ABAP Select data from SAP table VIRT_CONFIG into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VIRT_CONFIG
*  INTO TABLE @DATA(IT_VIRT_CONFIG2).
*--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_VIRT_CONFIG INDEX 1 INTO DATA(WA_VIRT_CONFIG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VIRT_CONFIG>-TYPE = 1.
<VIRT_CONFIG>-SUBTYPE = 1.
<VIRT_CONFIG>-SERIALNR = 1.
<VIRT_CONFIG>-VIRTMETHOD = 1.
<VIRT_CONFIG>-VIRTPRODUCTINFO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VIRT_CONFIG-HOSTSYSTEMINFO, sy-vline,
  WA_VIRT_CONFIG-RESOURCEMEMORYRESERVATION, sy-vline,
  WA_VIRT_CONFIG-RESOURCEMEMORYLIMIT, sy-vline,
  WA_VIRT_CONFIG-RESOURCEPROCESSORRESERVATION, sy-vline,
  WA_VIRT_CONFIG-RESOURCEPROCESSORLIMIT, sy-vline,
  WA_VIRT_CONFIG-DISKSTATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VIRT_CONFIG 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_VIRT_CONFIG 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_VIRT_CONFIG INTO WA_VIRT_CONFIG.


*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_VIRT_CONFIG_STR, 
TYPE TYPE STRING,
SUBTYPE TYPE STRING,
SERIALNR TYPE STRING,
VIRTMETHOD TYPE STRING,
VIRTPRODUCTINFO TYPE STRING,
HOSTSYSTEMINFO TYPE STRING,
RESOURCEMEMORYRESERVATION TYPE STRING,
RESOURCEMEMORYLIMIT TYPE STRING,
RESOURCEPROCESSORRESERVATION TYPE STRING,
RESOURCEPROCESSORLIMIT TYPE STRING,
DISKSTATUS TYPE STRING,
LANSTATUS TYPE STRING,
RESERVE_RAW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VIRT_CONFIG_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_VIRT_CONFIG_STR-TYPE sy-vline 
WA_VIRT_CONFIG_STR-SUBTYPE sy-vline 
WA_VIRT_CONFIG_STR-SERIALNR sy-vline 
WA_VIRT_CONFIG_STR-VIRTMETHOD sy-vline 
WA_VIRT_CONFIG_STR-VIRTPRODUCTINFO sy-vline 
WA_VIRT_CONFIG_STR-HOSTSYSTEMINFO sy-vline 
WA_VIRT_CONFIG_STR-RESOURCEMEMORYRESERVATION sy-vline 
WA_VIRT_CONFIG_STR-RESOURCEMEMORYLIMIT sy-vline 
WA_VIRT_CONFIG_STR-RESOURCEPROCESSORRESERVATION sy-vline 
WA_VIRT_CONFIG_STR-RESOURCEPROCESSORLIMIT sy-vline 
WA_VIRT_CONFIG_STR-DISKSTATUS sy-vline 
WA_VIRT_CONFIG_STR-LANSTATUS sy-vline 
WA_VIRT_CONFIG_STR-RESERVE_RAW sy-vline      INTO ld_text SEPARATED BY SPACE.

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