ABAP Select data from SAP table GVD_DATAFILE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP GVD_DATAFILE 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_DATAFILE. 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_DATAFILE 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_DATAFILE TYPE STANDARD TABLE OF GVD_DATAFILE,
      WA_GVD_DATAFILE TYPE GVD_DATAFILE,
      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_DATAFILE> TYPE GVD_DATAFILE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GVD_DATAFILE
*  INTO TABLE @DATA(IT_GVD_DATAFILE2).
*--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_DATAFILE INDEX 1 INTO DATA(WA_GVD_DATAFILE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GVD_DATAFILE>-SNAPSHOT_ID = 1.
<GVD_DATAFILE>-INST_ID = 1.
<GVD_DATAFILE>-FILE_DATAFILE = 1.
<GVD_DATAFILE>-CREATION_CHANGE = 1.
<GVD_DATAFILE>-CREATION_TIME_D = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GVD_DATAFILE-CREATION_TIME_T, sy-vline,
  WA_GVD_DATAFILE-TS, sy-vline,
  WA_GVD_DATAFILE-RFILE, sy-vline,
  WA_GVD_DATAFILE-STATUS, sy-vline,
  WA_GVD_DATAFILE-ENABLED, sy-vline,
  WA_GVD_DATAFILE-CHECKPOINT_CHANG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GVD_DATAFILE 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_DATAFILE 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_DATAFILE INTO WA_GVD_DATAFILE.


*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_DATAFILE_STR, 
SNAPSHOT_ID TYPE STRING,
INST_ID TYPE STRING,
FILE_DATAFILE TYPE STRING,
CREATION_CHANGE TYPE STRING,
CREATION_TIME_D TYPE STRING,
CREATION_TIME_T TYPE STRING,
TS TYPE STRING,
RFILE TYPE STRING,
STATUS TYPE STRING,
ENABLED TYPE STRING,
CHECKPOINT_CHANG TYPE STRING,
CHECKPOINT_TIMED TYPE STRING,
CHECKPOINT_TIMET TYPE STRING,
UNRECOVERABLE_CH TYPE STRING,
UNRECOVERABLE_TD TYPE STRING,
UNRECOVERABLE_TT TYPE STRING,
LAST_CHANGE TYPE STRING,
LAST_TIME_D TYPE STRING,
LAST_TIME_T TYPE STRING,
OFFLINE_CHANGE TYPE STRING,
ONLINE_CHANGE TYPE STRING,
ONLINE_TIME_D TYPE STRING,
ONLINE_TIME_T TYPE STRING,
BYTES TYPE STRING,
BLOCKS TYPE STRING,
CREATE_BYTES TYPE STRING,
BLOCK_SIZE TYPE STRING,
NAME TYPE STRING,
PLUGGED_IN TYPE STRING,
BLOCK1_OFFSET TYPE STRING,
AUX_NAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GVD_DATAFILE_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_DATAFILE_STR-SNAPSHOT_ID sy-vline 
WA_GVD_DATAFILE_STR-INST_ID sy-vline 
WA_GVD_DATAFILE_STR-FILE_DATAFILE sy-vline 
WA_GVD_DATAFILE_STR-CREATION_CHANGE sy-vline 
WA_GVD_DATAFILE_STR-CREATION_TIME_D sy-vline 
WA_GVD_DATAFILE_STR-CREATION_TIME_T sy-vline 
WA_GVD_DATAFILE_STR-TS sy-vline 
WA_GVD_DATAFILE_STR-RFILE sy-vline 
WA_GVD_DATAFILE_STR-STATUS sy-vline 
WA_GVD_DATAFILE_STR-ENABLED sy-vline 
WA_GVD_DATAFILE_STR-CHECKPOINT_CHANG sy-vline 
WA_GVD_DATAFILE_STR-CHECKPOINT_TIMED sy-vline 
WA_GVD_DATAFILE_STR-CHECKPOINT_TIMET sy-vline 
WA_GVD_DATAFILE_STR-UNRECOVERABLE_CH sy-vline 
WA_GVD_DATAFILE_STR-UNRECOVERABLE_TD sy-vline 
WA_GVD_DATAFILE_STR-UNRECOVERABLE_TT sy-vline 
WA_GVD_DATAFILE_STR-LAST_CHANGE sy-vline 
WA_GVD_DATAFILE_STR-LAST_TIME_D sy-vline 
WA_GVD_DATAFILE_STR-LAST_TIME_T sy-vline 
WA_GVD_DATAFILE_STR-OFFLINE_CHANGE sy-vline 
WA_GVD_DATAFILE_STR-ONLINE_CHANGE sy-vline 
WA_GVD_DATAFILE_STR-ONLINE_TIME_D sy-vline 
WA_GVD_DATAFILE_STR-ONLINE_TIME_T sy-vline 
WA_GVD_DATAFILE_STR-BYTES sy-vline 
WA_GVD_DATAFILE_STR-BLOCKS sy-vline 
WA_GVD_DATAFILE_STR-CREATE_BYTES sy-vline 
WA_GVD_DATAFILE_STR-BLOCK_SIZE sy-vline 
WA_GVD_DATAFILE_STR-NAME sy-vline 
WA_GVD_DATAFILE_STR-PLUGGED_IN sy-vline 
WA_GVD_DATAFILE_STR-BLOCK1_OFFSET sy-vline 
WA_GVD_DATAFILE_STR-AUX_NAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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