ABAP Select data from SAP table IDOCSYN into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP IDOCSYN 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 IDOCSYN. 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 IDOCSYN 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_IDOCSYN TYPE STANDARD TABLE OF IDOCSYN,
      WA_IDOCSYN TYPE IDOCSYN,
      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: <IDOCSYN> TYPE IDOCSYN.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IDOCSYN
*  INTO TABLE @DATA(IT_IDOCSYN2).
*--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_IDOCSYN INDEX 1 INTO DATA(WA_IDOCSYN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IDOCSYN>-IDOCTYP = 1.
<IDOCSYN>-NR = 1.
<IDOCSYN>-SEGTYP = 1.
<IDOCSYN>-PARSEG = 1.
<IDOCSYN>-PARPNO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IDOCSYN-PARFLG, sy-vline,
  WA_IDOCSYN-MUSTFL, sy-vline,
  WA_IDOCSYN-OCCMIN, sy-vline,
  WA_IDOCSYN-OCCMAX, sy-vline,
  WA_IDOCSYN-HLEVEL, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_IDOCSYN 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_IDOCSYN 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_IDOCSYN INTO WA_IDOCSYN.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_IDOCSYN_STR, 
IDOCTYP TYPE STRING,
NR TYPE STRING,
SEGTYP TYPE STRING,
PARSEG TYPE STRING,
PARPNO TYPE STRING,
PARFLG TYPE STRING,
MUSTFL TYPE STRING,
OCCMIN TYPE STRING,
OCCMAX TYPE STRING,
HLEVEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IDOCSYN_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_IDOCSYN_STR-IDOCTYP sy-vline 
WA_IDOCSYN_STR-NR sy-vline 
WA_IDOCSYN_STR-SEGTYP sy-vline 
WA_IDOCSYN_STR-PARSEG sy-vline 
WA_IDOCSYN_STR-PARPNO sy-vline 
WA_IDOCSYN_STR-PARFLG sy-vline 
WA_IDOCSYN_STR-MUSTFL sy-vline 
WA_IDOCSYN_STR-OCCMIN sy-vline 
WA_IDOCSYN_STR-OCCMAX sy-vline 
WA_IDOCSYN_STR-HLEVEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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