ABAP Select data from SAP table DCMASS4LOG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DCMASS4LOG 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 DCMASS4LOG. 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 DCMASS4LOG 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_DCMASS4LOG TYPE STANDARD TABLE OF DCMASS4LOG,
      WA_DCMASS4LOG TYPE DCMASS4LOG,
      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: <DCMASS4LOG> TYPE DCMASS4LOG.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DCMASS4LOG.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DCMASS4LOG
  INTO TABLE IT_DCMASS4LOG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DCMASS4LOG
*  INTO TABLE @DATA(IT_DCMASS4LOG2).
*--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_DCMASS4LOG INDEX 1 INTO DATA(WA_DCMASS4LOG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DCMASS4LOG ASSIGNING <DCMASS4LOG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DCMASS4LOG>-LOGNAME = 1.
<DCMASS4LOG>-UUID = 1.
<DCMASS4LOG>-CDATE = 1.
<DCMASS4LOG>-CTIME = 1.
<DCMASS4LOG>-DURATION = 1.

ENDLOOP.

LOOP AT IT_DCMASS4LOG INTO WA_DCMASS4LOG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DCMASS4LOG-CUSER, sy-vline,
  WA_DCMASS4LOG-DELFLAG, sy-vline,
  WA_DCMASS4LOG-DDMODE, sy-vline,
  WA_DCMASS4LOG-INACTIVE, sy-vline,
  WA_DCMASS4LOG-RC, sy-vline,
  WA_DCMASS4LOG-SERVER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DCMASS4LOG 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_DCMASS4LOG 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_DCMASS4LOG INTO WA_DCMASS4LOG.


*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_DCMASS4LOG_STR, 
LOGNAME TYPE STRING,
UUID TYPE STRING,
CDATE TYPE STRING,
CTIME TYPE STRING,
DURATION TYPE STRING,
CUSER TYPE STRING,
DELFLAG TYPE STRING,
DDMODE TYPE STRING,
INACTIVE TYPE STRING,
RC TYPE STRING,
SERVER TYPE STRING,
PID TYPE STRING,
WPNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DCMASS4LOG_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_DCMASS4LOG_STR-LOGNAME sy-vline 
WA_DCMASS4LOG_STR-UUID sy-vline 
WA_DCMASS4LOG_STR-CDATE sy-vline 
WA_DCMASS4LOG_STR-CTIME sy-vline 
WA_DCMASS4LOG_STR-DURATION sy-vline 
WA_DCMASS4LOG_STR-CUSER sy-vline 
WA_DCMASS4LOG_STR-DELFLAG sy-vline 
WA_DCMASS4LOG_STR-DDMODE sy-vline 
WA_DCMASS4LOG_STR-INACTIVE sy-vline 
WA_DCMASS4LOG_STR-RC sy-vline 
WA_DCMASS4LOG_STR-SERVER sy-vline 
WA_DCMASS4LOG_STR-PID sy-vline 
WA_DCMASS4LOG_STR-WPNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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