
LANGU TYPE STRING,
DESCRIPT TYPE STRING,
ALIAS TYPE STRING,
REDEFIN TYPE STRING,
EXPOSURE TYPE STRING,
STATE TYPE STRING,
EDITORDER TYPE STRING,
DISPID TYPE STRING,
AUTHOR TYPE STRING,
CREATEDON TYPE STRING,
CHANGEDBY TYPE STRING,
CHANGEDON TYPE STRING,
MTDTYPE TYPE STRING,
MTDDECLTYP TYPE STRING,
MTDABSTRCT TYPE STRING,
MTDFINAL TYPE STRING,
REFCLSNAME TYPE STRING,
REFINTNAME TYPE STRING,
REFCMPNAME TYPE STRING,
DSRNOTEOM TYPE STRING,
MTDNEWEXC TYPE STRING,
LOCKED TYPE STRING,
R3RELEASE TYPE STRING,
BCMTDINST TYPE STRING,
BCMTDCAT TYPE STRING,
BCMTDDIA TYPE STRING,
BCMTDCOM TYPE STRING,
BCMTDSYN TYPE STRING,
MTDREPLACE TYPE STRING,
MTDOPTNL TYPE STRING,
MTDAMDPRDONLY TYPE STRING,
MTDAMDPCDSCLNT TYPE STRING,
ENHANCEMENT TYPE STRING,
DESCRIPT_ID TYPE STRING,
DOCU_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ENHMETH_HEADER_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_ENHMETH_HEADER_STR-CLSNAME sy-vline 
WA_ENHMETH_HEADER_STR-CMPNAME sy-vline 
WA_ENHMETH_HEADER_STR-VERSION sy-vline 
WA_ENHMETH_HEADER_STR-LANGU sy-vline 
WA_ENHMETH_HEADER_STR-DESCRIPT sy-vline 
WA_ENHMETH_HEADER_STR-ALIAS sy-vline 
WA_ENHMETH_HEADER_STR-REDEFIN sy-vline 
WA_ENHMETH_HEADER_STR-EXPOSURE sy-vline 
WA_ENHMETH_HEADER_STR-STATE sy-vline 
WA_ENHMETH_HEADER_STR-EDITORDER sy-vline 
WA_ENHMETH_HEADER_STR-DISPID sy-vline 
WA_ENHMETH_HEADER_STR-AUTHOR sy-vline 
WA_ENHMETH_HEADER_STR-CREATEDON sy-vline 
WA_ENHMETH_HEADER_STR-CHANGEDBY sy-vline 
WA_ENHMETH_HEADER_STR-CHANGEDON sy-vline 
WA_ENHMETH_HEADER_STR-MTDTYPE sy-vline 
WA_ENHMETH_HEADER_STR-MTDDECLTYP sy-vline 
WA_ENHMETH_HEADER_STR-MTDABSTRCT sy-vline 
WA_ENHMETH_HEADER_STR-MTDFINAL sy-vline 
WA_ENHMETH_HEADER_STR-REFCLSNAME sy-vline 
WA_ENHMETH_HEADER_STR-REFINTNAME sy-vline 
WA_ENHMETH_HEADER_STR-REFCMPNAME sy-vline 
WA_ENHMETH_HEADER_STR-DSRNOTEOM sy-vline 
WA_ENHMETH_HEADER_STR-MTDNEWEXC sy-vline 
WA_ENHMETH_HEADER_STR-LOCKED sy-vline 
WA_ENHMETH_HEADER_STR-R3RELEASE sy-vline 
WA_ENHMETH_HEADER_STR-BCMTDINST sy-vline 
WA_ENHMETH_HEADER_STR-BCMTDCAT sy-vline 
WA_ENHMETH_HEADER_STR-BCMTDDIA sy-vline 
WA_ENHMETH_HEADER_STR-BCMTDCOM sy-vline 
WA_ENHMETH_HEADER_STR-BCMTDSYN sy-vline 
WA_ENHMETH_HEADER_STR-MTDREPLACE sy-vline 
WA_ENHMETH_HEADER_STR-MTDOPTNL sy-vline 
WA_ENHMETH_HEADER_STR-MTDAMDPRDONLY sy-vline 
WA_ENHMETH_HEADER_STR-MTDAMDPCDSCLNT sy-vline 
WA_ENHMETH_HEADER_STR-ENHANCEMENT sy-vline 
WA_ENHMETH_HEADER_STR-DESCRIPT_ID sy-vline 
WA_ENHMETH_HEADER_STR-DOCU_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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