ABAP Select data from SAP table DB6_TRANSACTION_LOG_DISP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB6_TRANSACTION_LOG_DISP 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 DB6_TRANSACTION_LOG_DISP. 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 DB6_TRANSACTION_LOG_DISP 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_DB6_TRANSACTION_LOG_DISP TYPE STANDARD TABLE OF DB6_TRANSACTION_LOG_DISP,
      WA_DB6_TRANSACTION_LOG_DISP TYPE DB6_TRANSACTION_LOG_DISP,
      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: <DB6_TRANSACTION_LOG_DISP> TYPE DB6_TRANSACTION_LOG_DISP.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB6_TRANSACTION_LOG_DISP.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB6_TRANSACTION_LOG_DISP
  INTO TABLE IT_DB6_TRANSACTION_LOG_DISP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB6_TRANSACTION_LOG_DISP
*  INTO TABLE @DATA(IT_DB6_TRANSACTION_LOG_DISP2).
*--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_DB6_TRANSACTION_LOG_DISP INDEX 1 INTO DATA(WA_DB6_TRANSACTION_LOG_DISP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB6_TRANSACTION_LOG_DISP ASSIGNING <DB6_TRANSACTION_LOG_DISP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB6_TRANSACTION_LOG_DISP>-MEMBER = 1.
<DB6_TRANSACTION_LOG_DISP>-LOG_READS = 1.
<DB6_TRANSACTION_LOG_DISP>-LOG_READ_TIME = 1.
<DB6_TRANSACTION_LOG_DISP>-LOG_WRITES = 1.
<DB6_TRANSACTION_LOG_DISP>-LOG_WRITE_TIME = 1.

ENDLOOP.

LOOP AT IT_DB6_TRANSACTION_LOG_DISP INTO WA_DB6_TRANSACTION_LOG_DISP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB6_TRANSACTION_LOG_DISP-LOG_HADR_WAIT_TIME, sy-vline,
  WA_DB6_TRANSACTION_LOG_DISP-LOG_HADR_WAITS_TOTAL, sy-vline,
  WA_DB6_TRANSACTION_LOG_DISP-AVG_LOG_READ_TIME, sy-vline,
  WA_DB6_TRANSACTION_LOG_DISP-AVG_LOG_WRITE_TIME, sy-vline,
  WA_DB6_TRANSACTION_LOG_DISP-AVG_LOG_HADR_WAIT_TIME, sy-vline,
  WA_DB6_TRANSACTION_LOG_DISP-TOTAL_LOG_AVAILABLE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB6_TRANSACTION_LOG_DISP 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_DB6_TRANSACTION_LOG_DISP 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_DB6_TRANSACTION_LOG_DISP INTO WA_DB6_TRANSACTION_LOG_DISP.


*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_DB6_TRANSACTION_LOG_DISP_STR, 
MEMBER TYPE STRING,
LOG_READS TYPE STRING,
LOG_READ_TIME TYPE STRING,
LOG_WRITES TYPE STRING,
LOG_WRITE_TIME TYPE STRING,
LOG_HADR_WAIT_TIME TYPE STRING,
LOG_HADR_WAITS_TOTAL TYPE STRING,
AVG_LOG_READ_TIME TYPE STRING,
AVG_LOG_WRITE_TIME TYPE STRING,
AVG_LOG_HADR_WAIT_TIME TYPE STRING,
TOTAL_LOG_AVAILABLE TYPE STRING,
TOTAL_LOG_USED TYPE STRING,
AVG_TOTAL_LOG_USED_PCT TYPE STRING,
AVG_TOTAL_LOG_USED TYPE STRING,
SEC_LOG_USED_TOP TYPE STRING,
TOT_LOG_USED_TOP_PCT TYPE STRING,
TOT_LOG_USED_TOP TYPE STRING,
SEC_LOGS_ALLOCATED TYPE STRING,
NUM_LOG_WRITE_IO TYPE STRING,
NUM_LOG_READ_IO TYPE STRING,
NUM_LOG_PART_PAGE_IO TYPE STRING,
NUM_LOG_BUFFER_FULL TYPE STRING,
NUM_LOG_DATA_FOUND_IN_BUFFER TYPE STRING,
LOG_TO_REDO_FOR_RECOVERY TYPE STRING,
LOG_HELD_BY_DIRTY_PAGES TYPE STRING,
NUM_INDOUBT_TRANS TYPE STRING,
LOG_VOLUME_DLT_KB TYPE STRING,
AVG_LOG_VOLUME_DLT_KB_PER_MIN TYPE STRING,
LOG_EXTR_DISK_SP_USED_TOT_TOP TYPE STRING,
LOG_EXTRACTION_STATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB6_TRANSACTION_LOG_DISP_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_DB6_TRANSACTION_LOG_DISP_STR-MEMBER sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-LOG_READS sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-LOG_READ_TIME sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-LOG_WRITES sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-LOG_WRITE_TIME sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-LOG_HADR_WAIT_TIME sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-LOG_HADR_WAITS_TOTAL sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-AVG_LOG_READ_TIME sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-AVG_LOG_WRITE_TIME sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-AVG_LOG_HADR_WAIT_TIME sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-TOTAL_LOG_AVAILABLE sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-TOTAL_LOG_USED sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-AVG_TOTAL_LOG_USED_PCT sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-AVG_TOTAL_LOG_USED sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-SEC_LOG_USED_TOP sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-TOT_LOG_USED_TOP_PCT sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-TOT_LOG_USED_TOP sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-SEC_LOGS_ALLOCATED sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-NUM_LOG_WRITE_IO sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-NUM_LOG_READ_IO sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-NUM_LOG_PART_PAGE_IO sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-NUM_LOG_BUFFER_FULL sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-NUM_LOG_DATA_FOUND_IN_BUFFER sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-LOG_TO_REDO_FOR_RECOVERY sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-LOG_HELD_BY_DIRTY_PAGES sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-NUM_INDOUBT_TRANS sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-LOG_VOLUME_DLT_KB sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-AVG_LOG_VOLUME_DLT_KB_PER_MIN sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-LOG_EXTR_DISK_SP_USED_TOT_TOP sy-vline 
WA_DB6_TRANSACTION_LOG_DISP_STR-LOG_EXTRACTION_STATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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