ABAP Select data from SAP table GVD_UNDOSTAT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP GVD_UNDOSTAT 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_UNDOSTAT. 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_UNDOSTAT 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_UNDOSTAT TYPE STANDARD TABLE OF GVD_UNDOSTAT,
      WA_GVD_UNDOSTAT TYPE GVD_UNDOSTAT,
      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_UNDOSTAT> TYPE GVD_UNDOSTAT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GVD_UNDOSTAT
*  INTO TABLE @DATA(IT_GVD_UNDOSTAT2).
*--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_UNDOSTAT INDEX 1 INTO DATA(WA_GVD_UNDOSTAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GVD_UNDOSTAT>-SNAPSHOT_ID = 1.
<GVD_UNDOSTAT>-INST_ID = 1.
<GVD_UNDOSTAT>-BEGIN_TIME_D = 1.
<GVD_UNDOSTAT>-BEGIN_TIME_T = 1.
<GVD_UNDOSTAT>-END_TIME_D = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GVD_UNDOSTAT-END_TIME_T, sy-vline,
  WA_GVD_UNDOSTAT-UNDOTSN, sy-vline,
  WA_GVD_UNDOSTAT-UNDOBLKS, sy-vline,
  WA_GVD_UNDOSTAT-TXNCOUNT, sy-vline,
  WA_GVD_UNDOSTAT-MAXQUERYLEN, sy-vline,
  WA_GVD_UNDOSTAT-MAXCONCURRENCY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GVD_UNDOSTAT 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_UNDOSTAT 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_UNDOSTAT INTO WA_GVD_UNDOSTAT.


*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_UNDOSTAT_STR, 
SNAPSHOT_ID TYPE STRING,
INST_ID TYPE STRING,
BEGIN_TIME_D TYPE STRING,
BEGIN_TIME_T TYPE STRING,
END_TIME_D TYPE STRING,
END_TIME_T TYPE STRING,
UNDOTSN TYPE STRING,
UNDOBLKS TYPE STRING,
TXNCOUNT TYPE STRING,
MAXQUERYLEN TYPE STRING,
MAXCONCURRENCY TYPE STRING,
UNXPSTEALCNT TYPE STRING,
UNXPBLKRELCNT TYPE STRING,
UNXPBLKREUCNT TYPE STRING,
EXPSTEALCNT TYPE STRING,
EXPBLKRELCNT TYPE STRING,
EXPBLKREUCNT TYPE STRING,
SSOLDERRCNT TYPE STRING,
NOSPACEERRCNT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GVD_UNDOSTAT_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_UNDOSTAT_STR-SNAPSHOT_ID sy-vline 
WA_GVD_UNDOSTAT_STR-INST_ID sy-vline 
WA_GVD_UNDOSTAT_STR-BEGIN_TIME_D sy-vline 
WA_GVD_UNDOSTAT_STR-BEGIN_TIME_T sy-vline 
WA_GVD_UNDOSTAT_STR-END_TIME_D sy-vline 
WA_GVD_UNDOSTAT_STR-END_TIME_T sy-vline 
WA_GVD_UNDOSTAT_STR-UNDOTSN sy-vline 
WA_GVD_UNDOSTAT_STR-UNDOBLKS sy-vline 
WA_GVD_UNDOSTAT_STR-TXNCOUNT sy-vline 
WA_GVD_UNDOSTAT_STR-MAXQUERYLEN sy-vline 
WA_GVD_UNDOSTAT_STR-MAXCONCURRENCY sy-vline 
WA_GVD_UNDOSTAT_STR-UNXPSTEALCNT sy-vline 
WA_GVD_UNDOSTAT_STR-UNXPBLKRELCNT sy-vline 
WA_GVD_UNDOSTAT_STR-UNXPBLKREUCNT sy-vline 
WA_GVD_UNDOSTAT_STR-EXPSTEALCNT sy-vline 
WA_GVD_UNDOSTAT_STR-EXPBLKRELCNT sy-vline 
WA_GVD_UNDOSTAT_STR-EXPBLKREUCNT sy-vline 
WA_GVD_UNDOSTAT_STR-SSOLDERRCNT sy-vline 
WA_GVD_UNDOSTAT_STR-NOSPACEERRCNT sy-vline      INTO ld_text SEPARATED BY SPACE.

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