ABAP Select data from SAP table T331 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T331 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 T331. 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 T331 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_T331 TYPE STANDARD TABLE OF T331,
      WA_T331 TYPE T331,
      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: <T331> TYPE T331.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T331.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T331
  INTO TABLE IT_T331.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T331
*  INTO TABLE @DATA(IT_T3312).
*--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_T331 INDEX 1 INTO DATA(WA_T3312).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T331 ASSIGNING <T331>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T331>-MANDT = 1.
<T331>-LGNUM = 1.
<T331>-LGTYP = 1.
<T331>-KZNKO = 1.
<T331>-KAPAP = 1.

ENDLOOP.

LOOP AT IT_T331 INTO WA_T331.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T331-QUEIN, sy-vline,
  WA_T331-QUAUS, sy-vline,
  WA_T331-VOLLE, sy-vline,
  WA_T331-MISCH, sy-vline,
  WA_T331-ZULAG, sy-vline,
  WA_T331-NEGAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T331 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_T331 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_T331 INTO WA_T331.


*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.

*Conversion exit SPDEV, internal->external for field LDEST
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_T331-LDEST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T331-LDEST.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_T331_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
KZNKO TYPE STRING,
KAPAP TYPE STRING,
QUEIN TYPE STRING,
QUAUS TYPE STRING,
VOLLE TYPE STRING,
MISCH TYPE STRING,
ZULAG TYPE STRING,
NEGAT TYPE STRING,
VRUCK TYPE STRING,
UEBER TYPE STRING,
RLTYP TYPE STRING,
STAUS TYPE STRING,
STEIN TYPE STRING,
KZINV TYPE STRING,
SKZEI TYPE STRING,
SKZAU TYPE STRING,
LDEST TYPE STRING,
SFIFO TYPE STRING,
SPEIN TYPE STRING,
SPAUS TYPE STRING,
SPGRU TYPE STRING,
PRLET TYPE STRING,
PRBER TYPE STRING,
WGFKL TYPE STRING,
GEFAL TYPE STRING,
KZUAP TYPE STRING,
INVPE TYPE STRING,
INVPN TYPE STRING,
LENVW TYPE STRING,
IPUNK TYPE STRING,
IPTYP TYPE STRING,
KPUNK TYPE STRING,
KPTYP TYPE STRING,
BWWMP TYPE STRING,
USEIN TYPE STRING,
USAUS TYPE STRING,
MAILK TYPE STRING,
INVCC TYPE STRING,
MINWM TYPE STRING,
MRAUS TYPE STRING,
TBZUG TYPE STRING,
MEAUS TYPE STRING,
MEEIN TYPE STRING,
AKTKA TYPE STRING,
RDMNG TYPE STRING,
NPLEI TYPE STRING,
PIKTA TYPE STRING,
NOGRE TYPE STRING,
NOGIS TYPE STRING,
NOTRP TYPE STRING,
NODIF TYPE STRING,
REPLT TYPE STRING,
PROFILE TYPE STRING,
LZONE TYPE STRING,
XCORD TYPE STRING,
YCORD TYPE STRING,
ZCORD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T331_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_T331_STR-MANDT sy-vline 
WA_T331_STR-LGNUM sy-vline 
WA_T331_STR-LGTYP sy-vline 
WA_T331_STR-KZNKO sy-vline 
WA_T331_STR-KAPAP sy-vline 
WA_T331_STR-QUEIN sy-vline 
WA_T331_STR-QUAUS sy-vline 
WA_T331_STR-VOLLE sy-vline 
WA_T331_STR-MISCH sy-vline 
WA_T331_STR-ZULAG sy-vline 
WA_T331_STR-NEGAT sy-vline 
WA_T331_STR-VRUCK sy-vline 
WA_T331_STR-UEBER sy-vline 
WA_T331_STR-RLTYP sy-vline 
WA_T331_STR-STAUS sy-vline 
WA_T331_STR-STEIN sy-vline 
WA_T331_STR-KZINV sy-vline 
WA_T331_STR-SKZEI sy-vline 
WA_T331_STR-SKZAU sy-vline 
WA_T331_STR-LDEST sy-vline 
WA_T331_STR-SFIFO sy-vline 
WA_T331_STR-SPEIN sy-vline 
WA_T331_STR-SPAUS sy-vline 
WA_T331_STR-SPGRU sy-vline 
WA_T331_STR-PRLET sy-vline 
WA_T331_STR-PRBER sy-vline 
WA_T331_STR-WGFKL sy-vline 
WA_T331_STR-GEFAL sy-vline 
WA_T331_STR-KZUAP sy-vline 
WA_T331_STR-INVPE sy-vline 
WA_T331_STR-INVPN sy-vline 
WA_T331_STR-LENVW sy-vline 
WA_T331_STR-IPUNK sy-vline 
WA_T331_STR-IPTYP sy-vline 
WA_T331_STR-KPUNK sy-vline 
WA_T331_STR-KPTYP sy-vline 
WA_T331_STR-BWWMP sy-vline 
WA_T331_STR-USEIN sy-vline 
WA_T331_STR-USAUS sy-vline 
WA_T331_STR-MAILK sy-vline 
WA_T331_STR-INVCC sy-vline 
WA_T331_STR-MINWM sy-vline 
WA_T331_STR-MRAUS sy-vline 
WA_T331_STR-TBZUG sy-vline 
WA_T331_STR-MEAUS sy-vline 
WA_T331_STR-MEEIN sy-vline 
WA_T331_STR-AKTKA sy-vline 
WA_T331_STR-RDMNG sy-vline 
WA_T331_STR-NPLEI sy-vline 
WA_T331_STR-PIKTA sy-vline 
WA_T331_STR-NOGRE sy-vline 
WA_T331_STR-NOGIS sy-vline 
WA_T331_STR-NOTRP sy-vline 
WA_T331_STR-NODIF sy-vline 
WA_T331_STR-REPLT sy-vline 
WA_T331_STR-PROFILE sy-vline 
WA_T331_STR-LZONE sy-vline 
WA_T331_STR-XCORD sy-vline 
WA_T331_STR-YCORD sy-vline 
WA_T331_STR-ZCORD sy-vline      INTO ld_text SEPARATED BY SPACE.

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