ABAP Select data from SAP table DB2QBGAT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2QBGAT 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 DB2QBGAT. 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 DB2QBGAT 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_DB2QBGAT TYPE STANDARD TABLE OF DB2QBGAT,
      WA_DB2QBGAT TYPE DB2QBGAT,
      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: <DB2QBGAT> TYPE DB2QBGAT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2QBGAT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2QBGAT
  INTO TABLE IT_DB2QBGAT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2QBGAT
*  INTO TABLE @DATA(IT_DB2QBGAT2).
*--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_DB2QBGAT INDEX 1 INTO DATA(WA_DB2QBGAT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2QBGAT ASSIGNING <DB2QBGAT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2QBGAT>-MEMBNM = 1.
<DB2QBGAT>-ACE = 1.
<DB2QBGAT>-QBGAGN = 1.
<DB2QBGAT>-QBGAXD = 1.
<DB2QBGAT>-QBGAXR = 1.

ENDLOOP.

LOOP AT IT_DB2QBGAT INTO WA_DB2QBGAT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2QBGAT-QBGAXN, sy-vline,
  WA_DB2QBGAT-QBGAEX, sy-vline,
  WA_DB2QBGAT-QBGAMD, sy-vline,
  WA_DB2QBGAT-QBGAMR, sy-vline,
  WA_DB2QBGAT-QBGAMN, sy-vline,
  WA_DB2QBGAT-QBGASW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2QBGAT 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_DB2QBGAT 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_DB2QBGAT INTO WA_DB2QBGAT.


*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_DB2QBGAT_STR, 
MEMBNM TYPE STRING,
ACE TYPE STRING,
QBGAGN TYPE STRING,
QBGAXD TYPE STRING,
QBGAXR TYPE STRING,
QBGAXN TYPE STRING,
QBGAEX TYPE STRING,
QBGAMD TYPE STRING,
QBGAMR TYPE STRING,
QBGAMN TYPE STRING,
QBGASW TYPE STRING,
QBGAWC TYPE STRING,
QBGADG TYPE STRING,
QBGA2W TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2QBGAT_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_DB2QBGAT_STR-MEMBNM sy-vline 
WA_DB2QBGAT_STR-ACE sy-vline 
WA_DB2QBGAT_STR-QBGAGN sy-vline 
WA_DB2QBGAT_STR-QBGAXD sy-vline 
WA_DB2QBGAT_STR-QBGAXR sy-vline 
WA_DB2QBGAT_STR-QBGAXN sy-vline 
WA_DB2QBGAT_STR-QBGAEX sy-vline 
WA_DB2QBGAT_STR-QBGAMD sy-vline 
WA_DB2QBGAT_STR-QBGAMR sy-vline 
WA_DB2QBGAT_STR-QBGAMN sy-vline 
WA_DB2QBGAT_STR-QBGASW sy-vline 
WA_DB2QBGAT_STR-QBGAWC sy-vline 
WA_DB2QBGAT_STR-QBGADG sy-vline 
WA_DB2QBGAT_STR-QBGA2W sy-vline      INTO ld_text SEPARATED BY SPACE.

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