ABAP Select data from SAP table /DSD/VC_MESSAGES 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 /DSD/VC_MESSAGES 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 /DSD/VC_MESSAGES. 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 /DSD/VC_MESSAGES 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_/DSD/VC_MESSAGES TYPE STANDARD TABLE OF /DSD/VC_MESSAGES,
      WA_/DSD/VC_MESSAGES TYPE /DSD/VC_MESSAGES,
      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: </DSD/VC_MESSAGES> TYPE /DSD/VC_MESSAGES.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /DSD/VC_MESSAGES
*  INTO TABLE @DATA(IT_/DSD/VC_MESSAGES2).
*--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_/DSD/VC_MESSAGES INDEX 1 INTO DATA(WA_/DSD/VC_MESSAGES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</DSD/VC_MESSAGES>-OBJECT = 1.
</DSD/VC_MESSAGES>-SUBOBJECT = 1.
</DSD/VC_MESSAGES>-EXTNUMBER = 1.
</DSD/VC_MESSAGES>-ALDATE = 1.
</DSD/VC_MESSAGES>-ALTIME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/DSD/VC_MESSAGES-ALUSER, sy-vline,
  WA_/DSD/VC_MESSAGES-ALTCODE, sy-vline,
  WA_/DSD/VC_MESSAGES-ALPROG, sy-vline,
  WA_/DSD/VC_MESSAGES-ALMODE, sy-vline,
  WA_/DSD/VC_MESSAGES-MSGTY, sy-vline,
  WA_/DSD/VC_MESSAGES-MSGID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/DSD/VC_MESSAGES 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_/DSD/VC_MESSAGES 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_/DSD/VC_MESSAGES INTO WA_/DSD/VC_MESSAGES.


*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_/DSD/VC_MESSAGES_STR, 
OBJECT TYPE STRING,
SUBOBJECT TYPE STRING,
EXTNUMBER TYPE STRING,
ALDATE TYPE STRING,
ALTIME TYPE STRING,
ALUSER TYPE STRING,
ALTCODE TYPE STRING,
ALPROG TYPE STRING,
ALMODE TYPE STRING,
MSGTY TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
MSGV1_SRC TYPE STRING,
MSGV2_SRC TYPE STRING,
MSGV3_SRC TYPE STRING,
MSGV4_SRC TYPE STRING,
DETLEVEL TYPE STRING,
PROBCLASS TYPE STRING,
ALSORT TYPE STRING,
TIME_STMP TYPE STRING,
MSG_COUNT TYPE STRING,
CONTEXT TYPE STRING,
TABNAME TYPE STRING,
VALUE TYPE STRING,
PARAMS TYPE STRING,
T_PAR TYPE STRING,
CALLBACK TYPE STRING,
USEREXITP TYPE STRING,
USEREXITF TYPE STRING,
USEREXITT TYPE STRING,
ALTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/DSD/VC_MESSAGES_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_/DSD/VC_MESSAGES_STR-OBJECT sy-vline 
WA_/DSD/VC_MESSAGES_STR-SUBOBJECT sy-vline 
WA_/DSD/VC_MESSAGES_STR-EXTNUMBER sy-vline 
WA_/DSD/VC_MESSAGES_STR-ALDATE sy-vline 
WA_/DSD/VC_MESSAGES_STR-ALTIME sy-vline 
WA_/DSD/VC_MESSAGES_STR-ALUSER sy-vline 
WA_/DSD/VC_MESSAGES_STR-ALTCODE sy-vline 
WA_/DSD/VC_MESSAGES_STR-ALPROG sy-vline 
WA_/DSD/VC_MESSAGES_STR-ALMODE sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSGTY sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSGID sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSGNO sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSGV1 sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSGV2 sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSGV3 sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSGV4 sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSGV1_SRC sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSGV2_SRC sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSGV3_SRC sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSGV4_SRC sy-vline 
WA_/DSD/VC_MESSAGES_STR-DETLEVEL sy-vline 
WA_/DSD/VC_MESSAGES_STR-PROBCLASS sy-vline 
WA_/DSD/VC_MESSAGES_STR-ALSORT sy-vline 
WA_/DSD/VC_MESSAGES_STR-TIME_STMP sy-vline 
WA_/DSD/VC_MESSAGES_STR-MSG_COUNT sy-vline 
WA_/DSD/VC_MESSAGES_STR-CONTEXT sy-vline 
WA_/DSD/VC_MESSAGES_STR-TABNAME sy-vline 
WA_/DSD/VC_MESSAGES_STR-VALUE sy-vline 
WA_/DSD/VC_MESSAGES_STR-PARAMS sy-vline 
WA_/DSD/VC_MESSAGES_STR-T_PAR sy-vline 
WA_/DSD/VC_MESSAGES_STR-CALLBACK sy-vline 
WA_/DSD/VC_MESSAGES_STR-USEREXITP sy-vline 
WA_/DSD/VC_MESSAGES_STR-USEREXITF sy-vline 
WA_/DSD/VC_MESSAGES_STR-USEREXITT sy-vline 
WA_/DSD/VC_MESSAGES_STR-ALTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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