ABAP Select data from SAP table DIINET into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DIINET
*  INTO TABLE @DATA(IT_DIINET2).
*--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_DIINET INDEX 1 INTO DATA(WA_DIINET2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DIINET>-MANDT = 1.
<DIINET>-KANTE = 1.
<DIINET>-MLANG = 1.
<DIINET>-NETID = 1.
<DIINET>-KANTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DIINET-TPVON, sy-vline,
  WA_DIINET-EQVON, sy-vline,
  WA_DIINET-TPNACH, sy-vline,
  WA_DIINET-EQNACH, sy-vline,
  WA_DIINET-LFDKNR, sy-vline,
  WA_DIINET-DATVA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DIINET 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_DIINET 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_DIINET INTO WA_DIINET.


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

*Conversion exit ISOLA, internal->external for field MLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DIINET-MLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIINET-MLANG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field TPVON
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_DIINET-TPVON
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIINET-TPVON.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TPLNR, internal->external for field TPNACH
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_DIINET-TPNACH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIINET-TPNACH.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TPLNR, internal->external for field TPKANT
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_DIINET-TPKANT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIINET-TPKANT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_DIINET-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIINET-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DIINET-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIINET-SPRAS.
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_DIINET_STR, 
MANDT TYPE STRING,
KANTE TYPE STRING,
MLANG TYPE STRING,
NETID TYPE STRING,
KANTYP TYPE STRING,
TPVON TYPE STRING,
EQVON TYPE STRING,
TPNACH TYPE STRING,
EQNACH TYPE STRING,
LFDKNR TYPE STRING,
DATVA TYPE STRING,
ZEITVA TYPE STRING,
DATVB TYPE STRING,
ZEITVB TYPE STRING,
STATUS TYPE STRING,
TPKANT TYPE STRING,
EQKANT TYPE STRING,
MEDIU TYPE STRING,
BEZARP TYPE STRING,
BEZARL TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
BEGRU TYPE STRING,
LVORM TYPE STRING,
NETYP TYPE STRING,
MATNR TYPE STRING,
SPRAS TYPE STRING,
KANXT TYPE STRING,
KZLTX TYPE STRING,
STATXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DIINET_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_DIINET_STR-MANDT sy-vline 
WA_DIINET_STR-KANTE sy-vline 
WA_DIINET_STR-MLANG sy-vline 
WA_DIINET_STR-NETID sy-vline 
WA_DIINET_STR-KANTYP sy-vline 
WA_DIINET_STR-TPVON sy-vline 
WA_DIINET_STR-EQVON sy-vline 
WA_DIINET_STR-TPNACH sy-vline 
WA_DIINET_STR-EQNACH sy-vline 
WA_DIINET_STR-LFDKNR sy-vline 
WA_DIINET_STR-DATVA sy-vline 
WA_DIINET_STR-ZEITVA sy-vline 
WA_DIINET_STR-DATVB sy-vline 
WA_DIINET_STR-ZEITVB sy-vline 
WA_DIINET_STR-STATUS sy-vline 
WA_DIINET_STR-TPKANT sy-vline 
WA_DIINET_STR-EQKANT sy-vline 
WA_DIINET_STR-MEDIU sy-vline 
WA_DIINET_STR-BEZARP sy-vline 
WA_DIINET_STR-BEZARL sy-vline 
WA_DIINET_STR-ERDAT sy-vline 
WA_DIINET_STR-ERNAM sy-vline 
WA_DIINET_STR-AEDAT sy-vline 
WA_DIINET_STR-AENAM sy-vline 
WA_DIINET_STR-BEGRU sy-vline 
WA_DIINET_STR-LVORM sy-vline 
WA_DIINET_STR-NETYP sy-vline 
WA_DIINET_STR-MATNR sy-vline 
WA_DIINET_STR-SPRAS sy-vline 
WA_DIINET_STR-KANXT sy-vline 
WA_DIINET_STR-KZLTX sy-vline 
WA_DIINET_STR-STATXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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