ABAP Select data from SAP table SDB_VOLLOG_TREE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SDB_VOLLOG_TREE
*  INTO TABLE @DATA(IT_SDB_VOLLOG_TREE2).
*--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_SDB_VOLLOG_TREE INDEX 1 INTO DATA(WA_SDB_VOLLOG_TREE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SDB_VOLLOG_TREE>-NODE_KEY = 1.
<SDB_VOLLOG_TREE>-PARENT_KEY = 1.
<SDB_VOLLOG_TREE>-NODE_TEXT = 1.
<SDB_VOLLOG_TREE>-EXPANDED = 1.
<SDB_VOLLOG_TREE>-ISLEAF = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SDB_VOLLOG_TREE-VISIBLE, sy-vline,
  WA_SDB_VOLLOG_TREE-WDB_CELLDESIGN, sy-vline,
  WA_SDB_VOLLOG_TREE-WDB_SEMANTIC_COLOR, sy-vline,
  WA_SDB_VOLLOG_TREE-GUI_N_IMAGE, sy-vline,
  WA_SDB_VOLLOG_TREE-GUI_EXP_IMAGE, sy-vline,
  WA_SDB_VOLLOG_TREE-GUI_REAL_NODE_KEY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SDB_VOLLOG_TREE 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_SDB_VOLLOG_TREE 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_SDB_VOLLOG_TREE INTO WA_SDB_VOLLOG_TREE.


*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_SDB_VOLLOG_TREE_STR, 
NODE_KEY TYPE STRING,
PARENT_KEY TYPE STRING,
NODE_TEXT TYPE STRING,
EXPANDED TYPE STRING,
ISLEAF TYPE STRING,
VISIBLE TYPE STRING,
WDB_CELLDESIGN TYPE STRING,
WDB_SEMANTIC_COLOR TYPE STRING,
GUI_N_IMAGE TYPE STRING,
GUI_EXP_IMAGE TYPE STRING,
GUI_REAL_NODE_KEY TYPE STRING,
GUI_REAL_PARENT_KEY TYPE STRING,
GUI_STYLE TYPE STRING,
GUI_ITEM_LAYOUT TYPE STRING,
ID TYPE STRING,
VOLTYPE TYPE STRING,
INT_NAME TYPE STRING,
SIZE_KB TYPE STRING,
IS_MIRROR TYPE STRING,
DELETEABLE TYPE STRING,
DEV_TYPE TYPE STRING,
DEVICE TYPE STRING,
READCNT TYPE STRING,
READPGCNT TYPE STRING,
WRITECNT TYPE STRING,
WRITEPGCNT TYPE STRING,
DISPLAY_SIZE TYPE STRING,
DISPLAY_SCALE TYPE STRING,
LOG_PARTITION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SDB_VOLLOG_TREE_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_SDB_VOLLOG_TREE_STR-NODE_KEY sy-vline 
WA_SDB_VOLLOG_TREE_STR-PARENT_KEY sy-vline 
WA_SDB_VOLLOG_TREE_STR-NODE_TEXT sy-vline 
WA_SDB_VOLLOG_TREE_STR-EXPANDED sy-vline 
WA_SDB_VOLLOG_TREE_STR-ISLEAF sy-vline 
WA_SDB_VOLLOG_TREE_STR-VISIBLE sy-vline 
WA_SDB_VOLLOG_TREE_STR-WDB_CELLDESIGN sy-vline 
WA_SDB_VOLLOG_TREE_STR-WDB_SEMANTIC_COLOR sy-vline 
WA_SDB_VOLLOG_TREE_STR-GUI_N_IMAGE sy-vline 
WA_SDB_VOLLOG_TREE_STR-GUI_EXP_IMAGE sy-vline 
WA_SDB_VOLLOG_TREE_STR-GUI_REAL_NODE_KEY sy-vline 
WA_SDB_VOLLOG_TREE_STR-GUI_REAL_PARENT_KEY sy-vline 
WA_SDB_VOLLOG_TREE_STR-GUI_STYLE sy-vline 
WA_SDB_VOLLOG_TREE_STR-GUI_ITEM_LAYOUT sy-vline 
WA_SDB_VOLLOG_TREE_STR-ID sy-vline 
WA_SDB_VOLLOG_TREE_STR-VOLTYPE sy-vline 
WA_SDB_VOLLOG_TREE_STR-INT_NAME sy-vline 
WA_SDB_VOLLOG_TREE_STR-SIZE_KB sy-vline 
WA_SDB_VOLLOG_TREE_STR-IS_MIRROR sy-vline 
WA_SDB_VOLLOG_TREE_STR-DELETEABLE sy-vline 
WA_SDB_VOLLOG_TREE_STR-DEV_TYPE sy-vline 
WA_SDB_VOLLOG_TREE_STR-DEVICE sy-vline 
WA_SDB_VOLLOG_TREE_STR-READCNT sy-vline 
WA_SDB_VOLLOG_TREE_STR-READPGCNT sy-vline 
WA_SDB_VOLLOG_TREE_STR-WRITECNT sy-vline 
WA_SDB_VOLLOG_TREE_STR-WRITEPGCNT sy-vline 
WA_SDB_VOLLOG_TREE_STR-DISPLAY_SIZE sy-vline 
WA_SDB_VOLLOG_TREE_STR-DISPLAY_SCALE sy-vline 
WA_SDB_VOLLOG_TREE_STR-LOG_PARTITION sy-vline      INTO ld_text SEPARATED BY SPACE.

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