ABAP Select data from SAP table Q3339 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP Q3339 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 Q3339. 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 Q3339 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_Q3339 TYPE STANDARD TABLE OF Q3339,
      WA_Q3339 TYPE Q3339,
      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: <Q3339> TYPE Q3339.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_Q3339.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM Q3339
  INTO TABLE IT_Q3339.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM Q3339
*  INTO TABLE @DATA(IT_Q33392).
*--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_Q3339 INDEX 1 INTO DATA(WA_Q33392).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_Q3339 ASSIGNING <Q3339>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<Q3339>-TDAMT = 1.
<Q3339>-TDCUR = 1.
<Q3339>-ITAMT = 1.
<Q3339>-ITCUR = 1.
<Q3339>-FRAMT = 1.

ENDLOOP.

LOOP AT IT_Q3339 INTO WA_Q3339.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_Q3339-FRCUR, sy-vline,
  WA_Q3339-RRAMT, sy-vline,
  WA_Q3339-RRCUR, sy-vline,
  WA_Q3339-PAYLO, sy-vline,
  WA_Q3339-PAYCU, sy-vline,
  WA_Q3339-ABRDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_Q3339 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_Q3339 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_Q3339 INTO WA_Q3339.


*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_Q3339_STR, 
TDAMT TYPE STRING,
TDCUR TYPE STRING,
ITAMT TYPE STRING,
ITCUR TYPE STRING,
FRAMT TYPE STRING,
FRCUR TYPE STRING,
RRAMT TYPE STRING,
RRCUR TYPE STRING,
PAYLO TYPE STRING,
PAYCU TYPE STRING,
ABRDT TYPE STRING,
DLEND TYPE STRING,
BEGDAF TYPE STRING,
ENDDAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_Q3339_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_Q3339_STR-TDAMT sy-vline 
WA_Q3339_STR-TDCUR sy-vline 
WA_Q3339_STR-ITAMT sy-vline 
WA_Q3339_STR-ITCUR sy-vline 
WA_Q3339_STR-FRAMT sy-vline 
WA_Q3339_STR-FRCUR sy-vline 
WA_Q3339_STR-RRAMT sy-vline 
WA_Q3339_STR-RRCUR sy-vline 
WA_Q3339_STR-PAYLO sy-vline 
WA_Q3339_STR-PAYCU sy-vline 
WA_Q3339_STR-ABRDT sy-vline 
WA_Q3339_STR-DLEND sy-vline 
WA_Q3339_STR-BEGDAF sy-vline 
WA_Q3339_STR-ENDDAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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