ABAP Select data from SAP table /SDF/INF_TBLEXTENTS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SDF/INF_TBLEXTENTS 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 /SDF/INF_TBLEXTENTS. 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 /SDF/INF_TBLEXTENTS 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_/SDF/INF_TBLEXTENTS TYPE STANDARD TABLE OF /SDF/INF_TBLEXTENTS,
      WA_/SDF/INF_TBLEXTENTS TYPE /SDF/INF_TBLEXTENTS,
      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: </SDF/INF_TBLEXTENTS> TYPE /SDF/INF_TBLEXTENTS.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SDF/INF_TBLEXTENTS
  INTO TABLE IT_/SDF/INF_TBLEXTENTS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SDF/INF_TBLEXTENTS
*  INTO TABLE @DATA(IT_/SDF/INF_TBLEXTENTS2).
*--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_/SDF/INF_TBLEXTENTS INDEX 1 INTO DATA(WA_/SDF/INF_TBLEXTENTS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SDF/INF_TBLEXTENTS ASSIGNING </SDF/INF_TBLEXTENTS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SDF/INF_TBLEXTENTS>-DBSPACE = 1.
</SDF/INF_TBLEXTENTS>-TABNAME = 1.
</SDF/INF_TBLEXTENTS>-OWNER = 1.
</SDF/INF_TBLEXTENTS>-NROWS = 1.
</SDF/INF_TBLEXTENTS>-NBYTES = 1.

ENDLOOP.

LOOP AT IT_/SDF/INF_TBLEXTENTS INTO WA_/SDF/INF_TBLEXTENTS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SDF/INF_TBLEXTENTS-NPUSED, sy-vline,
  WA_/SDF/INF_TBLEXTENTS-NPTOTAL, sy-vline,
  WA_/SDF/INF_TBLEXTENTS-FEXTSIZ, sy-vline,
  WA_/SDF/INF_TBLEXTENTS-NEXTSIZ, sy-vline,
  WA_/SDF/INF_TBLEXTENTS-NEXTNS, sy-vline,
  WA_/SDF/INF_TBLEXTENTS-PARTNUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SDF/INF_TBLEXTENTS 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_/SDF/INF_TBLEXTENTS 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_/SDF/INF_TBLEXTENTS INTO WA_/SDF/INF_TBLEXTENTS.


*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_/SDF/INF_TBLEXTENTS_STR, 
DBSPACE TYPE STRING,
TABNAME TYPE STRING,
OWNER TYPE STRING,
NROWS TYPE STRING,
NBYTES TYPE STRING,
NPUSED TYPE STRING,
NPTOTAL TYPE STRING,
FEXTSIZ TYPE STRING,
NEXTSIZ TYPE STRING,
NEXTNS TYPE STRING,
PARTNUM TYPE STRING,
MAXEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SDF/INF_TBLEXTENTS_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_/SDF/INF_TBLEXTENTS_STR-DBSPACE sy-vline 
WA_/SDF/INF_TBLEXTENTS_STR-TABNAME sy-vline 
WA_/SDF/INF_TBLEXTENTS_STR-OWNER sy-vline 
WA_/SDF/INF_TBLEXTENTS_STR-NROWS sy-vline 
WA_/SDF/INF_TBLEXTENTS_STR-NBYTES sy-vline 
WA_/SDF/INF_TBLEXTENTS_STR-NPUSED sy-vline 
WA_/SDF/INF_TBLEXTENTS_STR-NPTOTAL sy-vline 
WA_/SDF/INF_TBLEXTENTS_STR-FEXTSIZ sy-vline 
WA_/SDF/INF_TBLEXTENTS_STR-NEXTSIZ sy-vline 
WA_/SDF/INF_TBLEXTENTS_STR-NEXTNS sy-vline 
WA_/SDF/INF_TBLEXTENTS_STR-PARTNUM sy-vline 
WA_/SDF/INF_TBLEXTENTS_STR-MAXEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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