ABAP Select data from SAP table OMATTBUFFER_LOG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OMATTBUFFER_LOG
*  INTO TABLE @DATA(IT_OMATTBUFFER_LOG2).
*--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_OMATTBUFFER_LOG INDEX 1 INTO DATA(WA_OMATTBUFFER_LOG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OMATTBUFFER_LOG>-FROMREL = 1.
<OMATTBUFFER_LOG>-TOREL = 1.
<OMATTBUFFER_LOG>-REPID = 1.
<OMATTBUFFER_LOG>-BUFDAT = 1.
<OMATTBUFFER_LOG>-UNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OMATTBUFFER_LOG-SCENARIO, sy-vline,
  WA_OMATTBUFFER_LOG-ACTION, sy-vline,
  WA_OMATTBUFFER_LOG-MANDT, sy-vline,
  WA_OMATTBUFFER_LOG-SAPREL, sy-vline,
  WA_OMATTBUFFER_LOG-DATUM, sy-vline,
  WA_OMATTBUFFER_LOG-TIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OMATTBUFFER_LOG 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_OMATTBUFFER_LOG 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_OMATTBUFFER_LOG INTO WA_OMATTBUFFER_LOG.


*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_OMATTBUFFER_LOG_STR, 
FROMREL TYPE STRING,
TOREL TYPE STRING,
REPID TYPE STRING,
BUFDAT TYPE STRING,
UNAME TYPE STRING,
SCENARIO TYPE STRING,
ACTION TYPE STRING,
MANDT TYPE STRING,
SAPREL TYPE STRING,
DATUM TYPE STRING,
TIME TYPE STRING,
OK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OMATTBUFFER_LOG_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_OMATTBUFFER_LOG_STR-FROMREL sy-vline 
WA_OMATTBUFFER_LOG_STR-TOREL sy-vline 
WA_OMATTBUFFER_LOG_STR-REPID sy-vline 
WA_OMATTBUFFER_LOG_STR-BUFDAT sy-vline 
WA_OMATTBUFFER_LOG_STR-UNAME sy-vline 
WA_OMATTBUFFER_LOG_STR-SCENARIO sy-vline 
WA_OMATTBUFFER_LOG_STR-ACTION sy-vline 
WA_OMATTBUFFER_LOG_STR-MANDT sy-vline 
WA_OMATTBUFFER_LOG_STR-SAPREL sy-vline 
WA_OMATTBUFFER_LOG_STR-DATUM sy-vline 
WA_OMATTBUFFER_LOG_STR-TIME sy-vline 
WA_OMATTBUFFER_LOG_STR-OK sy-vline      INTO ld_text SEPARATED BY SPACE.

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