ABAP Select data from SAP table /IWFND/L_MET_COL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /IWFND/L_MET_COL
*  INTO TABLE @DATA(IT_/IWFND/L_MET_COL2).
*--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_/IWFND/L_MET_COL INDEX 1 INTO DATA(WA_/IWFND/L_MET_COL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</IWFND/L_MET_COL>-MANDT = 1.
</IWFND/L_MET_COL>-ID = 1.
</IWFND/L_MET_COL>-CONSUMER_TYPE = 1.
</IWFND/L_MET_COL>-GSDO_TYPE = 1.
</IWFND/L_MET_COL>-TECH_SRV_NAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/IWFND/L_MET_COL-TECH_SRV_VERSION, sy-vline,
  WA_/IWFND/L_MET_COL-OPERATION, sy-vline,
  WA_/IWFND/L_MET_COL-NUM_ENTRIES, sy-vline,
  WA_/IWFND/L_MET_COL-ENTITY_TYPE, sy-vline,
  WA_/IWFND/L_MET_COL-ENTITY_DEPTH, sy-vline,
  WA_/IWFND/L_MET_COL-ACCESS_TYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/IWFND/L_MET_COL 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_/IWFND/L_MET_COL 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_/IWFND/L_MET_COL INTO WA_/IWFND/L_MET_COL.


*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_/IWFND/L_MET_COL_STR, 
MANDT TYPE STRING,
ID TYPE STRING,
CONSUMER_TYPE TYPE STRING,
GSDO_TYPE TYPE STRING,
TECH_SRV_NAME TYPE STRING,
TECH_SRV_VERSION TYPE STRING,
OPERATION TYPE STRING,
NUM_ENTRIES TYPE STRING,
ENTITY_TYPE TYPE STRING,
ENTITY_DEPTH TYPE STRING,
ACCESS_TYPE TYPE STRING,
FORMAT_TYPE TYPE STRING,
XML_SIZE TYPE STRING,
DELIVERY_ADDRESS TYPE STRING,
REQUEST_ADDRESS TYPE STRING,
USERID TYPE STRING,
TIMESTAMP TYPE STRING,
ODC_USED TYPE STRING,
AGGREGATED TYPE STRING,
DURATION TYPE STRING,
NAMESPACE TYPE STRING,
GWTOTAL TYPE STRING,
GWHUB TYPE STRING,
GWRFCOH TYPE STRING,
GWBE TYPE STRING,
GWAPP TYPE STRING,
GWBEWAIT TYPE STRING,
GWAPPSUM TYPE STRING,
REQUEST_SIZE TYPE STRING,
TIMESTAMPL TYPE STRING,
MAIN_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/IWFND/L_MET_COL_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_/IWFND/L_MET_COL_STR-MANDT sy-vline 
WA_/IWFND/L_MET_COL_STR-ID sy-vline 
WA_/IWFND/L_MET_COL_STR-CONSUMER_TYPE sy-vline 
WA_/IWFND/L_MET_COL_STR-GSDO_TYPE sy-vline 
WA_/IWFND/L_MET_COL_STR-TECH_SRV_NAME sy-vline 
WA_/IWFND/L_MET_COL_STR-TECH_SRV_VERSION sy-vline 
WA_/IWFND/L_MET_COL_STR-OPERATION sy-vline 
WA_/IWFND/L_MET_COL_STR-NUM_ENTRIES sy-vline 
WA_/IWFND/L_MET_COL_STR-ENTITY_TYPE sy-vline 
WA_/IWFND/L_MET_COL_STR-ENTITY_DEPTH sy-vline 
WA_/IWFND/L_MET_COL_STR-ACCESS_TYPE sy-vline 
WA_/IWFND/L_MET_COL_STR-FORMAT_TYPE sy-vline 
WA_/IWFND/L_MET_COL_STR-XML_SIZE sy-vline 
WA_/IWFND/L_MET_COL_STR-DELIVERY_ADDRESS sy-vline 
WA_/IWFND/L_MET_COL_STR-REQUEST_ADDRESS sy-vline 
WA_/IWFND/L_MET_COL_STR-USERID sy-vline 
WA_/IWFND/L_MET_COL_STR-TIMESTAMP sy-vline 
WA_/IWFND/L_MET_COL_STR-ODC_USED sy-vline 
WA_/IWFND/L_MET_COL_STR-AGGREGATED sy-vline 
WA_/IWFND/L_MET_COL_STR-DURATION sy-vline 
WA_/IWFND/L_MET_COL_STR-NAMESPACE sy-vline 
WA_/IWFND/L_MET_COL_STR-GWTOTAL sy-vline 
WA_/IWFND/L_MET_COL_STR-GWHUB sy-vline 
WA_/IWFND/L_MET_COL_STR-GWRFCOH sy-vline 
WA_/IWFND/L_MET_COL_STR-GWBE sy-vline 
WA_/IWFND/L_MET_COL_STR-GWAPP sy-vline 
WA_/IWFND/L_MET_COL_STR-GWBEWAIT sy-vline 
WA_/IWFND/L_MET_COL_STR-GWAPPSUM sy-vline 
WA_/IWFND/L_MET_COL_STR-REQUEST_SIZE sy-vline 
WA_/IWFND/L_MET_COL_STR-TIMESTAMPL sy-vline 
WA_/IWFND/L_MET_COL_STR-MAIN_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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