ABAP Select data from SAP table FMDOCHEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FMDOCHEADER
*  INTO TABLE @DATA(IT_FMDOCHEADER2).
*--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_FMDOCHEADER INDEX 1 INTO DATA(WA_FMDOCHEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FMDOCHEADER>-FM_AREA = 1.
<FMDOCHEADER>-VERSION = 1.
<FMDOCHEADER>-OVERALL = 1.
<FMDOCHEADER>-AUTORELEASE = 1.
<FMDOCHEADER>-RESPONSIBLE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FMDOCHEADER-RPUBLAW, sy-vline,
  WA_FMDOCHEADER-RLEGIS, sy-vline,
  WA_FMDOCHEADER-RCOHORT, sy-vline,
  WA_FMDOCHEADER-DOCTYPE, sy-vline,
  WA_FMDOCHEADER-AWTYP, sy-vline,
  WA_FMDOCHEADER-AWREF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FMDOCHEADER 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_FMDOCHEADER 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_FMDOCHEADER INTO WA_FMDOCHEADER.


*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 VERSION
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FMDOCHEADER-VERSION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMDOCHEADER-VERSION.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field AWSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FMDOCHEADER-AWSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMDOCHEADER-AWSYS.
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_FMDOCHEADER_STR, 
FM_AREA TYPE STRING,
VERSION TYPE STRING,
OVERALL TYPE STRING,
AUTORELEASE TYPE STRING,
RESPONSIBLE TYPE STRING,
RPUBLAW TYPE STRING,
RLEGIS TYPE STRING,
RCOHORT TYPE STRING,
DOCTYPE TYPE STRING,
AWTYP TYPE STRING,
AWREF TYPE STRING,
AWORG TYPE STRING,
AWSYS TYPE STRING,
VALUE_DATE TYPE STRING,
DOC_DATE TYPE STRING,
POSTING_DATE TYPE STRING,
POSTING_PERIOD TYPE STRING,
DOC_TEXT TYPE STRING,
TEXT_NAME TYPE STRING,
TRANS_CURR TYPE STRING,
VALKEY TYPE STRING,
SRC_BELNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FMDOCHEADER_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_FMDOCHEADER_STR-FM_AREA sy-vline 
WA_FMDOCHEADER_STR-VERSION sy-vline 
WA_FMDOCHEADER_STR-OVERALL sy-vline 
WA_FMDOCHEADER_STR-AUTORELEASE sy-vline 
WA_FMDOCHEADER_STR-RESPONSIBLE sy-vline 
WA_FMDOCHEADER_STR-RPUBLAW sy-vline 
WA_FMDOCHEADER_STR-RLEGIS sy-vline 
WA_FMDOCHEADER_STR-RCOHORT sy-vline 
WA_FMDOCHEADER_STR-DOCTYPE sy-vline 
WA_FMDOCHEADER_STR-AWTYP sy-vline 
WA_FMDOCHEADER_STR-AWREF sy-vline 
WA_FMDOCHEADER_STR-AWORG sy-vline 
WA_FMDOCHEADER_STR-AWSYS sy-vline 
WA_FMDOCHEADER_STR-VALUE_DATE sy-vline 
WA_FMDOCHEADER_STR-DOC_DATE sy-vline 
WA_FMDOCHEADER_STR-POSTING_DATE sy-vline 
WA_FMDOCHEADER_STR-POSTING_PERIOD sy-vline 
WA_FMDOCHEADER_STR-DOC_TEXT sy-vline 
WA_FMDOCHEADER_STR-TEXT_NAME sy-vline 
WA_FMDOCHEADER_STR-TRANS_CURR sy-vline 
WA_FMDOCHEADER_STR-VALKEY sy-vline 
WA_FMDOCHEADER_STR-SRC_BELNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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