ABAP Select data from SAP table MBCHGDOC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MBCHGDOC
*  INTO TABLE @DATA(IT_MBCHGDOC2).
*--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_MBCHGDOC INDEX 1 INTO DATA(WA_MBCHGDOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MBCHGDOC>-CHDOC = 1.
<MBCHGDOC>-LINE = 1.
<MBCHGDOC>-POSNR = 1.
<MBCHGDOC>-DOCCH = 1.
<MBCHGDOC>-CUSER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MBCHGDOC-CDATE, sy-vline,
  WA_MBCHGDOC-CTIME, sy-vline,
  WA_MBCHGDOC-CTCODE, sy-vline,
  WA_MBCHGDOC-COLD, sy-vline,
  WA_MBCHGDOC-CNEW, sy-vline,
  WA_MBCHGDOC-TNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MBCHGDOC 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_MBCHGDOC 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_MBCHGDOC INTO WA_MBCHGDOC.


*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_MBCHGDOC_STR, 
CHDOC TYPE STRING,
LINE TYPE STRING,
POSNR TYPE STRING,
DOCCH TYPE STRING,
CUSER TYPE STRING,
CDATE TYPE STRING,
CTIME TYPE STRING,
CTCODE TYPE STRING,
COLD TYPE STRING,
CNEW TYPE STRING,
TNAME TYPE STRING,
FNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MBCHGDOC_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_MBCHGDOC_STR-CHDOC sy-vline 
WA_MBCHGDOC_STR-LINE sy-vline 
WA_MBCHGDOC_STR-POSNR sy-vline 
WA_MBCHGDOC_STR-DOCCH sy-vline 
WA_MBCHGDOC_STR-CUSER sy-vline 
WA_MBCHGDOC_STR-CDATE sy-vline 
WA_MBCHGDOC_STR-CTIME sy-vline 
WA_MBCHGDOC_STR-CTCODE sy-vline 
WA_MBCHGDOC_STR-COLD sy-vline 
WA_MBCHGDOC_STR-CNEW sy-vline 
WA_MBCHGDOC_STR-TNAME sy-vline 
WA_MBCHGDOC_STR-FNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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