ABAP Select data from SAP table GTCN_ENTRANCEHEAD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP GTCN_ENTRANCEHEAD 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_ENTRANCEHEAD. 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_ENTRANCEHEAD 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_ENTRANCEHEAD TYPE STANDARD TABLE OF GTCN_ENTRANCEHEAD,
      WA_GTCN_ENTRANCEHEAD TYPE GTCN_ENTRANCEHEAD,
      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_ENTRANCEHEAD> TYPE GTCN_ENTRANCEHEAD.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GTCN_ENTRANCEHEAD
*  INTO TABLE @DATA(IT_GTCN_ENTRANCEHEAD2).
*--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_ENTRANCEHEAD INDEX 1 INTO DATA(WA_GTCN_ENTRANCEHEAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GTCN_ENTRANCEHEAD>-NAME1 = 1.
<GTCN_ENTRANCEHEAD>-STREET = 1.
<GTCN_ENTRANCEHEAD>-HOUSENUM1 = 1.
<GTCN_ENTRANCEHEAD>-CITY1 = 1.
<GTCN_ENTRANCEHEAD>-COUNTRY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GTCN_ENTRANCEHEAD-TEL_NUMBER, sy-vline,
  WA_GTCN_ENTRANCEHEAD-FAX_NUMBER, sy-vline,
  WA_GTCN_ENTRANCEHEAD-TKONN_TO, sy-vline,
  WA_GTCN_ENTRANCEHEAD-IHREZ, sy-vline,
  WA_GTCN_ENTRANCEHEAD-ERDAT, sy-vline,
  WA_GTCN_ENTRANCEHEAD-INCO1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GTCN_ENTRANCEHEAD 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_ENTRANCEHEAD 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_ENTRANCEHEAD INTO WA_GTCN_ENTRANCEHEAD.


*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_TO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GTCN_ENTRANCEHEAD-TKONN_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GTCN_ENTRANCEHEAD-TKONN_TO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TKONN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GTCN_ENTRANCEHEAD-TKONN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GTCN_ENTRANCEHEAD-TKONN.
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_ENTRANCEHEAD_STR, 
NAME1 TYPE STRING,
STREET TYPE STRING,
HOUSENUM1 TYPE STRING,
CITY1 TYPE STRING,
COUNTRY TYPE STRING,
TEL_NUMBER TYPE STRING,
FAX_NUMBER TYPE STRING,
TKONN_TO TYPE STRING,
IHREZ TYPE STRING,
ERDAT TYPE STRING,
INCO1 TYPE STRING,
INCO2 TYPE STRING,
ZTERM TYPE STRING,
TKONN TYPE STRING,
NAME2 TYPE STRING,
TOTAL TYPE STRING,
WAERS TYPE STRING,
OTHER TYPE STRING,
OTHER_TEXT TYPE STRING,
UNTTO_MM TYPE STRING,
UEBTO_MM TYPE STRING,
LAND1 TYPE STRING,
DESIGNATEDPORTS TYPE STRING,
BEZEI TYPE STRING,
T23 TYPE STRING,
O23 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GTCN_ENTRANCEHEAD_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_ENTRANCEHEAD_STR-NAME1 sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-STREET sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-HOUSENUM1 sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-CITY1 sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-COUNTRY sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-TEL_NUMBER sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-FAX_NUMBER sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-TKONN_TO sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-IHREZ sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-ERDAT sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-INCO1 sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-INCO2 sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-ZTERM sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-TKONN sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-NAME2 sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-TOTAL sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-WAERS sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-OTHER sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-OTHER_TEXT sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-UNTTO_MM sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-UEBTO_MM sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-LAND1 sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-DESIGNATEDPORTS sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-BEZEI sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-T23 sy-vline 
WA_GTCN_ENTRANCEHEAD_STR-O23 sy-vline      INTO ld_text SEPARATED BY SPACE.

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