ABAP Select data from SAP table /GBT/S_MDIT_NODE_STRUCT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /GBT/S_MDIT_NODE_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 /GBT/S_MDIT_NODE_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 /GBT/S_MDIT_NODE_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_/GBT/S_MDIT_NODE_STRUCT TYPE STANDARD TABLE OF /GBT/S_MDIT_NODE_STRUCT,
      WA_/GBT/S_MDIT_NODE_STRUCT TYPE /GBT/S_MDIT_NODE_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: </GBT/S_MDIT_NODE_STRUCT> TYPE /GBT/S_MDIT_NODE_STRUCT.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /GBT/S_MDIT_NODE_STRUCT
  INTO TABLE IT_/GBT/S_MDIT_NODE_STRUCT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /GBT/S_MDIT_NODE_STRUCT
*  INTO TABLE @DATA(IT_/GBT/S_MDIT_NODE_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_/GBT/S_MDIT_NODE_STRUCT INDEX 1 INTO DATA(WA_/GBT/S_MDIT_NODE_STRUCT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/GBT/S_MDIT_NODE_STRUCT ASSIGNING </GBT/S_MDIT_NODE_STRUCT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</GBT/S_MDIT_NODE_STRUCT>-OBJ_GUID = 1.
</GBT/S_MDIT_NODE_STRUCT>-MDOCNR = 1.
</GBT/S_MDIT_NODE_STRUCT>-MDOCYR = 1.
</GBT/S_MDIT_NODE_STRUCT>-MDOCIT = 1.
</GBT/S_MDIT_NODE_STRUCT>-LOGSYS = 1.

ENDLOOP.

LOOP AT IT_/GBT/S_MDIT_NODE_STRUCT INTO WA_/GBT/S_MDIT_NODE_STRUCT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/GBT/S_MDIT_NODE_STRUCT-MAT_DESCR, sy-vline,
  WA_/GBT/S_MDIT_NODE_STRUCT-PRODUCT_GUID, sy-vline,
  WA_/GBT/S_MDIT_NODE_STRUCT-INSERTED_AT, sy-vline,
  WA_/GBT/S_MDIT_NODE_STRUCT-MODIFIED_AT, sy-vline,
  WA_/GBT/S_MDIT_NODE_STRUCT-CREATED_DATE, sy-vline,
  WA_/GBT/S_MDIT_NODE_STRUCT-CREATED_TIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/GBT/S_MDIT_NODE_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_/GBT/S_MDIT_NODE_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_/GBT/S_MDIT_NODE_STRUCT INTO WA_/GBT/S_MDIT_NODE_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 ALPHA, internal->external for field MDOCNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/GBT/S_MDIT_NODE_STRUCT-MDOCNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/GBT/S_MDIT_NODE_STRUCT-MDOCNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GBTM1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_GBTM1_OUTPUT'
  EXPORTING
    input =                      WA_/GBT/S_MDIT_NODE_STRUCT-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/GBT/S_MDIT_NODE_STRUCT-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field MDOCNR_REF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/GBT/S_MDIT_NODE_STRUCT-MDOCNR_REF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/GBT/S_MDIT_NODE_STRUCT-MDOCNR_REF.
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_/GBT/S_MDIT_NODE_STRUCT_STR, 
OBJ_GUID TYPE STRING,
MDOCNR TYPE STRING,
MDOCYR TYPE STRING,
MDOCIT TYPE STRING,
LOGSYS TYPE STRING,
MAT_DESCR TYPE STRING,
PRODUCT_GUID TYPE STRING,
INSERTED_AT TYPE STRING,
MODIFIED_AT TYPE STRING,
CREATED_DATE TYPE STRING,
CREATED_TIME TYPE STRING,
CREATED_BY TYPE STRING,
CHANGED_DATE TYPE STRING,
CHANGED_TIME TYPE STRING,
CHANGED_BY TYPE STRING,
PSTNG_DATE TYPE STRING,
MOVE_TYPE TYPE STRING,
PLANT TYPE STRING,
STGE_LOC TYPE STRING,
MATNR TYPE STRING,
BATNR TYPE STRING,
QUANTITY TYPE STRING,
BASE_UOM TYPE STRING,
DB_CR_IND TYPE STRING,
VAL_TYPE TYPE STRING,
REVERS_MVT TYPE STRING,
MVT_IND TYPE STRING,
RECEIPT_IND TYPE STRING,
CONSUMPT_IND TYPE STRING,
COMP_CODE TYPE STRING,
STOCK_TYPE TYPE STRING,
SPEC_STOCK TYPE STRING,
RESTRICT_STATUS TYPE STRING,
COSTCENTER TYPE STRING,
MDOCYR_REF TYPE STRING,
MDOCNR_REF TYPE STRING,
MDOCIT_REF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/GBT/S_MDIT_NODE_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_/GBT/S_MDIT_NODE_STRUCT_STR-OBJ_GUID sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-MDOCNR sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-MDOCYR sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-MDOCIT sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-LOGSYS sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-MAT_DESCR sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-PRODUCT_GUID sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-INSERTED_AT sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-MODIFIED_AT sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-CREATED_DATE sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-CREATED_TIME sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-CREATED_BY sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-CHANGED_DATE sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-CHANGED_TIME sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-CHANGED_BY sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-PSTNG_DATE sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-MOVE_TYPE sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-PLANT sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-STGE_LOC sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-MATNR sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-BATNR sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-QUANTITY sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-BASE_UOM sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-DB_CR_IND sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-VAL_TYPE sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-REVERS_MVT sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-MVT_IND sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-RECEIPT_IND sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-CONSUMPT_IND sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-COMP_CODE sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-STOCK_TYPE sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-SPEC_STOCK sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-RESTRICT_STATUS sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-COSTCENTER sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-MDOCYR_REF sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-MDOCNR_REF sy-vline 
WA_/GBT/S_MDIT_NODE_STRUCT_STR-MDOCIT_REF sy-vline      INTO ld_text SEPARATED BY SPACE.

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