ABAP Select data from SAP table GHO_S_FC_CONSTRAINTS_DIF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GHO_S_FC_CONSTRAINTS_DIF
*  INTO TABLE @DATA(IT_GHO_S_FC_CONSTRAINTS_DIF2).
*--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_GHO_S_FC_CONSTRAINTS_DIF INDEX 1 INTO DATA(WA_GHO_S_FC_CONSTRAINTS_DIF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GHO_S_FC_CONSTRAINTS_DIF>-RECORD_TYPE = 1.
<GHO_S_FC_CONSTRAINTS_DIF>-PROJECT_NAME = 1.
<GHO_S_FC_CONSTRAINTS_DIF>-FORECAST_TYPE = 1.
<GHO_S_FC_CONSTRAINTS_DIF>-FORECAST_DATE = 1.
<GHO_S_FC_CONSTRAINTS_DIF>-PROJECT_EFF_DATE_FROM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GHO_S_FC_CONSTRAINTS_DIF-PROJECT_EFF_DATE_TO, sy-vline,
  WA_GHO_S_FC_CONSTRAINTS_DIF-SCENARIO_NAME, sy-vline,
  WA_GHO_S_FC_CONSTRAINTS_DIF-NETWORK_NAME, sy-vline,
  WA_GHO_S_FC_CONSTRAINTS_DIF-NETWORK_OBJECT_NAME, sy-vline,
  WA_GHO_S_FC_CONSTRAINTS_DIF-OBJECT_ID, sy-vline,
  WA_GHO_S_FC_CONSTRAINTS_DIF-CONSTRAINT_TYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GHO_S_FC_CONSTRAINTS_DIF 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_GHO_S_FC_CONSTRAINTS_DIF 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_GHO_S_FC_CONSTRAINTS_DIF INTO WA_GHO_S_FC_CONSTRAINTS_DIF.


*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 GHOFC, internal->external for field NETWORK_NAME
CALL FUNCTION 'CONVERSION_EXIT_GHOFC_OUTPUT'
  EXPORTING
    input =                      WA_GHO_S_FC_CONSTRAINTS_DIF-NETWORK_NAME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_S_FC_CONSTRAINTS_DIF-NETWORK_NAME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GHONO, internal->external for field NETWORK_OBJECT_NAME
CALL FUNCTION 'CONVERSION_EXIT_GHONO_OUTPUT'
  EXPORTING
    input =                      WA_GHO_S_FC_CONSTRAINTS_DIF-NETWORK_OBJECT_NAME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_S_FC_CONSTRAINTS_DIF-NETWORK_OBJECT_NAME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UOM_ID
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_GHO_S_FC_CONSTRAINTS_DIF-UOM_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_S_FC_CONSTRAINTS_DIF-UOM_ID.
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_GHO_S_FC_CONSTRAINTS_DIF_STR, 
RECORD_TYPE TYPE STRING,
PROJECT_NAME TYPE STRING,
FORECAST_TYPE TYPE STRING,
FORECAST_DATE TYPE STRING,
PROJECT_EFF_DATE_FROM TYPE STRING,
PROJECT_EFF_DATE_TO TYPE STRING,
SCENARIO_NAME TYPE STRING,
NETWORK_NAME TYPE STRING,
NETWORK_OBJECT_NAME TYPE STRING,
OBJECT_ID TYPE STRING,
CONSTRAINT_TYPE TYPE STRING,
CONSTRAINT_NAME TYPE STRING,
EFF_DATE_FROM TYPE STRING,
EFF_DATE_TO TYPE STRING,
CONSTRAINT_ITEM_DESC TYPE STRING,
MEDIUM_ID TYPE STRING,
DIMENSION TYPE STRING,
REL_OPERATOR TYPE STRING,
CONSTRAINT_VALUE TYPE STRING,
UOM_ID TYPE STRING,
MEASUREMENT TYPE STRING,
OPERATION_INDICATOR TYPE STRING,
ROW_COUNT TYPE STRING,
EVENT_CODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GHO_S_FC_CONSTRAINTS_DIF_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_GHO_S_FC_CONSTRAINTS_DIF_STR-RECORD_TYPE sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-PROJECT_NAME sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-FORECAST_TYPE sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-FORECAST_DATE sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-PROJECT_EFF_DATE_FROM sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-PROJECT_EFF_DATE_TO sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-SCENARIO_NAME sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-NETWORK_NAME sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-NETWORK_OBJECT_NAME sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-OBJECT_ID sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-CONSTRAINT_TYPE sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-CONSTRAINT_NAME sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-EFF_DATE_FROM sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-EFF_DATE_TO sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-CONSTRAINT_ITEM_DESC sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-MEDIUM_ID sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-DIMENSION sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-REL_OPERATOR sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-CONSTRAINT_VALUE sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-UOM_ID sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-MEASUREMENT sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-OPERATION_INDICATOR sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-ROW_COUNT sy-vline 
WA_GHO_S_FC_CONSTRAINTS_DIF_STR-EVENT_CODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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