ABAP Select data from SAP table GTCN_ENTRANCEITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GTCN_ENTRANCEITEM
*  INTO TABLE @DATA(IT_GTCN_ENTRANCEITEM2).
*--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_GTCN_ENTRANCEITEM INDEX 1 INTO DATA(WA_GTCN_ENTRANCEITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GTCN_ENTRANCEITEM>-TKONN = 1.
<GTCN_ENTRANCEITEM>-TPOSN = 1.
<GTCN_ENTRANCEITEM>-IDNLF = 1.
<GTCN_ENTRANCEITEM>-MENGE = 1.
<GTCN_ENTRANCEITEM>-MEINS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GTCN_ENTRANCEITEM-WAERS_MM, sy-vline,
  WA_GTCN_ENTRANCEITEM-NETPR_MM, sy-vline,
  WA_GTCN_ENTRANCEITEM-UNTTO_MM, sy-vline,
  WA_GTCN_ENTRANCEITEM-UEBTO_MM, sy-vline,
  WA_GTCN_ENTRANCEITEM-LAND1, sy-vline,
  WA_GTCN_ENTRANCEITEM-IHREZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GTCN_ENTRANCEITEM 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_GTCN_ENTRANCEITEM 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_GTCN_ENTRANCEITEM INTO WA_GTCN_ENTRANCEITEM.


*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 ALPHA, internal->external for field TKONN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GTCN_ENTRANCEITEM-TKONN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GTCN_ENTRANCEITEM-TKONN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_GTCN_ENTRANCEITEM-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GTCN_ENTRANCEITEM-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GTCN_ENTRANCEITEM-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GTCN_ENTRANCEITEM-EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_GTCN_ENTRANCEITEM-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GTCN_ENTRANCEITEM-MATNR.
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_GTCN_ENTRANCEITEM_STR, 
TKONN TYPE STRING,
TPOSN TYPE STRING,
IDNLF TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
WAERS_MM TYPE STRING,
NETPR_MM TYPE STRING,
UNTTO_MM TYPE STRING,
UEBTO_MM TYPE STRING,
LAND1 TYPE STRING,
IHREZ TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
WAERS TYPE STRING,
KBETR TYPE STRING,
KWERT TYPE STRING,
MATNR TYPE STRING,
MAKTX TYPE STRING,
M20 TYPE STRING,
KB21 TYPE STRING,
KW23 TYPE STRING,
GROES TYPE STRING,
JYWB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GTCN_ENTRANCEITEM_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_GTCN_ENTRANCEITEM_STR-TKONN sy-vline 
WA_GTCN_ENTRANCEITEM_STR-TPOSN sy-vline 
WA_GTCN_ENTRANCEITEM_STR-IDNLF sy-vline 
WA_GTCN_ENTRANCEITEM_STR-MENGE sy-vline 
WA_GTCN_ENTRANCEITEM_STR-MEINS sy-vline 
WA_GTCN_ENTRANCEITEM_STR-WAERS_MM sy-vline 
WA_GTCN_ENTRANCEITEM_STR-NETPR_MM sy-vline 
WA_GTCN_ENTRANCEITEM_STR-UNTTO_MM sy-vline 
WA_GTCN_ENTRANCEITEM_STR-UEBTO_MM sy-vline 
WA_GTCN_ENTRANCEITEM_STR-LAND1 sy-vline 
WA_GTCN_ENTRANCEITEM_STR-IHREZ sy-vline 
WA_GTCN_ENTRANCEITEM_STR-EBELN sy-vline 
WA_GTCN_ENTRANCEITEM_STR-EBELP sy-vline 
WA_GTCN_ENTRANCEITEM_STR-WAERS sy-vline 
WA_GTCN_ENTRANCEITEM_STR-KBETR sy-vline 
WA_GTCN_ENTRANCEITEM_STR-KWERT sy-vline 
WA_GTCN_ENTRANCEITEM_STR-MATNR sy-vline 
WA_GTCN_ENTRANCEITEM_STR-MAKTX sy-vline 
WA_GTCN_ENTRANCEITEM_STR-M20 sy-vline 
WA_GTCN_ENTRANCEITEM_STR-KB21 sy-vline 
WA_GTCN_ENTRANCEITEM_STR-KW23 sy-vline 
WA_GTCN_ENTRANCEITEM_STR-GROES sy-vline 
WA_GTCN_ENTRANCEITEM_STR-JYWB sy-vline      INTO ld_text SEPARATED BY SPACE.

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