ABAP Select data from SAP table DB2TBDETL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2TBDETL 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 DB2TBDETL. 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 DB2TBDETL 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_DB2TBDETL TYPE STANDARD TABLE OF DB2TBDETL,
      WA_DB2TBDETL TYPE DB2TBDETL,
      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: <DB2TBDETL> TYPE DB2TBDETL.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2TBDETL.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2TBDETL
  INTO TABLE IT_DB2TBDETL.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2TBDETL
*  INTO TABLE @DATA(IT_DB2TBDETL2).
*--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_DB2TBDETL INDEX 1 INTO DATA(WA_DB2TBDETL2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2TBDETL ASSIGNING <DB2TBDETL>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2TBDETL>-NAME = 1.
<DB2TBDETL>-CREATOR = 1.
<DB2TBDETL>-TYPE = 1.
<DB2TBDETL>-DBNAME = 1.
<DB2TBDETL>-TSNAME = 1.

ENDLOOP.

LOOP AT IT_DB2TBDETL INTO WA_DB2TBDETL.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2TBDETL-COLCOUNT, sy-vline,
  WA_DB2TBDETL-NPAGES, sy-vline,
  WA_DB2TBDETL-KEYCOLUMNS, sy-vline,
  WA_DB2TBDETL-RECLENGTH, sy-vline,
  WA_DB2TBDETL-STATUS, sy-vline,
  WA_DB2TBDETL-CREATEDTS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2TBDETL 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_DB2TBDETL 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_DB2TBDETL INTO WA_DB2TBDETL.


*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_DB2TBDETL_STR, 
NAME TYPE STRING,
CREATOR TYPE STRING,
TYPE TYPE STRING,
DBNAME TYPE STRING,
TSNAME TYPE STRING,
COLCOUNT TYPE STRING,
NPAGES TYPE STRING,
KEYCOLUMNS TYPE STRING,
RECLENGTH TYPE STRING,
STATUS TYPE STRING,
CREATEDTS TYPE STRING,
ALTEREDTS TYPE STRING,
PCTROWCOMP TYPE STRING,
STATSTIME TYPE STRING,
CARDF TYPE STRING,
SIZE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2TBDETL_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_DB2TBDETL_STR-NAME sy-vline 
WA_DB2TBDETL_STR-CREATOR sy-vline 
WA_DB2TBDETL_STR-TYPE sy-vline 
WA_DB2TBDETL_STR-DBNAME sy-vline 
WA_DB2TBDETL_STR-TSNAME sy-vline 
WA_DB2TBDETL_STR-COLCOUNT sy-vline 
WA_DB2TBDETL_STR-NPAGES sy-vline 
WA_DB2TBDETL_STR-KEYCOLUMNS sy-vline 
WA_DB2TBDETL_STR-RECLENGTH sy-vline 
WA_DB2TBDETL_STR-STATUS sy-vline 
WA_DB2TBDETL_STR-CREATEDTS sy-vline 
WA_DB2TBDETL_STR-ALTEREDTS sy-vline 
WA_DB2TBDETL_STR-PCTROWCOMP sy-vline 
WA_DB2TBDETL_STR-STATSTIME sy-vline 
WA_DB2TBDETL_STR-CARDF sy-vline 
WA_DB2TBDETL_STR-SIZE sy-vline      INTO ld_text SEPARATED BY SPACE.

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