ABAP Select data from SAP table DCSHFDCHG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DCSHFDCHG
*  INTO TABLE @DATA(IT_DCSHFDCHG2).
*--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_DCSHFDCHG INDEX 1 INTO DATA(WA_DCSHFDCHG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DCSHFDCHG>-SHLPNAME = 1.
<DCSHFDCHG>-FIELDNAME = 1.
<DCSHFDCHG>-FIELDDEL = 1.
<DCSHFDCHG>-FIELDADD = 1.
<DCSHFDCHG>-DTELCHG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DCSHFDCHG-DTELDST, sy-vline,
  WA_DCSHFDCHG-DDTYPECHG, sy-vline,
  WA_DCSHFDCHG-DDTYPEDST, sy-vline,
  WA_DCSHFDCHG-DDLENGCHG, sy-vline,
  WA_DCSHFDCHG-DDLENGDST, sy-vline,
  WA_DCSHFDCHG-DDDECCHG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DCSHFDCHG 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_DCSHFDCHG 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_DCSHFDCHG INTO WA_DCSHFDCHG.


*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 DTYPE, internal->external for field DDTYPEDST
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_DCSHFDCHG-DDTYPEDST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DCSHFDCHG-DDTYPEDST.
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_DCSHFDCHG_STR, 
SHLPNAME TYPE STRING,
FIELDNAME TYPE STRING,
FIELDDEL TYPE STRING,
FIELDADD TYPE STRING,
DTELCHG TYPE STRING,
DTELDST TYPE STRING,
DDTYPECHG TYPE STRING,
DDTYPEDST TYPE STRING,
DDLENGCHG TYPE STRING,
DDLENGDST TYPE STRING,
DDDECCHG TYPE STRING,
DDDECDST TYPE STRING,
INPUTCHG TYPE STRING,
OUTPUTCHG TYPE STRING,
DEFAULTCHG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DCSHFDCHG_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_DCSHFDCHG_STR-SHLPNAME sy-vline 
WA_DCSHFDCHG_STR-FIELDNAME sy-vline 
WA_DCSHFDCHG_STR-FIELDDEL sy-vline 
WA_DCSHFDCHG_STR-FIELDADD sy-vline 
WA_DCSHFDCHG_STR-DTELCHG sy-vline 
WA_DCSHFDCHG_STR-DTELDST sy-vline 
WA_DCSHFDCHG_STR-DDTYPECHG sy-vline 
WA_DCSHFDCHG_STR-DDTYPEDST sy-vline 
WA_DCSHFDCHG_STR-DDLENGCHG sy-vline 
WA_DCSHFDCHG_STR-DDLENGDST sy-vline 
WA_DCSHFDCHG_STR-DDDECCHG sy-vline 
WA_DCSHFDCHG_STR-DDDECDST sy-vline 
WA_DCSHFDCHG_STR-INPUTCHG sy-vline 
WA_DCSHFDCHG_STR-OUTPUTCHG sy-vline 
WA_DCSHFDCHG_STR-DEFAULTCHG sy-vline      INTO ld_text SEPARATED BY SPACE.

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