ABAP Select data from SAP table DMC_STREE_TRACE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMC_STREE_TRACE
*  INTO TABLE @DATA(IT_DMC_STREE_TRACE2).
*--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_DMC_STREE_TRACE INDEX 1 INTO DATA(WA_DMC_STREE_TRACE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMC_STREE_TRACE>-TRACE_GUID = 1.
<DMC_STREE_TRACE>-MODIFIED = 1.
<DMC_STREE_TRACE>-TRACE_TMSTMP = 1.
<DMC_STREE_TRACE>-GUID = 1.
<DMC_STREE_TRACE>-CONTAINER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMC_STREE_TRACE-STYPE, sy-vline,
  WA_DMC_STREE_TRACE-SEQNUM, sy-vline,
  WA_DMC_STREE_TRACE-IDENT, sy-vline,
  WA_DMC_STREE_TRACE-STRUCT, sy-vline,
  WA_DMC_STREE_TRACE-FILEDESC, sy-vline,
  WA_DMC_STREE_TRACE-PREC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMC_STREE_TRACE 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_DMC_STREE_TRACE 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_DMC_STREE_TRACE INTO WA_DMC_STREE_TRACE.


*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_DMC_STREE_TRACE_STR, 
TRACE_GUID TYPE STRING,
MODIFIED TYPE STRING,
TRACE_TMSTMP TYPE STRING,
GUID TYPE STRING,
CONTAINER TYPE STRING,
STYPE TYPE STRING,
SEQNUM TYPE STRING,
IDENT TYPE STRING,
STRUCT TYPE STRING,
FILEDESC TYPE STRING,
PREC TYPE STRING,
VERSIO TYPE STRING,
CHNAM TYPE STRING,
STRUCLEVEL TYPE STRING,
PARENTID TYPE STRING,
CHANGEDATE TYPE STRING,
AUTHOR TYPE STRING,
CREATEDATE TYPE STRING,
DESCR TYPE STRING,
REFNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMC_STREE_TRACE_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_DMC_STREE_TRACE_STR-TRACE_GUID sy-vline 
WA_DMC_STREE_TRACE_STR-MODIFIED sy-vline 
WA_DMC_STREE_TRACE_STR-TRACE_TMSTMP sy-vline 
WA_DMC_STREE_TRACE_STR-GUID sy-vline 
WA_DMC_STREE_TRACE_STR-CONTAINER sy-vline 
WA_DMC_STREE_TRACE_STR-STYPE sy-vline 
WA_DMC_STREE_TRACE_STR-SEQNUM sy-vline 
WA_DMC_STREE_TRACE_STR-IDENT sy-vline 
WA_DMC_STREE_TRACE_STR-STRUCT sy-vline 
WA_DMC_STREE_TRACE_STR-FILEDESC sy-vline 
WA_DMC_STREE_TRACE_STR-PREC sy-vline 
WA_DMC_STREE_TRACE_STR-VERSIO sy-vline 
WA_DMC_STREE_TRACE_STR-CHNAM sy-vline 
WA_DMC_STREE_TRACE_STR-STRUCLEVEL sy-vline 
WA_DMC_STREE_TRACE_STR-PARENTID sy-vline 
WA_DMC_STREE_TRACE_STR-CHANGEDATE sy-vline 
WA_DMC_STREE_TRACE_STR-AUTHOR sy-vline 
WA_DMC_STREE_TRACE_STR-CREATEDATE sy-vline 
WA_DMC_STREE_TRACE_STR-DESCR sy-vline 
WA_DMC_STREE_TRACE_STR-REFNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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