ABAP Select data from SAP table GVD_BUFF_POOL_ST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GVD_BUFF_POOL_ST
*  INTO TABLE @DATA(IT_GVD_BUFF_POOL_ST2).
*--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_GVD_BUFF_POOL_ST INDEX 1 INTO DATA(WA_GVD_BUFF_POOL_ST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GVD_BUFF_POOL_ST>-SNAPSHOT_ID = 1.
<GVD_BUFF_POOL_ST>-INST_ID = 1.
<GVD_BUFF_POOL_ST>-ID = 1.
<GVD_BUFF_POOL_ST>-NAME = 1.
<GVD_BUFF_POOL_ST>-BLOCK_SIZE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GVD_BUFF_POOL_ST-SET_MSIZE, sy-vline,
  WA_GVD_BUFF_POOL_ST-CNUM_REPL, sy-vline,
  WA_GVD_BUFF_POOL_ST-CNUM_WRITE, sy-vline,
  WA_GVD_BUFF_POOL_ST-CNUM_SET, sy-vline,
  WA_GVD_BUFF_POOL_ST-BUF_GOT, sy-vline,
  WA_GVD_BUFF_POOL_ST-SUM_WRITE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GVD_BUFF_POOL_ST 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_GVD_BUFF_POOL_ST 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_GVD_BUFF_POOL_ST INTO WA_GVD_BUFF_POOL_ST.


*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_GVD_BUFF_POOL_ST_STR, 
SNAPSHOT_ID TYPE STRING,
INST_ID TYPE STRING,
ID TYPE STRING,
NAME TYPE STRING,
BLOCK_SIZE TYPE STRING,
SET_MSIZE TYPE STRING,
CNUM_REPL TYPE STRING,
CNUM_WRITE TYPE STRING,
CNUM_SET TYPE STRING,
BUF_GOT TYPE STRING,
SUM_WRITE TYPE STRING,
SUM_SCAN TYPE STRING,
FREE_BUFFER_WAIT TYPE STRING,
WRITE_COMPLETE_W TYPE STRING,
BUFFER_BUSY_WAIT TYPE STRING,
FREE_BUFFER_INSP TYPE STRING,
DIRTY_BUFFERS_IN TYPE STRING,
DB_BLOCK_CHANGE TYPE STRING,
DB_BLOCK_GETS TYPE STRING,
CONSISTENT_GETS TYPE STRING,
PHYSICAL_READS TYPE STRING,
PHYSICAL_WRITES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GVD_BUFF_POOL_ST_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_GVD_BUFF_POOL_ST_STR-SNAPSHOT_ID sy-vline 
WA_GVD_BUFF_POOL_ST_STR-INST_ID sy-vline 
WA_GVD_BUFF_POOL_ST_STR-ID sy-vline 
WA_GVD_BUFF_POOL_ST_STR-NAME sy-vline 
WA_GVD_BUFF_POOL_ST_STR-BLOCK_SIZE sy-vline 
WA_GVD_BUFF_POOL_ST_STR-SET_MSIZE sy-vline 
WA_GVD_BUFF_POOL_ST_STR-CNUM_REPL sy-vline 
WA_GVD_BUFF_POOL_ST_STR-CNUM_WRITE sy-vline 
WA_GVD_BUFF_POOL_ST_STR-CNUM_SET sy-vline 
WA_GVD_BUFF_POOL_ST_STR-BUF_GOT sy-vline 
WA_GVD_BUFF_POOL_ST_STR-SUM_WRITE sy-vline 
WA_GVD_BUFF_POOL_ST_STR-SUM_SCAN sy-vline 
WA_GVD_BUFF_POOL_ST_STR-FREE_BUFFER_WAIT sy-vline 
WA_GVD_BUFF_POOL_ST_STR-WRITE_COMPLETE_W sy-vline 
WA_GVD_BUFF_POOL_ST_STR-BUFFER_BUSY_WAIT sy-vline 
WA_GVD_BUFF_POOL_ST_STR-FREE_BUFFER_INSP sy-vline 
WA_GVD_BUFF_POOL_ST_STR-DIRTY_BUFFERS_IN sy-vline 
WA_GVD_BUFF_POOL_ST_STR-DB_BLOCK_CHANGE sy-vline 
WA_GVD_BUFF_POOL_ST_STR-DB_BLOCK_GETS sy-vline 
WA_GVD_BUFF_POOL_ST_STR-CONSISTENT_GETS sy-vline 
WA_GVD_BUFF_POOL_ST_STR-PHYSICAL_READS sy-vline 
WA_GVD_BUFF_POOL_ST_STR-PHYSICAL_WRITES sy-vline      INTO ld_text SEPARATED BY SPACE.

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