ABAP Select data from SAP table GWY_STRUCT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GWY_STRUCT
*  INTO TABLE @DATA(IT_GWY_STRUCT2).
*--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_GWY_STRUCT INDEX 1 INTO DATA(WA_GWY_STRUCT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GWY_STRUCT>-ACTIVE = 1.
<GWY_STRUCT>-BLOCKNO = 1.
<GWY_STRUCT>-SYSIDX = 1.
<GWY_STRUCT>-CONN = 1.
<GWY_STRUCT>-NO_CONN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GWY_STRUCT-NO_PROC, sy-vline,
  WA_GWY_STRUCT-IN_USE, sy-vline,
  WA_GWY_STRUCT-GWHOST, sy-vline,
  WA_GWY_STRUCT-GWSERV, sy-vline,
  WA_GWY_STRUCT-WP_NO, sy-vline,
  WA_GWY_STRUCT-NOREG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GWY_STRUCT 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_GWY_STRUCT 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_GWY_STRUCT INTO WA_GWY_STRUCT.


*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 IPADD, internal->external for field ADDR_V4
CALL FUNCTION 'CONVERSION_EXIT_IPADD_OUTPUT'
  EXPORTING
    input =                      WA_GWY_STRUCT-ADDR_V4
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GWY_STRUCT-ADDR_V4.
WRITE:/ 'New Value:', ld_input.

*Conversion exit IPADD, internal->external for field ADDR_V6
CALL FUNCTION 'CONVERSION_EXIT_IPADD_OUTPUT'
  EXPORTING
    input =                      WA_GWY_STRUCT-ADDR_V6
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GWY_STRUCT-ADDR_V6.
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_GWY_STRUCT_STR, 
ACTIVE TYPE STRING,
BLOCKNO TYPE STRING,
SYSIDX TYPE STRING,
CONN TYPE STRING,
NO_CONN TYPE STRING,
NO_PROC TYPE STRING,
IN_USE TYPE STRING,
GWHOST TYPE STRING,
GWSERV TYPE STRING,
WP_NO TYPE STRING,
NOREG TYPE STRING,
FLAG TYPE STRING,
PNAME TYPE STRING,
PVALUE TYPE STRING,
CONVID TYPE STRING,
LU TYPE STRING,
TP TYPE STRING,
SYSTYPE TYPE STRING,
ADDR TYPE STRING,
ADDR_V4 TYPE STRING,
ADDR_V6 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GWY_STRUCT_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_GWY_STRUCT_STR-ACTIVE sy-vline 
WA_GWY_STRUCT_STR-BLOCKNO sy-vline 
WA_GWY_STRUCT_STR-SYSIDX sy-vline 
WA_GWY_STRUCT_STR-CONN sy-vline 
WA_GWY_STRUCT_STR-NO_CONN sy-vline 
WA_GWY_STRUCT_STR-NO_PROC sy-vline 
WA_GWY_STRUCT_STR-IN_USE sy-vline 
WA_GWY_STRUCT_STR-GWHOST sy-vline 
WA_GWY_STRUCT_STR-GWSERV sy-vline 
WA_GWY_STRUCT_STR-WP_NO sy-vline 
WA_GWY_STRUCT_STR-NOREG sy-vline 
WA_GWY_STRUCT_STR-FLAG sy-vline 
WA_GWY_STRUCT_STR-PNAME sy-vline 
WA_GWY_STRUCT_STR-PVALUE sy-vline 
WA_GWY_STRUCT_STR-CONVID sy-vline 
WA_GWY_STRUCT_STR-LU sy-vline 
WA_GWY_STRUCT_STR-TP sy-vline 
WA_GWY_STRUCT_STR-SYSTYPE sy-vline 
WA_GWY_STRUCT_STR-ADDR sy-vline 
WA_GWY_STRUCT_STR-ADDR_V4 sy-vline 
WA_GWY_STRUCT_STR-ADDR_V6 sy-vline      INTO ld_text SEPARATED BY SPACE.

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