ABAP Select data from SAP table DBA_DBH_COLL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DBA_DBH_COLL
*  INTO TABLE @DATA(IT_DBA_DBH_COLL2).
*--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_DBA_DBH_COLL INDEX 1 INTO DATA(WA_DBA_DBH_COLL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DBA_DBH_COLL>-COLLECTOR_ID = 1.
<DBA_DBH_COLL>-SYSTEM_PRIO = 1.
<DBA_DBH_COLL>-DBSYS = 1.
<DBA_DBH_COLL>-COLLECTOR_CLASS = 1.
<DBA_DBH_COLL>-COLLECTOR_LEVEL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DBA_DBH_COLL-DBNAME, sy-vline,
  WA_DBA_DBH_COLL-DBCNAME, sy-vline,
  WA_DBA_DBH_COLL-ACTIVE, sy-vline,
  WA_DBA_DBH_COLL-COMMAND, sy-vline,
  WA_DBA_DBH_COLL-DLT_RUN, sy-vline,
  WA_DBA_DBH_COLL-LAST_RUN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DBA_DBH_COLL 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_DBA_DBH_COLL 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_DBA_DBH_COLL INTO WA_DBA_DBH_COLL.


*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_DBA_DBH_COLL_STR, 
COLLECTOR_ID TYPE STRING,
SYSTEM_PRIO TYPE STRING,
DBSYS TYPE STRING,
COLLECTOR_CLASS TYPE STRING,
COLLECTOR_LEVEL TYPE STRING,
DBNAME TYPE STRING,
DBCNAME TYPE STRING,
ACTIVE TYPE STRING,
COMMAND TYPE STRING,
DLT_RUN TYPE STRING,
LAST_RUN TYPE STRING,
RUNTIME TYPE STRING,
CRON_SCHEDULE TYPE STRING,
FIRST_RUN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DBA_DBH_COLL_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_DBA_DBH_COLL_STR-COLLECTOR_ID sy-vline 
WA_DBA_DBH_COLL_STR-SYSTEM_PRIO sy-vline 
WA_DBA_DBH_COLL_STR-DBSYS sy-vline 
WA_DBA_DBH_COLL_STR-COLLECTOR_CLASS sy-vline 
WA_DBA_DBH_COLL_STR-COLLECTOR_LEVEL sy-vline 
WA_DBA_DBH_COLL_STR-DBNAME sy-vline 
WA_DBA_DBH_COLL_STR-DBCNAME sy-vline 
WA_DBA_DBH_COLL_STR-ACTIVE sy-vline 
WA_DBA_DBH_COLL_STR-COMMAND sy-vline 
WA_DBA_DBH_COLL_STR-DLT_RUN sy-vline 
WA_DBA_DBH_COLL_STR-LAST_RUN sy-vline 
WA_DBA_DBH_COLL_STR-RUNTIME sy-vline 
WA_DBA_DBH_COLL_STR-CRON_SCHEDULE sy-vline 
WA_DBA_DBH_COLL_STR-FIRST_RUN sy-vline      INTO ld_text SEPARATED BY SPACE.

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