ABAP Select data from SAP table DIAFAB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DIAFAB
*  INTO TABLE @DATA(IT_DIAFAB2).
*--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_DIAFAB INDEX 1 INTO DATA(WA_DIAFAB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DIAFAB>-MANDT = 1.
<DIAFAB>-AUFPL_VOR = 1.
<DIAFAB>-APLZL_VOR = 1.
<DIAFAB>-AUFPL_NCH = 1.
<DIAFAB>-APLZL_NCH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DIAFAB-AOBAR, sy-vline,
  WA_DIAFAB-MIMAX, sy-vline,
  WA_DIAFAB-OBJNR, sy-vline,
  WA_DIAFAB-ZEINH, sy-vline,
  WA_DIAFAB-DAUER, sy-vline,
  WA_DIAFAB-DAUKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DIAFAB 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_DIAFAB 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_DIAFAB INTO WA_DIAFAB.


*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 AOBAR, internal->external for field AOBAR
CALL FUNCTION 'CONVERSION_EXIT_AOBAR_OUTPUT'
  EXPORTING
    input =                      WA_DIAFAB-AOBAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIAFAB-AOBAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ZEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_DIAFAB-ZEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIAFAB-ZEINH.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_DIAFAB-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIAFAB-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORN1
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_DIAFAB-VORN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIAFAB-VORN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORN2
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_DIAFAB-VORN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIAFAB-VORN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AUFNR, internal->external for field NETZPLAN
CALL FUNCTION 'CONVERSION_EXIT_AUFNR_OUTPUT'
  EXPORTING
    input =                      WA_DIAFAB-NETZPLAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIAFAB-NETZPLAN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AUFNR, internal->external for field NETZPL_VOR
CALL FUNCTION 'CONVERSION_EXIT_AUFNR_OUTPUT'
  EXPORTING
    input =                      WA_DIAFAB-NETZPL_VOR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIAFAB-NETZPL_VOR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AUFNR, internal->external for field NETZPL_NCH
CALL FUNCTION 'CONVERSION_EXIT_AUFNR_OUTPUT'
  EXPORTING
    input =                      WA_DIAFAB-NETZPL_NCH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIAFAB-NETZPL_NCH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORG_DUMY1
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_DIAFAB-VORG_DUMY1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIAFAB-VORG_DUMY1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORG_DUMY2
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_DIAFAB-VORG_DUMY2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIAFAB-VORG_DUMY2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORG_DUMY3
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_DIAFAB-VORG_DUMY3
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIAFAB-VORG_DUMY3.
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_DIAFAB_STR, 
MANDT TYPE STRING,
AUFPL_VOR TYPE STRING,
APLZL_VOR TYPE STRING,
AUFPL_NCH TYPE STRING,
APLZL_NCH TYPE STRING,
AOBAR TYPE STRING,
MIMAX TYPE STRING,
OBJNR TYPE STRING,
ZEINH TYPE STRING,
DAUER TYPE STRING,
DAUKZ TYPE STRING,
VORNC TYPE STRING,
NCVOR TYPE STRING,
LOEKZ TYPE STRING,
KALID TYPE STRING,
PRZNT TYPE STRING,
PROVG TYPE STRING,
ARBID TYPE STRING,
WERKS TYPE STRING,
FSABD TYPE STRING,
FSABZ TYPE STRING,
SSABD TYPE STRING,
SSABZ TYPE STRING,
FEABD TYPE STRING,
FEABZ TYPE STRING,
SEABD TYPE STRING,
SEABZ TYPE STRING,
DAUTM TYPE STRING,
AUCRE TYPE STRING,
DAUERMAX TYPE STRING,
AENNR TYPE STRING,
VORNR TYPE STRING,
LTXA1 TYPE STRING,
NCHKZ TYPE STRING,
VORN1 TYPE STRING,
LTXN1 TYPE STRING,
VORN2 TYPE STRING,
LTXN2 TYPE STRING,
KTXN1 TYPE STRING,
KTXN2 TYPE STRING,
AOBTX TYPE STRING,
KALTX TYPE STRING,
NETZPLAN TYPE STRING,
NETZPL_VOR TYPE STRING,
NETZPL_NCH TYPE STRING,
VORG_DUMY1 TYPE STRING,
VORG_DUMY2 TYPE STRING,
VORG_DUMY3 TYPE STRING,
INDBT TYPE STRING,
ARBPL TYPE STRING,
FLG_LOCK TYPE STRING,
INDBT_VOR1 TYPE STRING,
INDBT_VOR2 TYPE STRING,
VSNMR TYPE STRING,
INACT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DIAFAB_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_DIAFAB_STR-MANDT sy-vline 
WA_DIAFAB_STR-AUFPL_VOR sy-vline 
WA_DIAFAB_STR-APLZL_VOR sy-vline 
WA_DIAFAB_STR-AUFPL_NCH sy-vline 
WA_DIAFAB_STR-APLZL_NCH sy-vline 
WA_DIAFAB_STR-AOBAR sy-vline 
WA_DIAFAB_STR-MIMAX sy-vline 
WA_DIAFAB_STR-OBJNR sy-vline 
WA_DIAFAB_STR-ZEINH sy-vline 
WA_DIAFAB_STR-DAUER sy-vline 
WA_DIAFAB_STR-DAUKZ sy-vline 
WA_DIAFAB_STR-VORNC sy-vline 
WA_DIAFAB_STR-NCVOR sy-vline 
WA_DIAFAB_STR-LOEKZ sy-vline 
WA_DIAFAB_STR-KALID sy-vline 
WA_DIAFAB_STR-PRZNT sy-vline 
WA_DIAFAB_STR-PROVG sy-vline 
WA_DIAFAB_STR-ARBID sy-vline 
WA_DIAFAB_STR-WERKS sy-vline 
WA_DIAFAB_STR-FSABD sy-vline 
WA_DIAFAB_STR-FSABZ sy-vline 
WA_DIAFAB_STR-SSABD sy-vline 
WA_DIAFAB_STR-SSABZ sy-vline 
WA_DIAFAB_STR-FEABD sy-vline 
WA_DIAFAB_STR-FEABZ sy-vline 
WA_DIAFAB_STR-SEABD sy-vline 
WA_DIAFAB_STR-SEABZ sy-vline 
WA_DIAFAB_STR-DAUTM sy-vline 
WA_DIAFAB_STR-AUCRE sy-vline 
WA_DIAFAB_STR-DAUERMAX sy-vline 
WA_DIAFAB_STR-AENNR sy-vline 
WA_DIAFAB_STR-VORNR sy-vline 
WA_DIAFAB_STR-LTXA1 sy-vline 
WA_DIAFAB_STR-NCHKZ sy-vline 
WA_DIAFAB_STR-VORN1 sy-vline 
WA_DIAFAB_STR-LTXN1 sy-vline 
WA_DIAFAB_STR-VORN2 sy-vline 
WA_DIAFAB_STR-LTXN2 sy-vline 
WA_DIAFAB_STR-KTXN1 sy-vline 
WA_DIAFAB_STR-KTXN2 sy-vline 
WA_DIAFAB_STR-AOBTX sy-vline 
WA_DIAFAB_STR-KALTX sy-vline 
WA_DIAFAB_STR-NETZPLAN sy-vline 
WA_DIAFAB_STR-NETZPL_VOR sy-vline 
WA_DIAFAB_STR-NETZPL_NCH sy-vline 
WA_DIAFAB_STR-VORG_DUMY1 sy-vline 
WA_DIAFAB_STR-VORG_DUMY2 sy-vline 
WA_DIAFAB_STR-VORG_DUMY3 sy-vline 
WA_DIAFAB_STR-INDBT sy-vline 
WA_DIAFAB_STR-ARBPL sy-vline 
WA_DIAFAB_STR-FLG_LOCK sy-vline 
WA_DIAFAB_STR-INDBT_VOR1 sy-vline 
WA_DIAFAB_STR-INDBT_VOR2 sy-vline 
WA_DIAFAB_STR-VSNMR sy-vline 
WA_DIAFAB_STR-INACT sy-vline      INTO ld_text SEPARATED BY SPACE.

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