ABAP Select data from SAP table GENFMS_DTPOST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GENFMS_DTPOST
*  INTO TABLE @DATA(IT_GENFMS_DTPOST2).
*--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_GENFMS_DTPOST INDEX 1 INTO DATA(WA_GENFMS_DTPOST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GENFMS_DTPOST>-RLDNR = 1.
<GENFMS_DTPOST>-RYEAR = 1.
<GENFMS_DTPOST>-RBUKRS = 1.
<GENFMS_DTPOST>-RWRTTP = 1.
<GENFMS_DTPOST>-FDCT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GENFMS_DTPOST-CMIT, sy-vline,
  WA_GENFMS_DTPOST-FUND, sy-vline,
  WA_GENFMS_DTPOST-FNAR, sy-vline,
  WA_GENFMS_DTPOST-FDPR, sy-vline,
  WA_GENFMS_DTPOST-AMLT, sy-vline,
  WA_GENFMS_DTPOST-LCURR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GENFMS_DTPOST 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_GENFMS_DTPOST 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_GENFMS_DTPOST INTO WA_GENFMS_DTPOST.


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

*Conversion exit GJAHR, internal->external for field RYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_GENFMS_DTPOST-RYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GENFMS_DTPOST-RYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit FMCIL, internal->external for field CMIT
CALL FUNCTION 'CONVERSION_EXIT_FMCIL_OUTPUT'
  EXPORTING
    input =                      WA_GENFMS_DTPOST-CMIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GENFMS_DTPOST-CMIT.
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_GENFMS_DTPOST_STR, 
RLDNR TYPE STRING,
RYEAR TYPE STRING,
RBUKRS TYPE STRING,
RWRTTP TYPE STRING,
FDCT TYPE STRING,
CMIT TYPE STRING,
FUND TYPE STRING,
FNAR TYPE STRING,
FDPR TYPE STRING,
AMLT TYPE STRING,
LCURR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GENFMS_DTPOST_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_GENFMS_DTPOST_STR-RLDNR sy-vline 
WA_GENFMS_DTPOST_STR-RYEAR sy-vline 
WA_GENFMS_DTPOST_STR-RBUKRS sy-vline 
WA_GENFMS_DTPOST_STR-RWRTTP sy-vline 
WA_GENFMS_DTPOST_STR-FDCT sy-vline 
WA_GENFMS_DTPOST_STR-CMIT sy-vline 
WA_GENFMS_DTPOST_STR-FUND sy-vline 
WA_GENFMS_DTPOST_STR-FNAR sy-vline 
WA_GENFMS_DTPOST_STR-FDPR sy-vline 
WA_GENFMS_DTPOST_STR-AMLT sy-vline 
WA_GENFMS_DTPOST_STR-LCURR sy-vline      INTO ld_text SEPARATED BY SPACE.

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